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Ken Coit July 13th 03 12:03 AM

Which engine would you prefer??
 
Presuming you were looking to buy a used boat, which engine would you rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC



Over40pirate July 13th 03 02:45 AM

Which engine would you prefer??
 
4-108 for sure

Socalsail July 13th 03 03:37 AM

Which engine would you prefer??
 
We just finished puttind back in our 4-108 after rebuilding. I am happy with
the engine but. If we would have been able to afford it(twice what the rebuild
cost) I would of gone withe the BETA. Not the 35hp, thats too small for us,
but the 42 would have been perfect. Their job of marinizing the Kubota is top
notch. Love the Perkins but, It would be nice to have a more modern, quieter,
simpler engine. That said the new Perkins runs great.
Mike
sv slacker

Keith July 13th 03 01:51 PM

Which engine would you prefer??
 
Perkins. Forget those high rpm Yanmars...

--


Keith
__
If you love something, let it go free. If it doesn't come back, hunt it down
and kill it.
"Ken Coit" wrote in message
. com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC





Joe Wood July 13th 03 04:42 PM

Which engine would you prefer??
 
The only hit that I know of about the 4-108 is that the operator's
manual introduction for bleeding the fuel system starts out with "For
the operator who is unfortunate enough to run out of fuel," and ends up
with "If this doesn't work, call for professional help...You do have a
working radio and did remember to pack some flares, didn't you?"

It's a real dog to bleed.

Joe Wood

Ken Coit wrote:
Presuming you were looking to buy a used boat, which engine would you rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC




Over40pirate July 13th 03 08:46 PM

Which engine would you prefer??
 
Lower rpm = longer life
Higher rpm = shorter life

The Perkins 4-107 in my sailboat takes less than 10 minutes to bleed.
The electric fuel pump between the tank and Raycor filter make it easier to
bleed. I leave the pump turned off except for bleeding.
As a bonus, if the fuel filter gets clogged, enough to cause the engine rpm to
fluctuate, you can turn the elec pump on, and restore adequate fuel pressure.
Before replacing a rusted fuel tank, the filter would get clogged and cause
problems. When motoring into the wind going out an inlet, I would turn the pump
on as insurance. Now with a new tank, I just use it for bleeding.
Don't let the feer of bleeding a Perkins influence the choice.
"Run it slow, run it long"

Ron Thornton July 13th 03 11:53 PM

Which engine would you prefer??
 
I put an electric fuel pump on my 4-108. It's the pulse type that
allows fuel to be pulled thru it when it is off. To bleed I turn on the
pump, crack two or three fittings and I'm on my way.

Ron


Bob Schneider July 14th 03 02:21 AM

Which engine would you prefer??
 
In the process of purchasing a 34' sailboat with a Volvo 30HP engine. Have
heard "not good" things about the Volvo. This one has 1900 hours and looks
to be in good shape, but have not seatrialed yet. What specific problem
areas should I look out for and what problems in the future should I expect?

Regards,
Bob





"Leanne" wrote in message
...

"Ken Coit" wrote in message
. com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E


I would go with the Perkins, but if I had to buy new, I would like the

Yanmar.
I was on a boat for 5 years that had the Perkins. My own boat, I tossed a

Volvo
and replaced it with the 3GM Yanmar. Kubota is a good engine also.

Leanne
s/v Fundy





Leanne July 14th 03 03:02 AM

Which engine would you prefer??
 

"Bob Schneider" wrote in message
nk.net...
In the process of purchasing a 34' sailboat with a Volvo 30HP engine. Have
heard "not good" things about the Volvo. This one has 1900 hours and looks
to be in good shape, but have not seatrialed yet. What specific problem
areas should I look out for and what problems in the future should I expect?


My Volvo had close to 2000 hours before changing it out.. Twice in the previous
two years, it filled the lower end with salt water. I found that in rebuilding
it, the parts were made out of gold. It was a MD-11D and in ordering parts like
gasket sets, you had to order for each cylinder. Head gaskets alone were between
75-80 dollars. The water jacket/exhaust manifold was going to be over 500 if
they could find one. That was the reason for going to the 3GM30, besides having
a more modern engine, I have one that is very much quieter. I still have the
MS-7 transmission, Panel w/wiring harness, and the engine. I guess that most of
it is reusable if someone wanted it. The cylinders are also the same for the
MD-17 and probably the MD-5.

