Thread: Harmonic balancer choice

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Hi all.

How do I tell what harmonic balancer I will need for my engine? What size will I need? Why do they have different sizes? Below is the rotating assembly I plan to use.

BTW, this is a Eagle rotating assembly
Crank: Cast
Rods: I-beam
Bearings: Clevite 77
Stoke: 3.750
Displ. @0.030: 383
Rod Length: 6.00
Pistons: -16cc SRP forged
Rings: Perfect Circle (file fit)
Compression Ratio:
@58cc:10.4:1
@64cc: 9.8:1 (This one)
@76cc: 8.7:1
Bore Sizes: std,.020,.030,.040,.060
*Internally Balanced* *Does not include flexplate (153 or 168 tooth) or dampener*

Thanks for your time,

-Chris.

Originally Posted by dhemi1

Hi all.

How do I tell what harmonic balancer I will need for my engine? What size will I need? Why do they have different sizes? Below is the rotating assembly I plan to use.

BTW, this is a Eagle rotating assembly
Crank: Cast
Rods: I-beam
Bearings: Clevite 77
Stoke: 3.750
Displ. @0.030: 383
Rod Length: 6.00
Pistons: -16cc SRP forged
Rings: Perfect Circle (file fit)
Compression Ratio:
@58cc:10.4:1
@64cc: 9.8:1 (This one)
@76cc: 8.7:1
Bore Sizes: std,.020,.030,.040,.060
*Internally Balanced* *Does not include flexplate (153 or 168 tooth) or dampener*

Thanks for your time,

-Chris.

If it is an internally balanced engine you need to run a 350 balancer and 350 flexplate.
If it is ext. bal. you need to run a 400 balancer and 400 flexplate.

Yep, but what size? I can go with a 6.325" or 7". Does it matter?

-Chris

Originally Posted by dhemi1

Yep, but what size? I can go with a 6.325" or 7". Does it matter?

-Chris

For a street car I would run the larger dia. to help reduce more of the harmonics.

ah I c. Thanks Eric!! I was wondering what the different sizes meant. lol its so obvious now

-Chris