turbogrill Posted September 25, 2018 Report Share Posted September 25, 2018 Hi, My engineis a SOHC Nissan L28 (rocker arms). I have found a cam that has a very large adv duration but the 0.050" duration is pretty mild and has a nice lift. I assume that this means that it's nice on the valvetrain but it might bleed of some compression since when the piston is moving up the intake valve has not fully closed yet. Having a low compression to start with will make things worse. How much does this matter on a race car? As soon as the engine approach torque max (high VE) there will still be gases flowing into the engine even after BDC (due to reversion and what not) so having the intake valve open even if the piston is heading up is not bad. Gases are still flowing in. Or is that the ideal case? In reality at some point the piston will still push out some gas out of the slightly open valve and compression is lost? (Close to intake valve is closed). Quote Link to comment Share on other sites More sharing options...
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