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Author Topic:   Engine Balancing help please

Posts: 107
From: Seattle
Registered: Oct 2001

posted 11-24-2001 12:18 PM     Click Here to See the Profile for badazzcougar   Click Here to Email badazzcougar     Edit/Delete Message   Reply w/Quote
Heres my dilemna .. I have a 1972 vintage 351 cleveland engine. It was rebuilt by a reputable builder a few years ago . The guy I bought the car from had the work done . I am in the process of rebuilding the motor at this time to add more compression, change the cam and heads and generally freshen it up for the spring. Anyway it appears to have been internally balanced. There is considerable weight removed from the rods balancing pads and there is quite a bit of weld metal weight added to the crank counterweights. I made sure to keep the new piston weight the same as the old but where my problem lays is in that the flex plate is made for a internally balanced engine. Ever since I bought the car i have had a vibration problem and when I pulled the motor I noticed that the welds along the outside of the flexplate where the balance weight are were cracked. I understand there are different flexplates for cleveland motors. Do I need a internally balanced flexplate or do I need the externally balanced. I dont even want to ask the guy I got it from as he was a yutz and couldnt mechanic his way out of a wet paper bag and I'm pretty sure he wouldnt know the difference between internal balance and external balance.

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Posts: 10026
From: Lyons, IL, USA
Registered: May 99

posted 11-24-2001 01:44 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
See reply on the racing forum.

Alex Denysenko
Co-Administrator and Moderator
NHRA and IHRA SS/LA National Record Holder '00 & '01
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