Rotating assembly Balance

[willyp42]

Hey Everyone.
i got a new set of wiseco pistons and eagle rods with rings cuts eveything good to go.
i weighed most of my components (minus wrist pin clips and rod bearings)
what do you think, would you run this?
i am kind of worried about the 1 gram difference between pistons.
thanks,
-Will

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[Canadian_CD9A]

I was once told by a powertrain engineer to combine the heaviest piston with the lightest rod (etc...). If the assemblies are within a gram of each other, consider it balanced.

 

[donniekak]

You have to weigh the ends of the rods and match end weights. We spin assemblies matched to within +- 1g to almost 11,000 rpms.

 

[willyp42]

okay thanks, im looking to spin to only around 8500, trying to max out a PTE 6262.
-Will

 

[willyp42]

I was once told by a powertrain engineer to combine the heaviest piston with the lightest rod (etc...). If the assemblies are within a gram of each other, consider it balanced.

As a Powertrain Engineer myself (Calibration) there really are good ones and bad ones, always hyperbole . unless you really know them always take them with a grain of salt.
-Will

 

[jdub099]

After being absent awhile it's weird to me that there's so many questions about the necessity of balancing in the DSM world. I also have a 1965 Mustang- on our Small Block Fords we balance every rotating assembly, every engine build. It's not even a question. Doesn't matter if the crank is internally or externally balanced. It's just a $150-350 cost that you factor into your machine work.