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Old 11-28-2012, 06:22 PM   #2
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Join Date: Aug 2009
Location: Ontario Canada
Posts: 966
My Ride: 1999 328i (M54b30)
Do the valves not close as you rotate the engine? They must or they would be bent. Given that the firing order goes from 2 to 4, it makes sense that they would both have their valves open to some extent at the same point in the cycle.

Last edited by jared_wiesner; 11-28-2012 at 06:32 PM.
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