Vibration in an A

Kevin in NJ said:
FWIW,

At one time it was told to me from a reliable source that more than one NOS flywheel was checked and found to be out of balance. All the flywheels were known to be post A era Ford production.

So a NOS flywheel in a later 30's or 40's box may not be properly balanced.
Click to expand...

Maybe, back then, Ford's balancing technology and equipment was not as accuarate as today's.
 
The flywheel / pressure plate / clutch disk assembly that I got from Ron Kelley weighs 20# less than the same original assembly.
 
Tom Wesenberg said:
I often hear the flywheel is balanced to a certaiin gram weight, but at what distance is this?:confused: Thanks
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Tom: Our machine requires you input the radius of the flywheel plus area you are removing from .
With that the machine knows the amount and weighs accordingly for the material to be removed.

See the picture as a stock model A flywheel resurfaced and with new ringear and pressure plate installed. The unbalanced weight at 71.76 grams, then corrected balance weight at .3 tenths of gram @ 4000 RPM. Moving the dynamic to a point beyond the range of normal engine operation.
http://www.jandm-machine.com/balancing.html
 

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I had my stock flywheel, pressure plate and ring gear balanced and my car now has ZERO vibration at all speeds, it is like a different car and is so much more enjoyable to drive now.
 
However you balance the flywheel, it helps. I have a NOS original flywheel that is out of balance and it has never been surfaced or had a clutch on it. I don't remember how much out it is but, it is out.

I have seen the machine Ford used and it was somewhat like the bubble balancers we used to use for wheels. It worked but not like a computerized dynamic balancer of today.
 
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