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Old 08-04-2010, 09:29 AM
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Cam duration vs. Cam lift

Hey! just wondering on the effects of a high lift cam will have on idel quality, i know more duration will give you the lopey idel, but im looking to upgrade to a cam with around the same duration and more lift.

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Old 08-04-2010, 09:47 AM
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more lift lets in more air and makes more power.

more lift doesn't effect idle quality.

However, more lift can effect valve train durability. More lift equals more stress on the lobe, lifter, rocker-arms, and springs.

also, depending on how much lift, you need to be concerned with piston clearance, spring stacking, and retainer to seal clearance.
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Old 08-04-2010, 12:16 PM
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Increased lift from say a 1.5 rocker to a 1.6 will effect duration, how much this has an effect on idle characteristics is anyones guess but there will be some influence on the effective duration. Changing the cam is changing the cam so all other factors such as ramp rate, lobe sep etc etc is in play which may change the idle lope, finding a cam with everything exactly the same as the next except for lift? maybe,,,maybe not out there
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