Quote:
Originally Posted by pothole
Moreover, the thing the low temp stat is advertised as being preventative for is bore scoring on some of the larger M97 engines, which is supposedly a problem related to very high temps and hot spots.
But I am at a loss as to how it does this since at higher temps, there's no difference between the two stats.
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Easy, when the coolant in an M96/97 is running 210F (99C in your world), a commonly observed steady state driving temp when measured with accurate instrumentation (which the dash display is notoriously not); due to the rather intricate cooling system layout in these engine cases and cylinder heads, there are areas of the engine that are often 20 to 30 degrees F warmer than the observed coolant temp due to restricted coolant flow. This leads to prolonged alloy component distortion and is one of the principal reasons these engines are prone to both cylinder head cracking and cylinder wall problems. Throw in faster oil degradation and you have a potential issue..........
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