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Old 03-23-2006   #5
1ViciousGSX
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Join Date: Oct 2003
Location: Sportsman's Paradise, LA.
Posts: 5,382
Re: Did a compression test tonight.

Quote:
Originally Posted by tim
Yeah, I was thinking about that a little more last night after I posted. I would think though that the late closing of the valve would be offset by the extra lift and it wouldnt really affect compression much.

Maybe not, it just seems to make sense to me.
At cranking speeds, lift has no real effect. The air flow is way too slow for lift, duration or port velocities to make a difference. It's only mechanical closing of the valve in relation to the piston's travel that will change compression at this point.
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