On Wed, 22 Nov 2006 00:58:01 +0000, Gordon Wedman wrote:

and don't some of those 2 strokes have fuel-to-oil ratios approaching 100:1
?
Not a lot of pollution there.

Oh, really? How much pollution is a lot? (Yes, that's a rhetorical
question.)

Matt O.

With the new legislation coming in we are looking at 2 stroke vs 4
stroke. I am aware that few people use 4 strokes on inflatables and
fewer would manhandle them down beaches removing and replacing them
daily as we do.
Does anyone have any experience of using 4 strokes on inflatable boats
in this way? Are there any implcations to the angle you can carry/store
them?

I have replaced a small auxiliary outboard on my trailer sailer with a
4-stroke, it's heavier, seems a little less powerful, quieter, far more
economic & easier to start. I've never carried it anywhere a beach but
its a pain to get into the tender.... (They aren't called tender for
nothing)

My club has recently bought a 5m rib with a 4-stroke 40 on the back to
'patrol' the races. Its nice, but the engine IS heavy, is more
economical, less fast, more quiet (See a pattern here?) My only gripe
is that once you've rescued someone, with the rescued dinghy alongside
and 3 people on board, the thing won't plane.

Unless you have light divers with light diving gear and light lead
weights, I'd recommend you buy a 4-stroke 60 for the back of your new
boat. It'll still use less fuel and you should leave it bolted to the
back of the boat, anyway.

Artie

Arturo Ui wrote:
snip
My club has recently bought a 5m rib with a 4-stroke 40 on the back to
'patrol' the races. Its nice, but the engine IS heavy, is more
economical, less fast, more quiet (See a pattern here?) My only gripe
is that once you've rescued someone, with the rescued dinghy alongside
and 3 people on board, the thing won't plane.

If it's all the same to you, I'd rather you didn't do 25kts with my
dinghy alongside... reminds me of a story I once heard of someone who
was towed in by an RAF launch...

However 40 doesn't seem an awful lot for a 5m RIB full of divers and
tanks. It seems to me if you get a bigger motor you won't have to run
it flat out all the time, so it'll last longer too. Not that I know a
lot about these things.

Andy

On Tue, 21 Nov 2006 13:13:14 -0800, ajw wrote:

I am a member of a Scuba diving club and we are investigating replacing
our outboard engines.

We currently have two Zodiac 5m inflatable boats (not RIBs) with 40HP 2
stroke Mariner outboards. These are reaching the end of their lives and
we are looking at replacing them.

With the new legislation coming in we are looking at 2 stroke vs 4
stroke. I am aware that few people use 4 strokes on inflatables and
fewer would manhandle them down beaches removing and replacing them
daily as we do.

4 strokes are more efficient, reliable, quieter, and cleaner than 2
strokes, but they are heavier. However, a newer 4 stroke may be lighter
than an older 2 stroke. So look at specs when you shop.

I believe there are newer 2 strokes that meet environmental
regs -- I don't know about in your size/power range though.

Comparing specs is one thing, but consider what's available to you
locally, parts and service wise. Everything's a compromise.

Does anyone have any experience of using 4 strokes on inflatable boats
in this way? Are there any implcations to the angle you can carry/store
them?

The small Hondas I've used can be laid on their side indefinitely. I
don't know about larger ones.

Matt O.

My Honda 8HP had to be laid down a specific way.

SBV


"Matt O'Toole" wrote in message
news
On Tue, 21 Nov 2006 13:13:14 -0800, ajw wrote:

I am a member of a Scuba diving club and we are
investigating replacing
our outboard engines.

We currently have two Zodiac 5m inflatable boats (not
RIBs) with 40HP 2
stroke Mariner outboards. These are reaching the end of
their lives and
we are looking at replacing them.

With the new legislation coming in we are looking at 2
stroke vs 4
stroke. I am aware that few people use 4 strokes on
inflatables and
fewer would manhandle them down beaches removing and
replacing them
daily as we do.

4 strokes are more efficient, reliable, quieter, and
cleaner than 2
strokes, but they are heavier. However, a newer 4 stroke
may be lighter
than an older 2 stroke. So look at specs when you shop.

I believe there are newer 2 strokes that meet
environmental
regs -- I don't know about in your size/power range
though.

Comparing specs is one thing, but consider what's
available to you
locally, parts and service wise. Everything's a
compromise.

Does anyone have any experience of using 4 strokes on
inflatable boats
in this way? Are there any implcations to the angle you
can carry/store
them?

The small Hondas I've used can be laid on their side
indefinitely. I
don't know about larger ones.

Matt O.

On Wed, 22 Nov 2006 13:46:02 -0500, Scotty wrote:

My Honda 8HP had to be laid down a specific way.

