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Vibration update

October 11 2017 at 4:49 AM
John  (Login johncougaruk)
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I've had some really good news from my latest (third) engine builder. History is that I had a bad vibration from my 428.

As I suspected (or at least one of my suspicions) the engine, when originally built 15+ years ago, had been internally balanced and I bolted a weighted 428 flex plate to it unaware of the internal balancing.

The bad news is that there was a lot of shrapnel from the wiped lobes still in the engine despite it been stripped down for the new cam by the last builder. All I plan to do is to take of the weights the from the flex plate and re install.

Regards

John

 
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AuthorReply
Pete
(Login 427funn)
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More to it

October 11 2017, 8:50 AM 

I would check the bearings,I have seen it before,bearings are probably shot

 
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Tom P
(Login tomposthuma)
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weights

October 11 2017, 9:39 AM 

Don't go cutting off weights, get a 360-390 flexplate and try that. If it makes it worse you may need to put that back on.

Unless it's a bent crank snout or mangled lower pulley the internal balance thing is probable... but it will show with added weights in the crank.

 
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John
(Login johncougaruk)
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re-build

October 12 2017, 4:28 AM 

Thanks for the responses.

The engine is being treated to line honing with new bearings before it gets balance checked again.

I'll get a 390 flexplate for it and hang the 428 one on the wall as a reminder never to assume and always talk to my engine builder in the future.

hopefully I'll be a forum member with an FE powered car finally after 15 years!

Regards

John

 
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