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lx5091 · 10-13-2002, 04:09 PM

thanks, makes sense

What is the relationship of intake and exhaust port sizes to the size of the combustion chamber.

What I mean is GT-40X's with a 58cc combustion chamber flow 240cfm @ .550 lift utilizing 1.94" intake and 1.54" exhaust valves.

While the afr 185's with a 58cc combustion chamber flow 273cfm @ .550 lift utilizing 2.02" intake and 1.60" exhaust valves.

Are the AFR 185's with a 58cc chamber overkill? Do you need valves that big with this size chamber?

Better yet, what is the maximum size valves neccessary to fill a 58cc chamber on a naturally aspirated motor? Could an intake keep up (any brand)? Or is that even the point?

10-13-2002, 04:09 PM	#3
lx5091 Registered Member Join Date: Nov 2001 Location: Fall River, MA Posts: 467	thanks, makes sense What is the relationship of intake and exhaust port sizes to the size of the combustion chamber. What I mean is GT-40X's with a 58cc combustion chamber flow 240cfm @ .550 lift utilizing 1.94" intake and 1.54" exhaust valves. While the afr 185's with a 58cc combustion chamber flow 273cfm @ .550 lift utilizing 2.02" intake and 1.60" exhaust valves. Are the AFR 185's with a 58cc chamber overkill? Do you need valves that big with this size chamber? Better yet, what is the maximum size valves neccessary to fill a 58cc chamber on a naturally aspirated motor? Could an intake keep up (any brand)? Or is that even the point? __________________ '02 Explorer XLT 4.0L --Nice Vehicle '97 Saturn SL1--Soon to be ditched for a Ford! Last edited by lx5091; 10-13-2002 at 04:32 PM..