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Author
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Topic: Mismatched Flexplate/Balancer
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Kellxr7
Gearhead Posts: 495
From: Canada
Registered: Mar 2003
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posted 07-27-2004 09:28 AM
   
I have a freshly rebuilt (1991) 302 that has the 50oz harmonic balancer, when I bolted it up to my C4 I had put in the original 28oz flexplate that was with that C4, when the car was running it obviously had some vibration, What I am wondering is, how long would it take until this vibrating would wear out the main bearings etc? (Just a note, oil pressure is normal and hasnt changed) I didnt put many miles on the car as I was obviously concerned about the vibration, so it is now parked & has been for about a year. I recently purchased the correct motorsport 50oz/C4 flexplate, My question is am I ok to change the flexplate & keep on rolling or is this motor now a ticking time bomb?[This message has been edited by Kellxr7 (edited 07-27-2004).]
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Rustang
Gearhead Posts: 646
From: Clarion PA
Registered: Nov 2000
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posted 07-27-2004 11:51 AM
Depends on your sign, alignment of the stars, etc..One time we ran a 351C in a dirt track car with a 0 balance flywheel from a 300-six for 2 seasons and never had a problem. However, I suspect people have pounded bearings out in a matter of minutes too 
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Moneymaker
Administrator Posts: 22719
From: Lyons, IL, USA
Registered: May 99
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posted 07-27-2004 07:27 PM
You should be fine.
Not enough power to hurt anything.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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popeye
Gearhead Posts: 173
From: Dixon, IA USA
Registered: Dec 2002
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posted 07-27-2004 08:21 PM
we were in the water box with the motor revving at 5500 rpm s at cordova when Jason heard a loud bang and felt a major vibration.He shut it down right away and I ran over to see why becuse I did'nt have a clue as to what had happened.The next day we found out the flexplate counterweight had come loose and hit the starter and bell damaged both but thats all,everything else was untouched,replaced the bell,flexplate and fixed the starter.That winter,after finishing the race season,we pulled the pan to check the bearings and they looked great.So dont worry you'll be fine. 
popeye ------------------
This is FORD COUNTRY, where on a quiet night, you can hear a chevy rusting
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Kellxr7
Gearhead Posts: 495
From: Canada
Registered: Mar 2003
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posted 07-29-2004 08:32 PM
Thats better news than I thought I would hear  I will keep a close eye on the oil pressure tho, just in case.
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