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Old 04-23-2010, 09:07 AM
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Crankshaft internal vs external

Just wondering what the difference is between the two crankshafts to make sure i ordered the right one...

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Old 04-23-2010, 09:40 AM
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an external balance crank will have a flexplate/flywheel that has a weight welded onto it and must be balanced with it. an internal balance will not have the weight on the flywheel/flexplate. What engine is this for? also the harmonic balancer might have a chunk of material missing from it if its external balance
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Old 04-23-2010, 09:49 AM
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Its a 350 sb.. I will have to check the flywheel and balancer when i get home, Is it possible to go from an external to an internally balanced crankshaft?
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Old 04-23-2010, 09:51 AM
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Quote:
Originally Posted by titan uranus
Its a 350 sb.. I will have to check the flywheel and balancer when i get home, Is it possible to go from an external to an internally balanced crankshaft?
all sbc 350s from the factory were internal
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Old 04-23-2010, 10:04 AM
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Ok, thats good to know..
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Old 04-23-2010, 10:11 AM
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Originally Posted by titan uranus
Ok, thats good to know..
all gen 1 sbc engines were internal except for the 400.
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Old 04-23-2010, 11:45 AM
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I know that the 454 BBC are externally balanced, too.
What about 502 BBC, are they also externally balanced?
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Old 04-23-2010, 11:55 AM
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Quote:
Originally Posted by titan uranus
Just wondering what the difference is between the two crankshafts to make sure i ordered the right one...
The 350 is considered to be an internally balanced engine which is true for the cranks using the 2 piece rear seal basically pre 1986 production but also many current crate engines, so you have to check. The one piece seal 350 engines carry a small counterbalance at the rear externally because the rounding of the crank end to fit the seal took off a very small counterweight. Again you have to check to see if the intended flywheel or flexplate is equipped, if not there is an aftermarket part that bolts to the crank that brings the balance back.

So you just have to be careful when you start mixing parts.

Bogie
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