Leanne
s/v Fundy



Ken Coit July 14th 03 03:43 AM

Keep those views coming!
 
I am surprised by the nearly single-mindedness here for Perkins and not a
mention of the Yanmar. In other venues I've been hearing negative and
positive views on the Beta products; some think the Yanmar vibrates and is
too noisy, but there have been no complaints about reliability or
suitability for the service.

Thanks everyone.

Ken
S/V Parfait
Raleigh, NC


"Ken Coit" wrote in message
. com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC





Brian Whatcott July 14th 03 05:01 AM

Which engine would you prefer??
 
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....

Brian Whatcott Altus OK

On Mon, 14 Jul 2003 01:21:55 GMT, "Bob Schneider"
wrote:

In the process of purchasing a 34' sailboat with a Volvo 30HP engine. Have
heard "not good" things about the Volvo. This one has 1900 hours and looks
to be in good shape, but have not seatrialed yet. What specific problem
areas should I look out for and what problems in the future should I expect?

Regards,
Bob





"Leanne" wrote in message
...

"Ken Coit" wrote in message
. com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E


I would go with the Perkins, but if I had to buy new, I would like the

Yanmar.
I was on a boat for 5 years that had the Perkins. My own boat, I tossed a

Volvo
and replaced it with the 3GM Yanmar. Kubota is a good engine also.

Leanne
s/v Fundy





Over40pirate July 14th 03 05:47 AM

Which engine would you prefer??
 
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....


1900 hrs. on a diesel and it needs a reuild? You sure aren't talking about a
Perkins.

Jim Woodward July 14th 03 10:04 PM

Which engine would you prefer??
 
I have lived with the 4-108 for about ten years (twenty years ago) and
took the Yanmar's big brother, a 4JH, around the world in our Swan 57,
Swee****er. I'd pick the Yanmar in a second.

Among other things, a 3 cylinder has inherently less vibration than a
4. (In a three, the pistons are 120 degrees apart, while in a four,
they are 90 degrees apart, so that when one hits top dead center, its
mate is at bottom dead center.)

Jim Woodward
www.mvfintry.com


"Ken Coit" wrote in message .com...
Presuming you were looking to buy a used boat, which engine would you rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC


Brian Whatcott July 14th 03 11:47 PM

Which engine would you prefer??
 
Hmmm 4 cyl vs 3 cyl: better take a look at this...

http://autozine.kyul.net/technical_school/engine/smooth1.htm

Regards

Brian Whatcott altus OK


On 14 Jul 2003 14:04:33 -0700, (Jim Woodward)
wrote:

I have lived with the 4-108 for about ten years (twenty years ago) and
took the Yanmar's big brother, a 4JH, around the world in our Swan 57,
Swee****er. I'd pick the Yanmar in a second.

Among other things, a 3 cylinder has inherently less vibration than a
4. (In a three, the pistons are 120 degrees apart, while in a four,
they are 90 degrees apart, so that when one hits top dead center, its
mate is at bottom dead center.)

Jim Woodward
www.mvfintry.com


"Ken Coit" wrote in message .com...
Presuming you were looking to buy a used boat, which engine would you rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC



Steven Shelikoff July 15th 03 12:56 AM

Which engine would you prefer??
 
On Sun, 13 Jul 2003 11:42:06 -0400, Joe Wood wrote:

The only hit that I know of about the 4-108 is that the operator's
manual introduction for bleeding the fuel system starts out with "For
the operator who is unfortunate enough to run out of fuel," and ends up
with "If this doesn't work, call for professional help...You do have a
working radio and did remember to pack some flares, didn't you?"

It's a real dog to bleed.


Not being personally familiar with the other choices, all I can say is
I've had a 4-108 for the last 5 years and it's been bulletproof.

It's never taken me more then 15 minutes to bleed mine, and that was the
first time I did it. Now that I have it down to more of a "science" and
can do it in under 10 minutes. And now that I've installed an electric
pump on it, I can bleed it in around 5 minutes.

