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 Engine temp variations 
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Joined: Wed Feb 13, 2013 4:04 pm
Posts: 65
What is considered a reasonable variation in engine temperature when driving?

I sometimes see mine vary between 160-200 degrees F under different driving conditions. 160F on the open road and anywhere up to 200F in traffic.

I've noticed new cars dont seem to move once they get up to temp. Is it as simple as thermo fans that regulate the temp?

How important is engine temp stability in getting a good tune from the carb.

Hysteric


Wed Jan 27, 2016 6:41 am
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Joined: Sun Jun 23, 2013 1:41 pm
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Location: Phila. Penn.
You seemed to have a pretty good thread going on ST about the first questions.
But
Quote:
How important is engine temp stability in getting a good tune from the carb.
wasn't address (maybe not even brought up?)

I'm going to guess that the coolant is incidental, the oil may be somewhat important, and the intake manifold and combustion chamber temperatures most important.


Sat Feb 13, 2016 11:12 pm
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Joined: Fri Feb 08, 2013 2:37 pm
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Why does it only run 160° on the road? What thermostat? Unless you avoiding a detonation problem resulting from low octane with high compression ratio, it is usually better to run as hot as possible without having trouble with vapor lock or carb percolating ….problematic with the pump gas nowadays … Just like in racing, it is important for temperature to be consistent.


Sun Feb 14, 2016 1:57 am
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Joined: Mon Dec 29, 2014 1:26 am
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And weirdly, I've seen that the max temp with a 160* stat will be higher than with a 180*. Just what you described, wide swings from 160* to near 200*. With everything the same except switching to a 180* stat, the temp range goes from 180* to a max of 185-190* or so.

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Sun Feb 14, 2016 6:40 am
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Joined: Fri Feb 08, 2013 5:50 pm
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Sounds like some stats are working correct, some not, maybe a China influence there?


Sun Feb 14, 2016 1:21 pm
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Stat restriction affects water pressure in the engine between the pump outlet and the stat restriction, so affects localized hot spot nucleate boiling (or not).


Sun Feb 14, 2016 5:11 pm
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Joined: Wed Feb 13, 2013 4:04 pm
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Quote:
Just like in racing, it is important for temperature to be consistent.


I figured the more consistant the running temp the better especially from a tuning perspective.

I'll have to have a look at the Thermostat but i want to say 185.


Fri Feb 19, 2016 9:49 pm
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