Navigation Question
 

I don't know where you got you figures from, but here is a dealer trying to
selling a 125 hp Yanmar diesel against a 220 hp gas engine who "claims" the
Yanmar uses 6.3 gallons per hour, or a little less than 20 hp per gallon per
hour.

http://www.mastry.com/article_1.htm

* dealer also "claims" the 220 gas engine (less than 2x the size) burns about
3x the fuel, something the EPA doesn't agree with)



OK, the Flywheel Horsepower of the Yanmar 3YM30 is 29HP at 2800 RPM, while
burning less than a gallon an hour of diesel. That's what the engine
manufacturer says in their spec sheet.

Fuel economy at WOT will be closer to the "1 gal/16hp" rate, or if you
measure
propeller output you'll be closer to that number. However, when one talks
about
"pushing a Benny with a 20hp engine" they really mean running a 2GM20 at 2600
rpm, where its putting out under 8 hp at the prop and burning less than half
a
gallon an hour. I have 2 2GM20's that consistently use 0.4 gallons each per
hour.

And besides, the gallons in Britain are 25% bigger.




"JAXAshby" wrote in message
...
dougies, you idgit. That is NOT the manufacturer's spec sheet, but rather
some
clown's ramblings. This time go check the spec sheets that engine
manufacturers put out.

A good explanation is at

http://www.prime-mover.org/Engines/GArticles/bsfc.html

which BTW also quotes some figures for various types of engines... which
BTW don't agree with your figures, surprise surprise.

Fresh Breezes- Doug King

Navigation Question
 

Jax is a LIAR, Jax is a STUPID LIAR,
Jax is so STUPID that he gives fuel usage of a 125 hp engine to try and
prove the fuel usage of a 20 hp Diesel. When was the last time anyone
has seen a Mono Aux traveling a 33 mph?

Jax is a LIAR!! Jax is a TROLLING LIAR!!
Jax is such a STUPID LIAR that he proves himself to be a STUPID LIAR by
just letting him talk (or Post) He and his mentor do not know the
meaning of truth

Jax doesn't even know were he lives; He is a LIAR!!

Jax doesn't know what kind of boat he owns; He is a LIAR

In his own Murky Mensa Mind (LOL) he still doesn't know the location of
the Gulf Stream and tries to Lie his way out of his IGNORANCE.

Trying to reason with a confirmed LIAR is a useless exercise. For this
reason I terminate any farther discussions with;
THE LIAR!!!

Ole Thom

Navigation Question
 

okay, old fart, here is a fuel rate curve for another engine. It shows, btw,
the best hp/gallon at near max hp (to be expected, because in a diesel max
torque [best efficiency] rpm is near max hp rpm)

http://www.deltahawkengines.com/perfor02.htm


btw old fart, are *really* trying to say large diesel engines make horse****
use of diesel fuel to generate each hp output as compared to small diesel
engines? That IS what you said. Did you mean it?

Jax is a LIAR, Jax is a STUPID LIAR,
Jax is so STUPID that he gives fuel usage of a 125 hp engine to try and
prove the fuel usage of a 20 hp Diesel. When was the last time anyone
has seen a Mono Aux traveling a 33 mph?

Jax is a LIAR!! Jax is a TROLLING LIAR!!
Jax is such a STUPID LIAR that he proves himself to be a STUPID LIAR by
just letting him talk (or Post) He and his mentor do not know the
meaning of truth

Jax doesn't even know were he lives; He is a LIAR!!

Jax doesn't know what kind of boat he owns; He is a LIAR

In his own Murky Mensa Mind (LOL) he still doesn't know the location of
the Gulf Stream and tries to Lie his way out of his IGNORANCE.

Trying to reason with a confirmed LIAR is a useless exercise. For this
reason I terminate any farther discussions with;
THE LIAR!!!

Ole Thom

Navigation Question
 

old fart, here is the Lister engine under brand new engine, and laboratory
conditions claiming about 19 hp/gallon/hour (that's Imperial gallons, btw)

http://www.lovson.com/engineering.html

Navigation Question
 

JAXAshby wrote:
....here is the Lister engine under brand new engine, and laboratory
conditions claiming about 19 hp/gallon/hour (that's Imperial gallons, btw)

Which would make it closer to 24 gph in US gallons... which would make
your original quoted figure... 'way wrong.

