Internal balance vs External balance
#3
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I agree that internal balancing is the way to go. I am not an engine builder, but it makes sense that you want to have any weight/forces balanced as locally as possible. A neutral balanced rotating assembly, with matched weight pistons and rods seems better than using a weighted flywheel or balancer on the end of the crankshaft. Depending on cost, either should work if done properly.
Last edited by burnrubber; 07-22-2010 at 10:27 PM.
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Yes, external balancing refers to weighting or drilling the flywheel (or in your case flex plate - for an automatic transmission) and/or harmonic balancer, while internal balancing is done by weighting or drilling the counterweights of the crankshaft. Either one, or a combination of the two can be used to balance a rotating assembly.
Do you know if this engine runs? If it has already been balanced correctly then I would keep everything as it is, otherwise take the engine to a reliable builder or machinist and have them check the balance.
Do you know if this engine runs? If it has already been balanced correctly then I would keep everything as it is, otherwise take the engine to a reliable builder or machinist and have them check the balance.
#10
the engine was running before in a caprice and then I put it in my camaro but I faced a problem with backfiring due to bended valve's then changed the heads to brodix track 1's and didnt face any problem untill the valve's gave up on me the heads were old and I didnt bother my self with checking anything with them
#13
External balancers are usually not round two thirds of the balancer usually has a larger diameter. Its kinda hard to explain go on ebay or something and look at a pic of one and you will see what i mean. If someone messed around and put these internal balanced parts on a external balanced crank trust me you would know about it cause it would vibrate. And you would have most likely beat the bearing clearances out of it for sure. Hope this helps.
#14
there is no weight in the inside also Im so confused I dont care if its 383 or not I just want to run the engine again in my other car and I had bad time with the starter and large flywheel
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Look at the flex plate you have, both sides, as well as the harmonic balancer. If they appear totally symmetrical, the same all the way around, then they should be "neutral." If this is the case, then you should be able to use any "neutral balanced" flex plate or harmonic balancer that fits.
If there is weight added to one side, or more holes drilled in one side, in other words if they are "lopsided" and would not balance from the center on the tip of your finger, then they are being used to balance the engine and you need to keep them installed in the same orientation (direction) on the engine in order for the engine to run smoothly.
Here's an article that discusses engine balancing with some helpful pictures (this is the second page):
http://www.carcraft.com/howto/ccrp_0...l_balance.html
If there is weight added to one side, or more holes drilled in one side, in other words if they are "lopsided" and would not balance from the center on the tip of your finger, then they are being used to balance the engine and you need to keep them installed in the same orientation (direction) on the engine in order for the engine to run smoothly.
Here's an article that discusses engine balancing with some helpful pictures (this is the second page):
http://www.carcraft.com/howto/ccrp_0...l_balance.html
#16
You really dont have much of a choice in flexplate size you either run a Th153 tooth flexplate or a 168. They both take nearly the same size starter. Usually on after market starters the mount head is usually just turned 180*