Q: what is the diameter of exhaust ports in H22? Maybe someone has a head lying around...

I heard a rule that while planning the exhaust pipe diameter it should not be more than twice of exhaust port diameter. Applies to NA of course... Anyone can confirm that (or decline)? What is the general rule when constructing a new exhaust system for pipes then?

pentaq

 

2 and 1/4" and a test pipe is plenty of flow for a N/A setup