Originally Posted by
Epstein
Also, someone talk about area under the curve limitations on pushrod motors. I want to say that I've read you have to have really shallow ramp angles to keep the pushrods happy, thus requiring the huge lifts/durations and high flow rates to actually get a decent amount of air into the motor. Might be talking out my ass here, though.
In order to acheive peak flow in an OHV you have to have alot more lift because of 2V heads having more shrouding. With a 4V head because the smaller diameter of the valves and the fact that they take up more of the combustion chamber they have less shrouding, in terms resulting in not needing to achieve a shit load of lift and less stress on valve springs.
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Last edited by B18C5-EG; Oct 6, 2009 at 04:14 PM.