Difference..Crank hub vs Balancer on small block?? - Team Camaro Tech
Tech 2001 General Tech questions from 2001
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post #1 of 2 (permalink) Old Oct 22nd, 01, 04:21 PM Thread Starter
Senior Tech
Join Date: May 2001
Location: Mass
Posts: 252

Can someone explain the difference between a balancer and a crank hub..I have read that on blown engines balancers are not recomended..That the use of crank hubs are prefered....If this is correct..What is the difference..and what does a crank hub do..Thanks again

Restored 76 LE Trans Am 455 4 speed..# matching
Restored 68 Camaro R/S 327 4 speed
Restored 55 chevy Belair
Blown, Fuel Injected

[This message has been edited by Badcaiman (edited 10-22-2001).]
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post #2 of 2 (permalink) Old Oct 22nd, 01, 06:18 PM
Senior Tech
Join Date: Jan 2001
Location: skiatook, ok
Posts: 3,692

I dont think crank hubs are recommended for anything other than maybe sprint cars or similar applications. When your engine is running, especially at higher speeds, not only is the crank rotating, it is also moving minutely back and forth in the same circular path...this is harmonics. A harmonic balancer basically smoothes those pulses down to a point where they have little to no affect on the life of the crank...without it (ie...running a crank hub instead), the life of the crank is seriously reduced. The harmonic spikes will eventually cause the crank to break into several pieces. For an outright racing engine that gets rebuilt often, the increases power is worth more than a crank that lives for 100,000 miles. An engine with just a hub will rev very quickly (less rotational mass)...at the expense of crank life. I am sure others can add to this....but the bottom line is that for a street car and most racing applications, run a harmonic balancer.

375hp 78 Chevy truck
77 Chevy Nova
95 Chevy Lumina 3.4L
and building a 78 Nova
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