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Ol' Ron · 08-04-2020, 06:48 AM

The actual compression an engine sees is after the intake closes. It's called "dynamic CR" and is a good reason Long duration cams don't have allot of torque at low RPMs. The volume of the combustion chamber determinees the "Static CR". This includes the area over the valves. High lift cams need a place to put the valves when they open. Remember Horsepower needs air to make HP amd the combustion chamber is part of the intake port when it has to provide the AF to reach the piston. With all the Mathematical skills of our readers, determine the chamber volum you need to make 12:1 cR in a 276 engine, now a 350 ci.. This is the reason blowers make allot of HP

08-04-2020, 06:48 AM	#82
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Let's build a drag race 8BA engine The actual compression an engine sees is after the intake closes. It's called "dynamic CR" and is a good reason Long duration cams don't have allot of torque at low RPMs. The volume of the combustion chamber determinees the "Static CR". This includes the area over the valves. High lift cams need a place to put the valves when they open. Remember Horsepower needs air to make HP amd the combustion chamber is part of the intake port when it has to provide the AF to reach the piston. With all the Mathematical skills of our readers, determine the chamber volum you need to make 12:1 cR in a 276 engine, now a 350 ci.. This is the reason blowers make allot of HP