LSA Question

Dale Davies said
Do not forget the main person here is the person that asked a question, the OP. For cam selection he is a neophyte, so KISS is required. This is why I recommended he watch DV's cam select videos or get a copy of How to Build Horsepower.
For more experienced builders we can get down and dirty with opening and closing events, and the whys.

I understand...

I'm trying to correct mis-information from getting passed along and someone falsely believing it...

I was replying to pentastar's post that tighter lobe center will make more cylinder pressure with the intake valve closing when they are not related... The OP's question was about lobe separation, not intake valve closing... I don't agree with him responding to my reply on lobe separation that tighter lobe separation will make more cylinder pressure - that's incorrect... Tighter LSA will make lower cylinder pressure than larger LSA because of more overlap of the intake and exhaust valve open - it's simple physics...
Stating that tighter lobe separation will make more torque because of earlier intake valve closing is like asking "do you walk to work or pack a lunch"... :wtf:

Larger lobe separation with early intake valve closing will make the higher cylinder pressure and more torque... If you make the lobe center smaller and the intake valve close later, that will decrease cylinder pressure and reduce torque...

Intake valve closing is completely independent of lobe separation and can be moved to achieve any intake valve closing that you wish... Intake valve closing and lobe separation work together to determine the cylinder pressure of an engine...

I've done cam calculations forward, backward, inside out, and upside down and found errors and conflicts with many cam manufacturer's published information and corrected it in my charts... I have tried to simplify the question that he's answered and break it down to basic physics and the math on how those parameters will affect the performance of the camshaft and explain it in layman's terms...