REFLECTOR: Gas temp

[Jim Sower]

Everybody's agreed that it's nice to have cold air (a good bit denser) 
and cold fuel (denser, but not measurably denser by instruments at our 
disposal).  The difference between warm and cold fuel is no way enough 
to justify any effort at all to cool it - the exception being return 
fuel from an automotive injection rail so as to minimize chances of 
vaporization upstream of the pump.  We take what we get and deal with it 
as best we can.  It isn't practical to attempt to alter what we get - it 
will cost much more than any benefits.  Get some tables that define 
precisely the variation of fuel density with temperature and calculate 
the additional %BTU you would get from cooling your fuel by x* below 
what it was when it came your way.  Are you talking about a certified 
system?  They are all so grotesquely inefficient that cooling the charge 
wouldn't change anything measurably.

Automotive type EFI is much more precise.  There are systems available 
that you can adjust mixture per cylinder to get the best, most precise 
fuel delivery possible, and it still doesn't make a significant 
difference what your fuel temp is.

Tune what you've got as best you can or upgrade your delivery system ... 
Jim  S.

John Dibble wrote:

> Yes, but what is important is that it will cool off the fuel/air 
> mixture, and the air part does contract considerably allowing more of 
> the mixture into the cylinder.  But still you need to cool the fuel 
> quite a bit to make a difference.
>
> John
>
> Jim Sower wrote:
>
>> As it cools off, it gets just a tad denser.  As a practical matter 
>> it's not enough to measure.
>>
>> velocityxlfg wrote:
>>
>>> I know some one out there know the answer to this . Fuel (Gas ) 
>>> carries more energy when it is chilled Right? So is it beneficial to 
>>> chill you fuel before  it enters the Fuel injection system? Would 
>>> this increase HP.  Ron
>>>
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