Steve

Peter Wiley July 16th 03 08:12 AM

Which engine would you prefer??
 
Brian Whatcott wrote in message . ..
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....


Funny, my Perkins 4 cyl diesel has over 2500 hours on it and runs
perfectly. It was made back in 1965 (no, I don't use it much).

Right, I forgot - it's in my tractor. Seems an engine changes when
it's in a boat. Or perhaps it's the lack of maintenance.

Any well maintained diesel fed clean air & fuel, run under proper
load, should last pretty much forever. 2000 hours is nothing.

Peter Wiley

Jim B July 16th 03 09:13 AM

Which engine would you prefer??
 

"Peter Wiley" wrote in message
om...
Brian Whatcott wrote in message

. ..
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....


Funny, my Perkins 4 cyl diesel has over 2500 hours on it and runs
perfectly. It was made back in 1965 (no, I don't use it much).

Right, I forgot - it's in my tractor. Seems an engine changes when
it's in a boat. Or perhaps it's the lack of maintenance.

Any well maintained diesel fed clean air & fuel, run under proper
load, should last pretty much forever. 2000 hours is nothing.

Peter Wiley


My 1987 Perkins 4.108 is still going strong at 5,250 hours. It's had new
crankshaft oil seals at both ends at 3,500 hours, 100 hour oil changes all
its life. It's starting to rattle a little, but still gives good power
shoving 10 tons along at 6kts with 2,500 rpm. It runs in a cramped, hot
little engine room with poor ventilation, and above 3,000 rpm (rated at
4,000 max, 3,500 for commercial use) rattles rather louder. Tappets are OK,
so I think the little ends are beginning to die.

So they don't run for ever, but 5,000 hours plus in an ill ventilated
cupboard isn't too bad.
--
Jim B, Yacht RAPAZ,
Summers in the Med, winters in UK
jim[dot]baerselman[at]ntlworld[dot]com







Dave Erickson July 16th 03 03:54 PM

Which engine would you prefer??
 
I installed a new Yanmar 3JH3E two years ago and just got back from a 5000
mile, one year trip to the Bahamas and back to Salem MA. We motored almost
all the way, down the ICW and back, early 1000 hours. Boat is an 1968 Apache
37 at 15000#. Prop is 17 X 12 three blade sailor.

The engine was great. Other than things I did to try and mess it up (flooded
four times due to faulty exhaust, fuel in the crankase due to incorrect fuel
line tightening) it performed flawlessly and tolerated my abuse. Quiet and
smooth enough, great mileage, nothing broke. Parts available everywhere.

Check the web page for details on the trip.

Dave Erickson
Apache 37 "Second Sojourn"
www.djerickson.com

To send email, remove the xx from my email address.






"Ken Coit" wrote in message
. com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC





brad July 16th 03 04:48 PM

Which engine would you prefer??
 
Brian Whatcott wrote in message . ..
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....

Brian Whatcott Altus OK

1900 hours time for a overhaul? I am not a mechanic, but I thought one
of the reasons one would go with a diesel is for its reliability. If I
had a piece of equipment that operated 8 hrs a day, 1900 hours would
be about 237 days of
operation . Most of the machinery ( diesel powered ) at my work
operates 24 hrs a day. The equipment does get a service ( oil and
filter change) every 250 hrs of operation. What a huge liability if
they had to overhaul every 1900 hours.

Brian Whatcott July 16th 03 07:12 PM

Which engine would you prefer??
 
On 16 Jul 2003 08:48:08 -0700, (brad) wrote:

Brian Whatcott wrote in message . ..
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....

Brian Whatcott Altus OK

1900 hours time for a overhaul? I am not a mechanic, but I thought one
of the reasons one would go with a diesel is for its reliability. If I
had a piece of equipment that operated 8 hrs a day, 1900 hours would
be about 237 days of
operation . Most of the machinery ( diesel powered ) at my work
operates 24 hrs a day. The equipment does get a service ( oil and
filter change) every 250 hrs of operation. What a huge liability if
they had to overhaul every 1900 hours.



It's pleasing to hear about long-life engines.
Used to be, recips used on light aircraft had a mandated overhaul time
- for most of them it was 2000 hours. Now its "on condition" like
jets....

