balancing the flywheel?

Rune

Bronze Supporter
#1
I made my own flywheel exact like the original ones from the 60's but I belive I have to balance the flywheel .
Can this be done as a stand alone? or do I have to use a crankshaft and the harmonic damper to get the right balance. I think the old original flywheel drawings was correct, but I have to know.
Look on my build tread to see the flywheel (last page)
Someone have done this before?

Thanks Rune
 

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Jac Mac

Active Member
#2
In your case where using all new or built parts you must get the whole assy balanced with damper/crankshaft(with bobweights calculated using your rods-piston-ring weights)/ and flywheel. Once balanced as a unit like that have them attach the front crank pulley and clutch assy and check it as well.
 

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#3
Hi Rune,

The flywheel that you have made is probably machined for an imbalance of 28oz so you must have the correct crankshaft and harmonic dampener from an engine built with a 28oz imbalance. Later engines have a 50oz imbalance.

289s all have 28oz, 302s up to 1980 have 28oz and 302s made between 1981 and 2001 have 50oz.

Regards,
 

Rune

Bronze Supporter
#4
Graham I know it is machined for 28oz imballance , but is the original drawings correct enough to use the flywheel without a check ? I plan to put a fabric flywheel in a balancer machine first and zero the machine , and then take my flywheel into the same machine and see if it have a offset from the fabric one.
 
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