Yessss, cam profiles are a challenge aren't they ? Dont worry though, I have been mechanicing for 30 odd years and I am still learning new tricks. The latest one being the term dynamic compression ratio, This more accurately describes whats happening in the engine cylinder in the real world.

Now I have to do other things at the moment, but concentrate on the fact that you do not get compression untill the cylinder is sealed. Then I will get back on line with a number of different combustion chamber and cam profiles with a nifty formula, the results could be quite intriqueing. S