Comparing auto engine lives:

You would like to make 150 thousand miles plus before tearing an auto
down (certainly we are making those numbers on a pair of econoboxes
we own.) If you averaged 40 mph long term - that would be 3750
hours.
But at the margins: the old carb fed auto engines sometimes gave up
after 100,000 miles (~2500 hours) of start/stop.

Around here, those same engines, fed LNG and with a little prep like
hard seats and valves and special rings etc., can go many seasons in
24/7 irrigation pump duty - more than 10,000 hours - and those aren't
diesels.

I personally wouldn't expect a 20 year old gas engine in a boat to
have done very many hours or to be up to much good, - but I could be
wrong.

Brian Whatcott Altus OK

Steven Shelikoff July 17th 03 12:13 AM

Which engine would you prefer??
 
On Wed, 16 Jul 2003 18:12:25 GMT, Brian Whatcott
wrote:

On 16 Jul 2003 08:48:08 -0700, (brad) wrote:

Brian Whatcott wrote in message . ..
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....

Brian Whatcott Altus OK

1900 hours time for a overhaul? I am not a mechanic, but I thought one
of the reasons one would go with a diesel is for its reliability. If I
had a piece of equipment that operated 8 hrs a day, 1900 hours would
be about 237 days of
operation . Most of the machinery ( diesel powered ) at my work
operates 24 hrs a day. The equipment does get a service ( oil and
filter change) every 250 hrs of operation. What a huge liability if
they had to overhaul every 1900 hours.



It's pleasing to hear about long-life engines.
Used to be, recips used on light aircraft had a mandated overhaul time
- for most of them it was 2000 hours. Now its "on condition" like
jets....

Comparing auto engine lives:

You would like to make 150 thousand miles plus before tearing an auto
down (certainly we are making those numbers on a pair of econoboxes
we own.) If you averaged 40 mph long term - that would be 3750
hours.


Yes, but if the auto engine spent a very high percentage of it's life
at, say, 80% max hp, you wouldn't be getting anywhere near those hours.
Cruising along at 55 mph, the average auto engine is probably only
operating at around 10% load.

Steve

Ken Coit July 17th 03 12:51 AM

Which engine would you prefer??
 
Jim,

Finally, a dissenter from the Perkins crowd. I have been quite surprised at
the loyal Perkins support here. It has about convinced me that we should
stick with her.

I have had others comment elsewhere that the Yanmar is the rough running
engine and I don't understand why a three cylinder engine running at roughly
20% faster for a given power output, could be quieter and smoother than a 4
cylinder engine at that same power level. This is especially true if the
4-banger has greater displacement and would be running at, say, 3000 RPM at
max continuous rating of 37 SHP when the 3 banger is running at 3650 RPM at
a similar power level.

Of course, we would normally run much slower, say 2500 on the Perkins and
3000 on the Yanmar, easily reaching hull speed in most conditions.

I'm not sure I understand why having pistons at opposite ends of their
throws simultaneously would increase the vibration, but then, dynamics was
never one of my favorite courses. If you have a quick explanation, I am all
ears.

Thanks for your reply, the quest is interesting to say the least.

Keep on sailing,

Ken
S/V Parfait
Raleigh, NC



"Jim Woodward" wrote in message
...
I have lived with the 4-108 for about ten years (twenty years ago) and
took the Yanmar's big brother, a 4JH, around the world in our Swan 57,
Swee****er. I'd pick the Yanmar in a second.

Among other things, a 3 cylinder has inherently less vibration than a
4. (In a three, the pistons are 120 degrees apart, while in a four,
they are 90 degrees apart, so that when one hits top dead center, its
mate is at bottom dead center.)

Jim Woodward
www.mvfintry.com


"Ken Coit" wrote in message

.com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull

speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC




Brian Whatcott July 17th 03 01:04 AM

Which engine would you prefer??
 
I'll try for an answer: the pistons are moving fastest not when the
crank is at ninety degrees to the vertical but with the crank a little
closer to cylinder - so the crank and con rod are at 90 degrees to
each other.
This has the effect of introducing a vibration at twice crank rotation
rate.

