what kind of balancer - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 16th, 01, 09:30 AM Thread Starter
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Chuck
 
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i have a question. I believe that i may need to replace my harmonic balancer. I have vibration at high rpm's. my motor is blueprinted and balanced, and when i shut the car off the vibration goes away. so the balancer is the only thing that makes sense. there are only 6000 miles on the motor, but the balancer is very old. What i want to know is what is the right balancer for this car. do i need an aftermarket? It currently has an 8 inch balancer on it, is this what came on a 350? i didnt think it was because i had to cut/modify a powersteering bracket to make it fit around the balancer when i added the option. Will a balancer from autozone work, and do i want to go with the 8 inch for performace purposes (motor has 10:1 trw's and a moderate cam)?

Any advise will be greatly appreciated.

Chuck

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post #2 of 7 (permalink) Old Apr 16th, 01, 09:38 AM
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How much of the engine was balanced when it was built? Was the balancer, flywheel and clutch included or not? Problem could also be in the flywheel or clutch if they were not balanced as part of the assembly. If the engine was internally balanced all by itself (no offset weight on the balancer or flywheel), you're in luck and should be able to replace the balancer with a new zero-weight part; however, it may be the flywheel or clutch. Need more history on the pieces to make a recommendation.

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post #3 of 7 (permalink) Old Apr 16th, 01, 11:16 AM Thread Starter
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not sure if this will help seeing as how i dont know how the motor was balanced. I believe that the motor was balanced with the harmonic balancer, but i do know that the flywheel is weighted on one side, and drilled on the other. motor is mounted to a th400. The motor was in plastic when i got it, pistons in a box waiting to be put together. (came with the car) if it was balanced with the flywheel, will this cause me problems if i decide to put in a t56 later? What other problems might arise should i try to put a new balancer on if the motor was balanced with the balancer on there? I know that the motor was balanced because the connecting rods were machined and brazed, and stamped with their cylinder locations. if more info is necessary i might be able to contact the man that i bought the car from.

Chuck


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post #4 of 7 (permalink) Old Apr 16th, 01, 12:32 PM
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did it always vibrate? If you described the flywheel correctly there is something wrong there a 350 is neutral balance meaning the flywheel should not have any weights or large amount of holes in it.Are you sure there is brass on the rods this is something new to me you definately don't want that much heat on a rod.

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post #5 of 7 (permalink) Old Apr 16th, 01, 07:13 PM
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Torque converters I hear should be balanced also.

Good Luck on the t-56, I wanna get one too. I just might settle for a 5 speed even if I can get one cheap.
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post #6 of 7 (permalink) Old Apr 16th, 01, 08:01 PM
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torque converter's are balanced when built, and to a great extent are self balancing, they are fluid filled. it is impossable to balance a rotating assembly with a torque converter on it, as once filled with fluid it will be self balanceing.

normaly you get a roataing assembly balanced with the harmonic balancer and flywheel/flex plate. if all the part's are static balanced and are in spec's a dynamic balance is not nessary if the motor will not see abouve 6 grand very much you probably do not need a dynamic balance.

when GM build's new motor's all the part's weight with in a certain spec, they do not get balanced. for year's a lot of rebuilder's just made sure the piston and rob's weight was ok and that was it.


are your motor mount's good? trany mount? all so check the flex plate/fly wheel mounting bolt's and clutch/torque converter bolt's. oh and the tranny bellhousing bolt's.

if you want to repalce the harmonic balancer get anthor 8" one with apropiate timing mark on it. it will work. IMHO i feel the largest harmonic balancer you can run is better. david vizard is of the same mind as me on this, so are some other pro engine builder's. there is all so a group that say use the smallest you can. so i guess it is what you think in the end. me i would stay with a 8", most 350's use a 8" balancer when new from GM.

if you have a externaly balanced motor, like a 400SB or a most 383SB you use a biferant flex plate/flywheel and harmonic balancer then other SB's.
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post #7 of 7 (permalink) Old Apr 17th, 01, 04:30 AM
 
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cfry,
just a side note. The 8in balancer used a different ps bracket than the smaller balancer. The SS350 and Z28 used an 8in balancer. The 327 used 6 3/4 balancer. You probably have 327 ps brackets.
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