Reply to "Idle Rumble"

George PAdmin.

Its a combination of camshaft design (valve timing) and cylinder head design.

In terms of cam design it can be either the amount of overlap or how early the intake valve opens that create a rough idle. In terms of cylinder head design the shallow combustion chambers and large valves of the Cleveland engine produce a bit of a rumble at idle even with very mild overlap. This is because those aspects of the cylinder head amplify the effects of overlap. The 351C makes more top end power with 50° of overlap than most engines make with 65° to 70° of overlap.

1/30/183:14 PM

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