JShadzi at JShadzi at
Fri Aug 9 11:52:07 EDT 2002

[ Picked text/plain from multipart/alternative ]
You can obviously test the whole high EGT theory at part throttle in a matter
of seconds by simply riching up the part throttle fueling and seeing how it
affects your oil temps, but like I said, I run real lean mixtures and EGT's
of 12-1400 in my car all the time with high rise in oil temp.

I can't imagine the EGT's getting much higher than 1400 in any part throttle
condition, no matter how lean its running, and 1400 (worst case scenario)
just isn't sky high as far as really increasing engine temp, its about 1 or
200F higher than an ideal mixture would be.

I guess what concerns me about this thread is that all of a sudden you have a
few people who have little experience/never tuned fuel mixtures, and who have
not likely seen an EGT gauge jumping in _not_ with theories, but unequivocal
truths.  Seems to be happening a lot lately on the list.

I'm more for exploring theories and testing soloutions than spouting off
factual statements that have no backing or support.

So, let the testing begin  =)


In a message dated 8/9/2002 5:34:29 AM Pacific Daylight Time,
mswanson at writes:

> > it's not the head that heats the oil to 150 C, it's the two *really* hot
> > places it goes, which are the turbo and the backs of the pistons.  Of
> > course the turbo is also water cooled, so it is not such a factor.
> > However, the oil sprayed on the pistons gets some serious exposure to
> > heat, and then *is not* water cooled before passing the temp sender.
> yes, that's true.  and plus the specific heat of water is so damn high
> that I can buy that you wouldn't see violent swings in the coolant
> temps.. but eventually a 150c oil temp HAS to transfer some heat energy
> to the coolant.

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