[68c10owner]

Per the article you listed,

The last point in the cycle is the intake closing. This occurs slightly after Bottom Dead Center, and the quicker it closes, the more cylinder pressure the engine will develop. You have to be very careful, however, to make sure that you hold the valve open long enough to properly fill the chamber, but close it soon enough to yield maxi mum cylinder pressure. This is a very tricky point in the cycle of the camshaft.

Seems its closed a little sooner than you think.


For 25 years I was told you needed to match the cam with the compression until a few weeks ago when I had a discussion with Chris Straub. He is the one who told me you dont cam for compression, you cam for the desired RPM range. Since its his job to design camshafts its hard for a hobby builder like myself to argue with a man who is very well known for his camshaft knowledge.