Brian Whatcott Altus OK

On Wed, 16 Jul 2003 23:51:01 GMT, "Ken Coit"
wrote:
//
I'm not sure I understand why having pistons at opposite ends of their
throws simultaneously would increase the vibration, but then, dynamics was
never one of my favorite courses. If you have a quick explanation, I am all
ears.

Thanks for your reply, the quest is interesting to say the least.

Keep on sailing,

Ken
S/V Parfait
Raleigh, NC


Ken Coit July 17th 03 01:28 AM

Which engine would you prefer??
 
Dave,

Thanks for the report. What reduction gear are you using and what is your
"cruising" RPM? The 17x12 seems like a large prop, I don't think I could
fit a 17 to Parfait without some surgery. She currently swings a 15R13
three-blade which is more than adequate.

Keep on sailing,

Ken
S/V Parfait
Raleigh, NC



"Dave Erickson" wrote in message
news:RGdRa.78327$ye4.52992@sccrnsc01...
I installed a new Yanmar 3JH3E two years ago and just got back from a 5000
mile, one year trip to the Bahamas and back to Salem MA. We motored almost
all the way, down the ICW and back, early 1000 hours. Boat is an 1968

Apache
37 at 15000#. Prop is 17 X 12 three blade sailor.

The engine was great. Other than things I did to try and mess it up

(flooded
four times due to faulty exhaust, fuel in the crankase due to incorrect

fuel
line tightening) it performed flawlessly and tolerated my abuse. Quiet and
smooth enough, great mileage, nothing broke. Parts available everywhere.

Check the web page for details on the trip.

Dave Erickson
Apache 37 "Second Sojourn"
www.djerickson.com

To send email, remove the xx from my email address.






"Ken Coit" wrote in message
. com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull

speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC







Brian Whatcott July 17th 03 03:24 AM

Which engine would you prefer??
 


Three cylinder 4 strokes have a rocking couple due to the power
strokes, 4 cylinder 4 strokes have a 2nd harmonic - and the latter is
said to be more smooth than the former for that reason

Brian W

On Thu, 17 Jul 2003 00:22:30 GMT, "Ken Coit"
wrote:

If I read Brian's references correctly, having opposed cylinders is good as
they are balanced. If 3 cylinder engines were smoother than 4, why wouldn't
most small engine manufacturers use them? Seems like Saab is the only one
in recent memory.

I'm no expert, but I think the 4 bangers are smoother for a given level of
output. I do wish the referenced article had addressed that question.

Keep on sailing,

Ken


"Jim Woodward" wrote in message
m...
I have lived with the 4-108 for about ten years (twenty years ago) and
took the Yanmar's big brother, a 4JH, around the world in our Swan 57,
Swee****er. I'd pick the Yanmar in a second.

Among other things, a 3 cylinder has inherently less vibration than a
4. (In a three, the pistons are 120 degrees apart, while in a four,
they are 90 degrees apart, so that when one hits top dead center, its
mate is at bottom dead center.)

Jim Woodward
www.mvfintry.com


"Ken Coit" wrote in message

r.com...
Presuming you were looking to buy a used boat, which engine would you

rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull

speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC




Lew Hodgett July 17th 03 07:10 AM

Which engine would you prefer??
 
Based on my experience with Yanmar and Mack Boring (East Coast Distributor
for Yanmar), even Volvo is ahead of Yanmar, and hell will be frozen shut
before I would consider Volvo.


--
Lew

S/A: Challenge, The Bullet Proof Boat, (Under Construction in the Southland)
Visit: http://home.earthlink.net/~lewhodgett for Pictures



Peter Wiley July 17th 03 08:15 AM

Which engine would you prefer??
 
(Steven Shelikoff) wrote in message ...
On Wed, 16 Jul 2003 18:12:25 GMT, Brian Whatcott
wrote:

On 16 Jul 2003 08:48:08 -0700,
(brad) wrote:

Brian Whatcott wrote in message . ..
1900 running hours suggestds that overhaul time is due soon, maybe
very soon....

Brian Whatcott Altus OK

1900 hours time for a overhaul? I am not a mechanic, but I thought one
of the reasons one would go with a diesel is for its reliability. If I
had a piece of equipment that operated 8 hrs a day, 1900 hours would
be about 237 days of
operation . Most of the machinery ( diesel powered ) at my work
operates 24 hrs a day. The equipment does get a service ( oil and
filter change) every 250 hrs of operation. What a huge liability if
they had to overhaul every 1900 hours.



