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Old Nov 11, 2014 | 09:56 AM
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If a set of pistons were changed out and the new ones were the same material and mfg and were 8 grams lighter would the crank have to be rebalanced?

Chris
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Old Nov 11, 2014 | 10:37 AM
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IIRC, only way to really do it right is to balance the entire assembly..assembled.

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Old Nov 11, 2014 | 10:42 AM
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Figured as much but didn't know if there were any allowable +/-

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Old Nov 11, 2014 | 11:28 AM
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Originally Posted by cwalsh
If a set of pistons were changed out and the new ones were the same material and mfg and were 8 grams lighter would the crank have to be rebalanced?

Chris
It should be fine, but my local machine shop only charges $125 if all they have to do is drill some superficial holes. They charge more if they have to measure and calculate the bobweight and/or add heavy metal. For that price, I'd rebalance but some engine builders like a little overbalance for applications that are going to turn some considerable RPM. I'd say you could get away with 8 grams.
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Old Nov 11, 2014 | 12:12 PM
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Since mine should just have to be drilled I'm assuming I'll spend the money and have it done. If I'm that deep what's a few more dollars.
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Old Nov 12, 2014 | 01:21 AM
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IMO sleep at night is worth that..but much of the rest of the crowd on here is more experienced than I am. $125 or so seems like good money for piece of mind.
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Old Nov 12, 2014 | 09:30 AM
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I am going to have it spun up and go from there.
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