Engine Operating Temps

[Mark Romans]

I disagree about the cooler the more power.  Read Smokey Yunicks
"Power Secrets" Book.  I originally did the cooler thermostat stuff.  That
is fine on the dyno,  however on the street in the summer with the ac on I
have been unable to keep the car that cool. It runs at 220 deg f.  So I
tuned it to run at that temp.  Pulled some timing out of the map.  Smokey
says the engine will make 3% more power at 210 deg f. than at a lower temp.
EFI also allows you to run the max advance and control fuel distribution
with a nice hot engine.  Before I put the headers on it did 290 hp at the
rear wheels and it runs a LOT better now.  @ 195 deg f minimum.   Buy the
book.  Smokey is a very smart guy.
Mark
-----Original Message-----
From: David A. Cooley <n5xmt at bellsouth.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Monday, October 12, 1998 8:04 PM
Subject: Re: emulator question


>At 08:10 PM 10/12/98 -0500, you wrote:
>>
>>Thanks, I hadn't thought of that (although i haven't even picked
>>up the motor yet, so i haven't thought about a lot of things yet).
>>
>>I intend to install an oil cooler radiator from an RX-7 that's in
>>my parts bin.  It's the biggest oil cooler i've ever seen, and it
>>fits perfectly behind my air dam.  don't worry, i'll put a rock
>>guard and bendable bracket on it.
>>
>>I've been told that it's safe to run an engine like this, even with
>>aluminum heads (this motor has iron heads of course) up to 300 degrees
>>if i'm using this high-temp coolant.  What do you think of that?
>
>Well,
>It's a proven fact that Gas engines make more power the cooler they are...
>Allowing the engine to rise to 300 degrees will result in massive amounts
>of detonation and require the timing to be retarded to the point you make
>very little power.  That's why performance chips also reccomend you add a
>cooler thermostat.  Allows them to run more timing/boost (super/turbo
>charged engines).  Higher temps will also make the oil lose it's viscosity
>faster and contaminate faster.
>Later,
>Dave
>
>===========================================================
>           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
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