It's pleasing to hear about long-life engines.
Used to be, recips used on light aircraft had a mandated overhaul time
- for most of them it was 2000 hours. Now its "on condition" like
jets....

Comparing auto engine lives:

You would like to make 150 thousand miles plus before tearing an auto
down (certainly we are making those numbers on a pair of econoboxes
we own.) If you averaged 40 mph long term - that would be 3750
hours.


Yes, but if the auto engine spent a very high percentage of it's life
at, say, 80% max hp, you wouldn't be getting anywhere near those hours.
Cruising along at 55 mph, the average auto engine is probably only
operating at around 10% load.


True, but proper diesel engines are designed to operate under load.
The usual and only worthwhile rating is the continuous one, and it (at
least used to) mean what it says. Fed clean air, fuel and with routine
servicing, diesel engines will run for many, many thousands of hours.
Boat engines have a pathetic life mainly due to their operators'
ignorance. The other problem is engines that are started, run for 5
minutes and then shut down again.

Personally, provided spares were still available, I'd rather have an
older engine running at 1800 rpm than a newer one running at 3600 rpm.
You need a 2:1 reduction in the first case to get your prop shaft
speed below 1000 rpm and can swing a big 2 blade prop slowly. Finding
4:1 reduction boxes - I haven't seen any commonly offered.

My nearly 40 y/o Perkins diesel in my tractor *always* starts and I
bought it in 1988. Over the last 15 years, all I've ever done is
change the oil and filters.

Peter Wiley

Steven Shelikoff July 17th 03 01:48 PM

Which engine would you prefer??
 
On Wed, 16 Jul 2003 23:59:57 GMT, Brian Whatcott
wrote:

On Wed, 16 Jul 2003 23:13:32 GMT, (Steven
Shelikoff) wrote:
///
Used to be, recips used on light aircraft had a mandated overhaul time
- for most of them it was 2000 hours. Now its "on condition" like
jets....

Comparing auto engine lives:

You would like to make 150 thousand miles plus before tearing an auto
down (certainly we are making those numbers on a pair of econoboxes
we own.) If you averaged 40 mph long term - that would be 3750
hours.


Yes, but if the auto engine spent a very high percentage of it's life
at, say, 80% max hp, you wouldn't be getting anywhere near those hours.
Cruising along at 55 mph, the average auto engine is probably only
operating at around 10% load.



This is the argument against the efforts to convert auto engines to
light aircraft use: the aviation duty is much harder, but then - the
irrigation pump engine endurance is impressive: Im not sure just how
many of those potential horses are actually pumping water, it's true.


I'm not sure it's as much an argument against converting auto engines to
light aircraft use as much as it is one that says if you do convert an
auto engine to light aircraft use, don't expect it to go as long between
overhauls as the same engine in a car.

Steve

Ken Coit July 22nd 03 11:07 PM

Which engine would you prefer??
 
Jere,

I agree that there is more to consider than the number of cylinders, but
there are so many variables in an installation, that I wouldn't expect two
engines of the model and age to sound the same in the same boat, let alone a
different boat. The Beta I did see on a boat was very quiet, but I don't
know whether that is because it was naturally quiet, quiet because it was
boxed with lots of insulation, or quiet because it was driving an hydraulic
pump instead of a prop.

What I do know is that Robinhood Yachts is currently using the Yanmar 3JH3E
in the same hull as our boat. If I can presume that a manufacturer that is
going to build a $250,000 boat is going to spend at least a little time
analyzing which modern engine to use, then the Yanmar is a good bet.

However, lots of people on this list love the Perkins....

Keep on sailing,

Ken


"Jere Lull" wrote in message
...
Ken Coit wrote:

I have had others comment elsewhere that the Yanmar is the rough running
engine and I don't understand why a three cylinder engine running at

roughly
20% faster for a given power output, could be quieter and smoother than a

4
cylinder engine at that same power level. This is especially true if the
4-banger has greater displacement and would be running at, say, 3000 RPM

at
max continuous rating of 37 SHP when the 3 banger is running at 3650 RPM

at
a similar power level.


