Quote:
Originally Posted by 02Pilot
So as a mechanical engineer, you do not believe that a ~50F difference in temperature will have an appreciable effect on the rings' ability to seal, even though the tolerances are measured in thousands? And what is it in particular about the specified operating temperature that is problematic other than being higher than traditionally expected for internal combustion engines?
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No. Every car see a difference of a lot more than 50 degrees every day...piston ring temp might go from a low of 40/50 degrees at startup to 600 degrees at full operating temp...the slight expansion of rings & pistons over this wide temp will not affect cylinder sealing nor accelerate wear beyond normal. Nonetheless, I consider a 25-30 degree drop in operating coolant temp to be beneficial in maintaining engine compression, reducing component stress, and a very lean fuel ratio, especially when that excessive temperature is emission related.
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