Does posting false info give you some kind of thrill? Are you so
unimportant and so downtrodden that getting people to insult you on the
Internet gives you a sense of importance? WTF *is* wrong with you, Jax?
Not that I actually care, it's sort of just idle curiosity.

DSK

Navigation Question
 

You're using an aviation turbo diesel to prove your point? That's rich!

If you simply go to the Yanmar site, or the Mastry site you'll find the curves
for typical marine diesels. Contrary to your claim, the best efficiency is
usually down around 2400 RPM, not at full throttle where the engine's advertised
HP rating is taken.

The Yanmar 4JH3-HTE your article talks about is rated at 175 grams/hp-hour at
full power, which is 18 HP per gallon, but the efficiency goes up to 153 g/hp-h
at reduced rpm, which is 21 HP per gallon.

Sorry jaxie, the mistake you're making is thinking that marine engines are most
efficient at full throttle, or that they are normally run that way.


"JAXAshby" wrote in message
...
okay, old fart, here is a fuel rate curve for another engine. It shows, btw,
the best hp/gallon at near max hp (to be expected, because in a diesel max
torque [best efficiency] rpm is near max hp rpm)

http://www.deltahawkengines.com/perfor02.htm


btw old fart, are *really* trying to say large diesel engines make horse****
use of diesel fuel to generate each hp output as compared to small diesel
engines? That IS what you said. Did you mean it?

Jax is a LIAR, Jax is a STUPID LIAR,
Jax is so STUPID that he gives fuel usage of a 125 hp engine to try and
prove the fuel usage of a 20 hp Diesel. When was the last time anyone
has seen a Mono Aux traveling a 33 mph?

Jax is a LIAR!! Jax is a TROLLING LIAR!!
Jax is such a STUPID LIAR that he proves himself to be a STUPID LIAR by
just letting him talk (or Post) He and his mentor do not know the
meaning of truth

Jax doesn't even know were he lives; He is a LIAR!!

Jax doesn't know what kind of boat he owns; He is a LIAR

In his own Murky Mensa Mind (LOL) he still doesn't know the location of
the Gulf Stream and tries to Lie his way out of his IGNORANCE.

Trying to reason with a confirmed LIAR is a useless exercise. For this
reason I terminate any farther discussions with;
THE LIAR!!!

Ole Thom

Navigation Question
 

On Mon, 23 Feb 2004 13:04:31 -0500, "Jeff Morris"
wrote:

You're using an aviation turbo diesel to prove your point? That's rich!

If you simply go to the Yanmar site, or the Mastry site you'll find the curves
for typical marine diesels. Contrary to your claim, the best efficiency is
usually down around 2400 RPM, not at full throttle where the engine's advertised
HP rating is taken.

The Yanmar 4JH3-HTE your article talks about is rated at 175 grams/hp-hour at
full power, which is 18 HP per gallon, but the efficiency goes up to 153 g/hp-h
at reduced rpm, which is 21 HP per gallon.

Sorry jaxie, the mistake you're making is thinking that marine engines are most
efficient at full throttle, or that they are normally run that way.

I think your last point is the real issue. How much hp is required to
push a given displacement sailboat to hullspeed in a given set of
conditions? Generally it has been around 2500 rpm in my experience.
Just as I don't generally drive my auto in such a way as to require
all 225 hp, I don't motor in my sailboat in such a way as to require
all 27 hp. I have never calculated my fuel consumption, but 1 gallon
per hour would be WAY high, in my experience. Maybe if my boat was a
barge with a shag carpet on the bottom and an Atomic 4, maybe...:)



"JAXAshby" wrote in message
...
okay, old fart, here is a fuel rate curve for another engine. It shows, btw,
the best hp/gallon at near max hp (to be expected, because in a diesel max
torque [best efficiency] rpm is near max hp rpm)

http://www.deltahawkengines.com/perfor02.htm


btw old fart, are *really* trying to say large diesel engines make horse****
use of diesel fuel to generate each hp output as compared to small diesel
engines? That IS what you said. Did you mean it?

Jax is a LIAR, Jax is a STUPID LIAR,
Jax is so STUPID that he gives fuel usage of a 125 hp engine to try and
prove the fuel usage of a 20 hp Diesel. When was the last time anyone
has seen a Mono Aux traveling a 33 mph?

