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Too much oil = Engine overheat

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Old 10-20-2001, 07:25 PM
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Will too much oil cause an engine to overheat?

My prairie 650 overheated several times today. I checked the oil and there was too much. Could this cause the motor to overheat?
 
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Old 10-21-2001, 01:43 PM
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Technically speaking I think it could. When the crank & rod have to push through the extra oil it puts a big strain on the motor...
 
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Old 11-09-2001, 11:26 PM
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Yes too much oil in the crankcase will cause engine to run hotter than normal,the oil will foam and lose its ability to cool.
 
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Old 11-12-2001, 09:47 AM
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Speaking along the lines of Two Strokes--Yes. Here's why for those interested:
Too much oil will effectively lean out the mixture and cause overheating. The oil has displaced the gasoline, which is the same as decreasing the jet size, less gas = leaner mixture. Additionally with less gasoline there is less evaporative cooling. The evaporation of gasoline on hot parts does a tremendous job in keeping the components cool. Further the specific energy of the oil is likely to be higher than that of gasoline, again a hotter burn...so all around pretty much too much oil and not adjusting the jetting to suit can lead to a lean condition, and lean conditions can manifest as overheating.

This is a classic example of people who see it fit to add more oil to their engines when they are breaking in a new top end and do not adjust to that additional "helpful" oil. It's not all that a bad practice to do, but you HAVE to adjust your jetting to suit.

Now as for a thumper that is overheating with too much oil. The other guys have got it...
 
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