Shortwave Sportfishing wrote:
Never shut the E-TEC 200 HO off the entire time we were out - four
hours of constant running - idle (600 rpm), trolling (600 rpm), cruise
speed (35 mph @ 4100 rpm) and about six/seven minutes of WOT (54 mph @
5400 rpm). Four house of run time.

Refilled on the way home - same deal - right to the tippy top.


That's a bad idea.

Ok, here we go.

4.883 gallons of gas.

That works out to 1.22075 gph.

I don't believe it either, but them's the facts as they say.

And if anybody calls me a liar, I have a witness who is willing to
"testify" as it were. :)

Air lock and/or heat expansion. If you refeuled the first
time in the morning, the stuff was nice & cool. How big is
your tank? After being in the boat in the sun for hours, the
fuel can expand several gallons worth in a relatively small
tank.

DSK

"DSK" wrote in message
...
Shortwave Sportfishing wrote:
Never shut the E-TEC 200 HO off the entire time we were out - four
hours of constant running - idle (600 rpm), trolling (600 rpm), cruise
speed (35 mph @ 4100 rpm) and about six/seven minutes of WOT (54 mph @
5400 rpm). Four house of run time.

Refilled on the way home - same deal - right to the tippy top.


That's a bad idea.

Ok, here we go.

4.883 gallons of gas.

That works out to 1.22075 gph.

I don't believe it either, but them's the facts as they say.

And if anybody calls me a liar, I have a witness who is willing to
"testify" as it were. :)

Air lock and/or heat expansion. If you refeuled the first time in the
morning, the stuff was nice & cool. How big is your tank? After being in
the boat in the sun for hours, the fuel can expand several gallons worth
in a relatively small tank.

DSK


Huh?

Maybe I should only drive on hot days.

Eisboch

DSK wrote:
Shortwave Sportfishing wrote:
Never shut the E-TEC 200 HO off the entire time we were out - four
hours of constant running - idle (600 rpm), trolling (600 rpm), cruise
speed (35 mph @ 4100 rpm) and about six/seven minutes of WOT (54 mph @
5400 rpm). Four house of run time.

Refilled on the way home - same deal - right to the tippy top.


That's a bad idea.

Ok, here we go.

4.883 gallons of gas.

That works out to 1.22075 gph.

I don't believe it either, but them's the facts as they say.

And if anybody calls me a liar, I have a witness who is willing to
"testify" as it were. :)

Air lock and/or heat expansion. If you refeuled the first
time in the morning, the stuff was nice & cool. How big is
your tank? After being in the boat in the sun for hours, the
fuel can expand several gallons worth in a relatively small
tank.

DSK

The rate of thermal expansion for gasoline won't anywhere near equal
several gallons in smallish tank even at extreme temperature
differentials.
From scienceclarified.com:

To calculate change in volume, the formula is very much the same as for
change in length; only a few particulars are different. In the formula
dV = bVOdT, the last term, again, means change in temperature, while
dV means change in volume and VO is the original volume. The letter b
refers to the coefficient of volume expansion. The latter is expressed
in terms of 10-4/°C, or 0.0001 per °C

"Shortwave Sportfishing" wrote in message
...
On Thu, 10 Aug 2006 11:40:19 -0400, DSK wrote:

Shortwave Sportfishing wrote:
Never shut the E-TEC 200 HO off the entire time we were out - four
hours of constant running - idle (600 rpm), trolling (600 rpm), cruise
speed (35 mph @ 4100 rpm) and about six/seven minutes of WOT (54 mph @
5400 rpm). Four house of run time.

Refilled on the way home - same deal - right to the tippy top.

That's a bad idea.

I understand why you would think so, but for the short term and the
way the Ranger is vented, it isn't a problem just for testing
purposes.

Next time, it's a set amount of gas and we'll see what happens.

Ok, here we go.

4.883 gallons of gas.

That works out to 1.22075 gph.

I don't believe it either, but them's the facts as they say.

And if anybody calls me a liar, I have a witness who is willing to
"testify" as it were. :)

Air lock and/or heat expansion. If you refeuled the first
time in the morning, the stuff was nice & cool. How big is
your tank? After being in the boat in the sun for hours, the
fuel can expand several gallons worth in a relatively small
tank.

Nah - can't buy that - not with a 49 gallon tank. The expansion for
that amount of fuel is insignificant.

If it was diesel, I might agree with you, but not gas.


No way. "Several gallons"? Maybe if you had a 10,000 gal tank, gas or
diesel.

Eisboch

Joey916 wrote:
I hit up one of our chemical engineers and ran the scenario about fuel
expansion by him and he agrees with Shortwave's formula. In other
words, a 40 gal fuel tank that was filled when the fuel temp (not
ambient) was at 60F and then raised fuel temp to 110F (which would be
hard to do) or a difference of 27.78C will only expand 0.1112 gallons,
or less than a pint.

I think what people perceive as fuel expanding in a cold tank is
actually the fuel vapors expanding. They don't have anymore fuel,
they are experiencing fuel vapors expanding tanks, pushing fuel out
vent hoses, etc. Fuel vapors are much more apt to expand, something
like 1.5% per deg Celsius (much higher than the .01% of a liquid), plus
accounting for the low boiling point of gasoline and presto, a cold
tank of fuel becomes a pressure cooker when the ambient temp goes up 15
to 20 deg. No extra fuel, just a lot of extra vapor molecules pushing
on everything else.

So with that info, Shortwave is either A) Getting really good HPG, B)
Didn't fill up the second time as high as the first time, C) Idled
much more than he thinks, D) Is an out right liar... But he didn't
experience significant fuel expansion. My bet is on A.

I agree. If you work the formula that I provided, you'll see that the
fuel expansion idea doesn't fly! On the other hand, I was reading in an
Engineering magazine that the Concorde, because it flies so fast that
friction heats the airframe so that it actually gets 7 to 10 inches
longer!

Oops. Sorry Bass, I gave Shortwave credit for the formula you found...
My bad.

basskisser wrote:
Joey916 wrote:
I hit up one of our chemical engineers and ran the scenario about fuel
expansion by him and he agrees with Shortwave's formula. In other
words, a 40 gal fuel tank that was filled when the fuel temp (not
ambient) was at 60F and then raised fuel temp to 110F (which would be
hard to do) or a difference of 27.78C will only expand 0.1112 gallons,
or less than a pint.

I think what people perceive as fuel expanding in a cold tank is
actually the fuel vapors expanding. They don't have anymore fuel,
they are experiencing fuel vapors expanding tanks, pushing fuel out
vent hoses, etc. Fuel vapors are much more apt to expand, something
like 1.5% per deg Celsius (much higher than the .01% of a liquid), plus
accounting for the low boiling point of gasoline and presto, a cold
tank of fuel becomes a pressure cooker when the ambient temp goes up 15
to 20 deg. No extra fuel, just a lot of extra vapor molecules pushing
on everything else.

So with that info, Shortwave is either A) Getting really good HPG, B)
Didn't fill up the second time as high as the first time, C) Idled
much more than he thinks, D) Is an out right liar... But he didn't
experience significant fuel expansion. My bet is on A.

I agree. If you work the formula that I provided, you'll see that the
fuel expansion idea doesn't fly! On the other hand, I was reading in an
Engineering magazine that the Concorde, because it flies so fast that
friction heats the airframe so that it actually gets 7 to 10 inches
longer!

Joey916 wrote:
Oops. Sorry Bass, I gave Shortwave credit for the formula you found...
My bad.

Not a problem, most of us in this thread have come to the same
conclusions! And I agree with your assessment that some people were
thinking vapor as opposed to the liquid.