no the dwell time in that situation wouldn't change. At least not in relation to the piston speeds. With the desdomonic, it seems like it forces the valve to always be moing, so you can't have the flat part of the profile. the cams need to be able to spen the entire compression and expansion stroke (in the basic sense ignoring valve tuning isues) sealed shut. If they don't, you leak compression. the desdomonic looks a lot like the crankshaft on the engine, and that never really spends any time at TDC or BDC, its always moving
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