engine vibration - Team Camaro Tech
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post #1 of 6 (permalink) Old Jan 27th, 08, 07:05 PM Thread Starter
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engine vibration

If an older flywheel was used on a newer externally balanced crate engine how bad would the vibration feel? Would the vibration be felt across the rpm band or a certain rpms? I'm trying to track down a vibration that seems to be engine related. Thanks!
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post #2 of 6 (permalink) Old Jan 27th, 08, 08:00 PM
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Re: engine vibration

I dont think you can even get an older flywheel to fit correctly as the older has a 3.50" crank flange snout and the newer has a 3". You will have a heck of a time lining it up. Most all older motors were internal balanced. Which motors are you talking about?

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post #3 of 6 (permalink) Old Jan 27th, 08, 08:23 PM Thread Starter
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Re: engine vibration

The engine in it now is a 350 crate (CC code). It has the one-piece rear seal and should be externally balanced. The original engine in the 68 was a V8 (327).
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post #4 of 6 (permalink) Old Jan 28th, 08, 04:32 AM
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Re: engine vibration

As Don suggested, one-piece rear seal require a different bolt pattern than a two-piece seal.

If one were to have adapted and mixed the two, the vibration would be such one would not be able to read the speedo. The engine will not last long under this condition, rear main bearing will be wiped out.

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post #5 of 6 (permalink) Old Jan 28th, 08, 05:41 AM
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Re: engine vibration

Check for crossed plug wires

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post #6 of 6 (permalink) Old Jan 28th, 08, 12:55 PM
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Re: engine vibration

And to add to what Tim said, (don't yell at me Tim!) also check for crossfire. That's one plug wire firing the adjoining wire because the wires are next to each other for a substantial distance. (I think the effect is caused by induction) I forget which wires are the culprit on a Chevy, 7&5???? Hey, it was an Autoshop lesson in 1964 so I'm a little foggy. Besides, it was the 60's! Anyway, it's best to keep 'em apart and not parallel.

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