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I asked Elgin about a dual pattern...he said it was unnecessary...What's your reasoning?
The exhaust port flows very poorly relative to the intake, that's the main reason for running extra exhaust duration with any engine, Also, you are running high compression, so you can open the exhaust valve earlier to reduce pumping losses because the mixture burns faster. (Low compression motors are slow burners, you have to open the exhaust port later with those)
Modern engines with four valve heads have so much exhaust flow that they can & do have less duration on the exhaust than the intake.
Now that the rich uncle died...maybe I should get a cam from you, one from Phil S., one from JP, and do some testing... because Phil commented to me privately "They think they know everything, and none of us actually do. No one does."
I'd simply specify a cam from Elgin, since that is the easiest way for you to get a cam, so if you want to do a back to back comparison, he'd be grinding both. The one I would use would be very similar to the VPD SP Cam if you are intending to use stock, unmodified D-Jet. There probably wouldn't be much difference between the four different cams, but I know mine would last longer & have less chance of flattening a lobe.
What specs did Phil recommend?
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