07-04-2005, 10:07 AM
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CC Member
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Join Date: Jul 2005
Location: butler,
mo
Cobra Make, Engine: B&B 351w
Posts: 4
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Not Ranked
Unusual vibration at 2100 rpm
Hi,
I have a 351w in my cobra with about 500 miles on it. It has a mild cam, electric fan, HEI ignition and no air or power steering . I have a vibration that I can feel precisely at 2100 rpm.
It is present in any gear, accelerating or cruising or decelerating, standing still or moving, clutch in or out.
I think it has always been there. It is not super-strong but noticeable enough to try and get rid of. The engine runs strong and it doesn't seem to be a typical miss.
Anyone have any leads or tests for me to try? Doesn't appear to be a pulley. Some friends have suggested a weak motor-mount, an unbalanced flywheel or unbalanced pressure plate, a spark problem or a bad harmonic balancer.
Thanks for your help. -Al
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