Re: [AMC-list] engine balancing

[Davis Martin <martin-davis@xxxxxxxxxxxxx>]

Very simple, You must figure out if it was internally or externally balanced. A good local machine shop will be able to tell from the flywheel. Bring it to them with a new flexplate for the tranny you will be using, 727 or th400, They can match balance the new flexplate to be the same as the flywheel. No need as suggested to rebalance your engine. Matchbalancing has been done for years without issue. Just tell the shop what you are doing and they can take care of it for you. The trouble is when folks figure they can do it at home by removing weights. It should only cost you about 60 bucks.
 Good luck,
 Davis  

--- On Fri, 6/12/09, Armand Eshleman <aje1@xxxxxxxxxxxxxxx> wrote:


From: Armand Eshleman <aje1@xxxxxxxxxxxxxxx>
Subject: Re: [AMC-list] engine balancing
To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxx>
Date: Friday, June 12, 2009, 8:50 AM


Dan,

I had this exact procedure done but in reverse. The flex plate's out of
balance condition was out of balance matched on the flywheel at a machine
shop nearby my home. This shop was the only one that didn't cringe in fear
when I mentioned AMC or the procedure. The shop did need the correct donor
crank and piston, rod, ring asembly for a guide point. They got a base
reading and zero balanced the crank, rod, piston ring assembly then match
balanced the flywheel to the flex plate. The engine runs very smooth. They
did an excellent job. Any machine shop that knows it's stuff should be able
to do this procedure for you.
If you don't do at least this much, (it's actually best to rebalance the
mating assemblies), your fresh 390 may shake itself apart.

Armand




> Dan,
> Did you have the 390 NEUTRAL BALANCED, or balanced to the stock 390
dampner and 390 Flywheel? This will determine exactly how the Spirit
flexplate should be balanced. If you don't know the answer, you could take
the 390 Flywheel AND the Spirit flexplate to a reputable shop and they
should be able to 'match' the Flexplate balance to the 390 flywheel balance.
>
>

>
>
>
>
>
> I think I know the answer to this question but need to ask anyway. I have
the 390 for the AMX, this has been rebuilt and according to the receipts has
been balanced. I'm going to put this into the Spirit as long as the AMX
isn't done. Now the question, the AMX is a 4 speed and the Spirit is an
automatic. I should just have to take the weights off the flywheel to make
it work on the 390, correct? I have a conversion for the 390 to a newer
transmission already.
>
>
>
> Thanks in advance
>
> Dan Whitehead
>
> _________________________________________________________________
>

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