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Old 07-04-2004, 08:41 PM
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Crankshaft ??

Whats the difference beetween an externally and internally balanced crankshaft and which ones better

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Old 07-04-2004, 08:57 PM
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i can't give you a good answer, but i can tell you to look through these and see if what your looking for is there.....

i do know on an old ford, the externally balanced motors had a hatchet shaped counter weight on the outer snout of the crank, the internally balanced motors don't....
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Old 07-04-2004, 09:36 PM
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i know with SBCs only 400's are externally ballanced. THey have an offset chunk on the flywheel that ballances them-

K
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Old 07-05-2004, 01:58 PM
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Actually, besides the 400 sb, all small blocks after 1986 with the one piece rear oil seal are externally balanced with the exception of the Gen III LS1 which is internally balanced......all externally balanced cranks need matching externally balanced dampeners and flexplates or flywheels........as for which is better.....that's a tough can of worms to open......they both perform well if you have a good game plan, and do your homework.

Jeff P

PS if high RPM was part of my goal.....I'd go with an internally balanced setup so a fluid dampner could be used....just my 2-cents.

Last edited by Pinardi; 07-05-2004 at 02:04 PM.
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Old 07-06-2004, 12:56 AM
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383s can also be externally balanced when the 400 crank is used. 454s were externally balanced big blocks.

The external balance is there because there wasn't enough room for the extra material needed for balancing inside the crankcase, so they added the weight to the balancer.
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