Posted by RAB on March 13, 2008 at 09:44:32 from (195.93.21.134):
In Reply to: 12 valves? posted by Dan-IA on March 13, 2008 at 07:21:36:
It is all about reciprocating mass and gas flow, plus a few other factors.
Two small valves will be better than the largest they can get in the space. Valves have to be opened against a spring (generally) and this takes power. One big valve closing needs strong springs and often double springs. Lighter valves are more easily controlled at higher engine speeds.
Gas flow can be improved with two smaller valves rather than one large one - more area and disribution into the combustion chamber can be improved.
Other things like cooling the valves (exhaust) and valve timing alterations as well as rate of lift can all have benefits.
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