What is the formula for determining Intake Valve Closing angle in the Compression Ratio Calculator?
The “Formula” is quite complex (many formulas actually) and has to do with our Cam Profile Designer routines. At .050 tappet lift, the valve may still be .100 ” off the seat (not closed). For Dynamic Compression ratio you want to know when the valve is ON the seat so pressure will start to build in the chamber, which changes with profile type, Hyd vs Solid lifters, Lash, etc. for a particular intake closing at .050″ tappet lift. If you know the intake closing at .000 valve lift (seated timing), you should enter it directly. (The .006″ lash point is used for hydraulic lifters because they are assumed to have about .006″ effective lash.) Back to Top Why does the Engine Analyzer and the Engine Analyzer Pro give different results for detonation (spark knock)? The 2 programs work differently: EA30 retards spark to not allow detonation to occur. EA30 does not report detonation level, just spark advance. EA Pro runs the spark curve you give it or one it believes will produce best power and ju
