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Tractor Pulling Discussion Forum

BALANCING AN ENGINE

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SMTA PULLER

12-17-2003 10:46:06




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Am building an M Farmall type engine. Rods ground to clear cam small end narrowed.Which is more important?Big end ,small end and piston,complete assy.All of the above?How much can it be off and not shake iyself to peices?Thanks for all input.




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Paul

12-17-2003 21:18:43




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 Re: BALANCING AN ENGINE in reply to SMTA PULLER, 12-17-2003 10:46:06  
Balancing is an art as well as science.There are many factors that go into engine balancing.you can overbalance, underbalance,or neultral balance. hign rpm balance is critical Low rpm high compression welded cranks etc.etc.balance is just as crucial. I was told a long time ago, if you can afford crank work, rods and pistons balance it.if you can't why start.Paul



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G-MAN

12-18-2003 16:23:35




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 Re: Re: BALANCING AN ENGINE in reply to Paul , 12-17-2003 21:18:43  
Yes, isn't it true that although balancing an engine helps the engine run smoother at all RPMs, that it's only truly in "balance" at whatever RPM it was balanced for? If such is the case, you would definitely want it perfectly balanced at the RPM it spends the most time at.



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dan

12-17-2003 17:56:00




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 Re: BALANCING AN ENGINE in reply to SMTA PULLER, 12-17-2003 10:46:06  
on an inline engine as long as you keep all the rods and piston weights equal to each other you will be fine. porshe goes within 4 grams. if your going to take the time to do it go as close as you are able. as far as the cranck assembly. you are as good as stock without doing anything.



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E J

12-17-2003 15:51:20




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 Re: BALANCING AN ENGINE in reply to SMTA PULLER, 12-17-2003 10:46:06  
1 gram = the weight of a one dollar bill F Y I



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farmall

12-17-2003 12:52:32




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 Re: BALANCING AN ENGINE in reply to SMTA PULLER, 12-17-2003 10:46:06  
Balance rods by making them all the same weight (within 5 grams). Pistons should be all within 5 grams of each other. Balance crankshaft with flywheel and front pulley. This works well for me.



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