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Old 02-18-2008, 03:52 PM
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balance of a rotating assembly

There is going to be alot of questions from me .
I am getting ready for my first v-8 engine build , I have built several L-6 motors in the past . This one is going to be supercharged so the investment is going to be pretty heavy . I dont want any mistakes , this is going to be a long build . I will start putting up pics once I have something to show .
The superchager is presently at supercharger USA for some work , he can improve the clearances and get some more boost with same pulleys
I have been looking at the Forged rotating assemblys from Scat that come factory balanced , I seen it suggested that it should be balanced agian by a engine shop . If this is necessary then why pay extra for the factory balance ?
I have wondered exactly what they do to balance the rotating assembly? Is this something that can be done with a good scale and a grinder or is it required to use specialized equipment ? I am a scale technician by trade so I can get just about any scale i want for few days to do this .

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Old 02-18-2008, 05:05 PM
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Quote:
Originally Posted by smokin63
There is going to be alot of questions from me .
I am getting ready for my first v-8 engine build , I have built several........... .
I always recommend that a "balanced" rotating assembly be at least checked by a trusted shop. The ones that I have checked range from pretty close to "what the hell were they smoking THAT day?"

Here is a good overview of balancing:

http://www.babcox.com/editorial/ar/eb10330.htm

Plus, I like the graphic because it has the same balancer that I use.

tom
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Old 02-18-2008, 09:01 PM
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Quote:
Originally Posted by smokin63
There is going to be alot of questions from me .
I am getting ready for my first v-8 engine build , I have built several L-6 motors in the past . This one is going to be supercharged so the investment is going to be pretty heavy . I dont want any mistakes , this is going to be a long build . I will start putting up pics once I have something to show .
The superchager is presently at supercharger USA for some work , he can improve the clearances and get some more boost with same pulleys
I have been looking at the Forged rotating assemblys from Scat that come factory balanced , I seen it suggested that it should be balanced agian by a engine shop . If this is necessary then why pay extra for the factory balance ?
I have wondered exactly what they do to balance the rotating assembly? Is this something that can be done with a good scale and a grinder or is it required to use specialized equipment ? I am a scale technician by trade so I can get just about any scale i want for few days to do this .
Factory balance don't mean much as they have no idea what piston, rod, rings ETC. Have your local shop balance it for you, plus you need both ends of the rods clearanced and the pin bores in the pistons honed as well.
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