There's more to vibration and noise than the number of cylinders.

Why not see if you can get a ride on boats with each?

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/




Jere Lull July 23rd 03 02:03 AM

Which engine would you prefer??
 
Ken Coit wrote:

Jere,

I agree that there is more to consider than the number of cylinders, but
there are so many variables in an installation, that I wouldn't expect two
engines of the model and age to sound the same in the same boat, let alone a
different boat. The Beta I did see on a boat was very quiet, but I don't
know whether that is because it was naturally quiet, quiet because it was
boxed with lots of insulation, or quiet because it was driving an hydraulic
pump instead of a prop.

All true, which implies that whatever you choose, a proper installation
will make it as smooth and quiet as you require.

What I do know is that Robinhood Yachts is currently using the Yanmar 3JH3E
in the same hull as our boat. If I can presume that a manufacturer that is
going to build a $250,000 boat is going to spend at least a little time
analyzing which modern engine to use, then the Yanmar is a good bet.

Unluckily, sometimes they choose an engine by cost or some other
criteria, so while I like Yanmars, I wouldn't make assumptions. 'Course,
you might call up the factory and ask. It could well be that the Yanmar
is the best engine for some reason.

However, lots of people on this list love the Perkins....

And some who like two stroke outboards and SeaGulls.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/


Evan Gatehouse July 23rd 03 07:51 AM

Which engine would you prefer??
 

"Ken Coit" wrote in message
. com...
pump instead of a prop.

What I do know is that Robinhood Yachts is currently using the Yanmar

3JH3E
in the same hull as our boat. If I can presume that a manufacturer that

is
going to build a $250,000 boat is going to spend at least a little time
analyzing which modern engine to use, then the Yanmar is a good bet.


You'd be surprised. I was present during a discussion about what engine to
use on a 39' racer/cruiser. Choices were Yanmar and Volvo of about same
HP/weight. Volvo won because it was about $1000 cheaper for the builder. I
wanted the Yanmar because I know how much owners have to pay for Volvo
parts.


--
Evan Gatehouse

you'll have to rewrite my email address to get to me
ceilydh AT 3web dot net
(fools the spammers)



Ken Coit July 25th 03 04:35 PM

Which engine would you prefer??
 
I heard from a dealer recently that Volvo is doing better with parts
pricing, but the history is going to be hard to live down. They also seem
to be using Perkins blocks in some of their engines.

I think the amount of good will they have lost is probably fatal and I would
not want to bet the success of my 39 ft. cruiser on a Volvo engine.

Ken



"Evan Gatehouse" wrote in message
...

"Ken Coit" wrote in message
. com...
pump instead of a prop.

What I do know is that Robinhood Yachts is currently using the Yanmar

3JH3E
in the same hull as our boat. If I can presume that a manufacturer that

is
going to build a $250,000 boat is going to spend at least a little time
analyzing which modern engine to use, then the Yanmar is a good bet.


You'd be surprised. I was present during a discussion about what engine

to
use on a 39' racer/cruiser. Choices were Yanmar and Volvo of about same
HP/weight. Volvo won because it was about $1000 cheaper for the builder.

I
wanted the Yanmar because I know how much owners have to pay for Volvo
parts.


--
Evan Gatehouse

you'll have to rewrite my email address to get to me
ceilydh AT 3web dot net
(fools the spammers)





noland July 29th 03 03:00 AM

Which engine would you prefer??
 
"Ken Coit" wrote in message .com...
Presuming you were looking to buy a used boat, which engine would you rather
see in her:

Remanufactured Perkins 4-108
New BetaMarine 1505
New Yanmar 3JH3E

These are all adequate to the job of pushing a 16000 # boat at hull speed,
so the question is one of your personal preference.

Thanks in advance,

Ken Coit
S/V Parfait
Raleigh, NC


I have both a 4-108 which is getting harder to repair or rebuild cost
effectivly, and a Beta marine 1505 which is the Kubota 4 that is
everywhere in the world and still in production, and Yanmar being a 3
makes it a little to shakey for me, so I chose the Beta, and it is
amazing.


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