Daeron Posted March 5, 2009 Share Posted March 5, 2009 As usual Tony, thanks for explaining something nobody else has taken the time to explain the nitty-gritty details of. Just goes to show you the difference between professionals and amateurs. I never even thought to consider the different ways the pressure can build. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted March 5, 2009 Share Posted March 5, 2009 An infrared spectrophotometer is typically needed to analyze the fart gas for content. It is inversely proportional to the compression differences between cylinders. Quote Link to comment Share on other sites More sharing options...
Pyro Posted March 5, 2009 Share Posted March 5, 2009 Late closing intake valve from a long duration cam lowers cylinder pressure. On the compression stroke, the intake valve is still open as the piston is rising in the bore, so no air is captured until the valve closes which lowers cranking pressure. (less air to compress). This is called dynamic compression ratio (DCR). A stage 3 MSA cam should use a L28 with flat tops and a N42 or N47 head. Quote Link to comment Share on other sites More sharing options...
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