Better than not being able to be laid down at all.

Matt O.

"Matt O'Toole" wrote in message
news
On Wed, 22 Nov 2006 13:46:02 -0500, Scotty wrote:

My Honda 8HP had to be laid down a specific way.

Better than not being able to be laid down at all.

I stored it for Winter standing up in my garage on a wall
bracket. Takes less room that way.

SBV

4 strokes are great for a lot of reasons, but if fuel quality is
questionable, they can be more trouble than 2 strokes. I've had fuel
problems with a 9.9 Yamaha 4 stroke, and an ob mechanic said water or trash
caused more problems w/4 strokes because of the smaller jets.

"Matt O'Toole" wrote in message
news
On Tue, 21 Nov 2006 13:13:14 -0800, ajw wrote:

I am a member of a Scuba diving club and we are investigating replacing
our outboard engines.

We currently have two Zodiac 5m inflatable boats (not RIBs) with 40HP 2
stroke Mariner outboards. These are reaching the end of their lives and
we are looking at replacing them.

With the new legislation coming in we are looking at 2 stroke vs 4
stroke. I am aware that few people use 4 strokes on inflatables and
fewer would manhandle them down beaches removing and replacing them
daily as we do.

4 strokes are more efficient, reliable, quieter, and cleaner than 2
strokes, but they are heavier. However, a newer 4 stroke may be lighter
than an older 2 stroke. So look at specs when you shop.

I believe there are newer 2 strokes that meet environmental
regs -- I don't know about in your size/power range though.

Comparing specs is one thing, but consider what's available to you
locally, parts and service wise. Everything's a compromise.

Does anyone have any experience of using 4 strokes on inflatable boats
in this way? Are there any implcations to the angle you can carry/store
them?

The small Hondas I've used can be laid on their side indefinitely. I
don't know about larger ones.

Matt O.

"Garland Gray II" wrote in
:

4 strokes are great for a lot of reasons, but if fuel quality is
questionable, they can be more trouble than 2 strokes. I've had fuel
problems with a 9.9 Yamaha 4 stroke, and an ob mechanic said water or
trash caused more problems w/4 strokes because of the smaller jets.



Also, if you look back at the "good ol' days", remember when
"winterizing" the old 2-stroker meant hauling it up the dock and putting
it in the garage until spring? When you took it out in spring, just as
greasy as you put it away, it wasn't all rusted up coated with oil like
it always was. You poured PREMIX gas into it and drove away.

We have a Nissan 8hp 4-stroker for a Foldabote 12 on Lionheart. The carb
has been apart a few times, now, because it had raw gas in it that
evaporated into solid shellac, plugging the jets so it wouldn't start.
This wasn't an issue with the old PREMIX 2-stroker because the oil in the
gas DIDN'T evaporate and kept the stuff left in the carbs in LIQUID form
the new gas would simply remix with and away we went. My little Yamaha 3
with the gas tank on top is like that, too. It was stored for years and
the premix still kept it from solidifying to shellac.

Changing the oil on a marina dock or sailboat STILL sucks, too....

As to the 100:1 oilers...no thanks. 50:1 is too thin to oil crankcase
bearings, no matter now much greenies and the EPA hype it. When I sold
my 1997 Mercury Sport Jet 175hp-powered Sea Rayder, all 6 cylinders were
within 5 pounds of their original compression and ran great on 40:1
PREMIX, the troublesome Mercury plastic oil injection pump and system
having been removed as soon as I found out about the 2nd recall blowing
powerheads with NO LUBRICATION. That boat's still running and the engine
had well over 1000 hours on it....on PREMIX.

Larry
--
According to EPA, all lakes that have had 2-stroke engines running in
them for the last 100 years must be 6" deep in motor oil. See it?
Oil floats, ya know!

As to the 100:1 oilers...no thanks. 50:1 is too thin to oil crankcase
bearings, no matter now much greenies and the EPA hype it. When I sold
my 1997 Mercury Sport Jet 175hp-powered Sea Rayder, all 6 cylinders were
within 5 pounds of their original compression and ran great on 40:1
PREMIX, the troublesome Mercury plastic oil injection pump and system
having been removed as soon as I found out about the 2nd recall blowing
powerheads with NO LUBRICATION. That boat's still running and the engine
had well over 1000 hours on it....on PREMIX.



I haven't seen any evidence to support this. Only outboards I've messed
with have been either 50:1 or 100:1, one of the latter is still going
strong at over 15 years old, and my V115 uses 50:1 and it still runs
great despite being almost 40 years old. Just how long do these things
have to last? Why use more oil than needed? That stuff is $$$.