Jax is a LIAR!! Jax is a TROLLING LIAR!!
Jax is such a STUPID LIAR that he proves himself to be a STUPID LIAR by
just letting him talk (or Post) He and his mentor do not know the
meaning of truth

Jax doesn't even know were he lives; He is a LIAR!!

Jax doesn't know what kind of boat he owns; He is a LIAR

In his own Murky Mensa Mind (LOL) he still doesn't know the location of
the Gulf Stream and tries to Lie his way out of his IGNORANCE.

Trying to reason with a confirmed LIAR is a useless exercise. For this
reason I terminate any farther discussions with;
THE LIAR!!!

Ole Thom

Navigation Question
 

Now you're using de-tuned farm engines to prove your point. But once again, you
screw it up! On the same page they list others that are over 18 hp/gal-hour,
and that's detuned to run at 1500 rpm, and using US gallons. Those numbers
listed as "Specific Fuel Consumption" is in "grams per HP-hour"; you have to be
capable of a bit of math to properly convert to hp-hours/gallon.

"JAXAshby" wrote in message
...
old fart, here is the Lister engine under brand new engine, and laboratory
conditions claiming about 19 hp/gallon/hour (that's Imperial gallons, btw)

http://www.lovson.com/engineering.html

Navigation Question
 

dougies, you inverted your math. try again.

JAXAshby wrote:
....here is the Lister engine under brand new engine, and laboratory
conditions claiming about 19 hp/gallon/hour (that's Imperial gallons, btw)

Which would make it closer to 24 gph in US gallons... which would make
your original quoted figure... 'way wrong.

Does posting false info give you some kind of thrill? Are you so
unimportant and so downtrodden that getting people to insult you on the
Internet gives you a sense of importance? WTF *is* wrong with you, Jax?
Not that I actually care, it's sort of just idle curiosity.

DSK

Navigation Question
 

right, jeffie, a diesel is NOT a diesel if a big prop is hooked up to it rather
than a small prop.

btw jeffie, I clearly stated that max fuel efficiency is at max torque rpm, not
max hp rpm.

your reading skills are influenced by your worthless hope that you are not a
slow learner.

You're using an aviation turbo diesel to prove your point? That's rich!

If you simply go to the Yanmar site, or the Mastry site you'll find the
curves
for typical marine diesels. Contrary to your claim, the best efficiency is
usually down around 2400 RPM, not at full throttle where the engine's
advertised
HP rating is taken.

The Yanmar 4JH3-HTE your article talks about is rated at 175 grams/hp-hour at
full power, which is 18 HP per gallon, but the efficiency goes up to 153
g/hp-h
at reduced rpm, which is 21 HP per gallon.

Sorry jaxie, the mistake you're making is thinking that marine engines are
most
efficient at full throttle, or that they are normally run that way.


"JAXAshby" wrote in message
...
okay, old fart, here is a fuel rate curve for another engine. It shows,
btw,
the best hp/gallon at near max hp (to be expected, because in a diesel max
torque [best efficiency] rpm is near max hp rpm)

http://www.deltahawkengines.com/perfor02.htm


btw old fart, are *really* trying to say large diesel engines make
horse****
use of diesel fuel to generate each hp output as compared to small diesel
engines? That IS what you said. Did you mean it?

Jax is a LIAR, Jax is a STUPID LIAR,
Jax is so STUPID that he gives fuel usage of a 125 hp engine to try and
prove the fuel usage of a 20 hp Diesel. When was the last time anyone
has seen a Mono Aux traveling a 33 mph?

Jax is a LIAR!! Jax is a TROLLING LIAR!!
Jax is such a STUPID LIAR that he proves himself to be a STUPID LIAR by
just letting him talk (or Post) He and his mentor do not know the
meaning of truth

Jax doesn't even know were he lives; He is a LIAR!!

Jax doesn't know what kind of boat he owns; He is a LIAR

In his own Murky Mensa Mind (LOL) he still doesn't know the location of
the Gulf Stream and tries to Lie his way out of his IGNORANCE.

Trying to reason with a confirmed LIAR is a useless exercise. For this
reason I terminate any farther discussions with;
THE LIAR!!!

Ole Thom