3/8/03
James,
If this theory is true it certainly goes directly against my
understanding. The hotter the coolant is, the hotter every other part of
the engine is also, I would think. This means the entire intake system
would also be hotter. My thought is that this higher temperature would
warm up the incoming charge of fuel/air mixture more, thus causing it to
expand and lose density more than it would in a cooler condition. Then
there would be less actual mixture (mass) in the cylinder, so less power
would be produced. This lower density charge however, combined with
quicker vaporization of the fuel, ought to improve fuel economy slightly--a
trade off for the power loss.
Just my -2 BHP.
Cheers,
Dave Kernberger
----------------------------------------------------
>In theory, the hotter the enigne is (relative to ambient), the more
>power it will produce, but I don't know that 20 deg. will make a bit of
>difference. On the other side, a cooler engine bay will mean a cooler
>fuel/air charge and less chance of vapor lock, so I'd run it as hot as I
>could until I had fuel problems or overheating at idle.
>Just my 2 BHP worth.
>James J.
>
>
>james wrote:
>
>>Gents, I am thinking about putting my new engine back into my V8. It is a
>>'63 Olds 215 with 4bbl. My current thermostat is a 185 deg stat, the book
>>lists a stock opening temp of 167-172. Can anyone offer any good reason to
>>chose one stat over another. In the range that I am considering, I think I
>>have 165, 175, and 185 available. I live in Ohio FWIW. I don't expect to
>>have any problems with the 185 stat as that is what was installed in the
>>first engine, but if there is a reason to go for a lower temp I would like
>>to know. I need to replace it either way. I know that emissions are lower
>>for higher temps but I am permanently emissions exempt so that is not a
>>factor. Are there any performance benefits to a certain temp over another?
>>Any other benefits/considerations?
///
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