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Old 04-21-2019, 06:49 PM
Morris Morris is offline
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Join Date: Dec 2003
Location: Gurnee, IL
Cobra Make, Engine: Kirkham #259
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Quote:
Originally Posted by David Kirkham View Post
Differentials will get to 150 F within a few seconds of running--maybe 30. It's amazing how fast they heat up. Running temperatures are 200 F or so on the street and 220 F on the track is not uncommon. 240 F is too hot and it's time to get a cooler going.

250 F is time to stop and change the oil before you spend lots of $$$ to fix it.

David
On a short track we saw temps of 270*degrees....on a longer track like Road America we saw about 280*degrees.....that was when we changed Diff fluids to Mobil 1 75w140 Synthetic.....temps went down to 240*degrees and below....that was on a hot day in July....and we are using a cooler with a fan on it.....and we are using a Quaiffe Differential instead of a limited slip.....which will create less heat......and the Mobil 1 is good to approximately 500*degrees...so no concerns of a failure....

Do remember when we take KMP259 to the track ....we test the first & second sessions ....then we go as fast as we can....very typical of most racers....
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Morris
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