Internally or externally balanced crankshaft ?

[gn87man]

I am rebuilding my engine and I believe I need to purchase the externally balanced crankshaft.

I have attached a picture of my flywheel and harmonic balancer.

The harmonic balancer looks to have a weight attached to one side.

I assume this means the rotating assembly is externally balanced?

Thoughts?

Thank you so much in advance.

 

[Quick6'n'-K.C.]

Yup
If you went aftermarket internal then the balancer would not be counter weighted

 

[gn87man]

Yup
If you went aftermarket internal then the balancer would not be counter weighted

Thank you sir!

 

[~JM~]

Would this be a good time to upgrade to an internal balance crank?

I realize that it may cost more, but is there enough benefit to be worthy of the expense.

 

[gn87man]

I am debating whether it would be worth the extra cost at this point.

I believe the internally balanced crank was about $120 more than the externally balanced crank. These were cranks that I priced online from this forum's vendors.

What kinds of benefits would the internally balanced crank give me?

The motor currently has the stock crank, which obviously is externally balanced.

 

[Jerryl]

From pure cost perspective:
The flywheel and ring gear are not cheap so, it's a bit more than $120 in the end.

Don't really know if there is a real benefit at power levels that will crack a 109.

 

[gn87man]

From pure cost perspective:
The flywheel and ring gear are not cheap so, it's a bit more than $120 in the end.

Don't really know if there is a real benefit at power levels that will crack a 109.

Thank you!