Guest greimann Posted December 7, 2002 Share Posted December 7, 2002 Does it make sense that a high compression motor (like 10.5:1) would have a propensity to consume oil due to it drawing a higher vacuum on closed throttle deceleration than a motor of lower compression ratio? Logically, if high compression creats higher cylinder pressure under open throttle, then the same piston / cylinder geometry should creat greater vacuum under closed throttle. Anyone ever heard of this relationship? Quote Link to comment Share on other sites More sharing options...
johnc Posted December 9, 2002 Share Posted December 9, 2002 The propensity to consume oil in this situation would have more to do with the condition of the valve seals and guides then compression ratio. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted December 10, 2002 Share Posted December 10, 2002 Ditto what johnc said, but I would question the assumption that a high compression engine will draw a higher vacuum during deceleration. The compression ratio can be increased by milling the head to create a smaller combustion chamber. However, I wouldn’t expect this to affect the vacuum in the cylinder during the intake stroke since this is more a function of the valve timing and the flow capacity of the intake path. Changing the volume of the combustion chamber shouldn't affect this. Quote Link to comment Share on other sites More sharing options...
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