Quote:
Originally Posted by k1w1t1m
This is what makes me think cam timing. The most resistance should be just before the exhaust valves open.
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I think you're right, however the most resistance is on the compression stroke, and both valves remain closed, then. So "just" meaning, after the piston goes down from the compression.
The exhaust valve should then remain open until the piston is at the top again. That is when the inlet valves should start opening. And the inlet valves should close when the piston is down again. Then, all valves should remain closed when the piston goes up, to the compression.