The Choppy Cam Sound

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Jul 14, 2007 | 06:55 PM

ChrisUlrich

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The Choppy Cam Sound

How come you hear the chop of a cam at idle... but not at higher rpms?

Jul 14, 2007 | 07:16 PM

Daryn

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From: gonzales louisiana

when i put my 224/224 112ls1 in my z28 it sounded beastly , only becaust the valves were overlapping and it was misfiring on a few cylnders at idle

Jul 15, 2007 | 01:13 AM

ERIK@MASPORT

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Quote:

Originally Posted by ChrisUlrich

How come you hear the chop of a cam at idle... but not at higher rpms?

Because the valves are opening and closing too quickly at higher RPMs to hear the individual cylinders firing like you can at idle

Erik

Jul 15, 2007 | 03:40 AM

Asmodeus

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From: Naperville, IL

Quote:

Originally Posted by ERIK@MASPORT

Because the valves are opening and closing too quickly at higher RPMs to hear the individual cylinders firing like you can at idle

Erik

Yep, that's also because the exhaust is able to scavenge the blown charge at higher RPM.. where-as at idle, you are basicly choking the intake charge with dirty air getting into the intake manifold through the valve overlap because there's no exhaust velicty to pull the spent charge out of the combustion chanber.

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