It's a Fact!
28 grams of unbalance
at 4" from center of rotating part
at 4,000 RPM causes a force of 112 lbs.
Perpetual Balance, LLC offers complete precision balancing of your rotating assemblies. We balance your crankshaft as a complete assembly with the harmonic damper and flywheel/flexplate installed on the crankshaft during the balancing operation; this is the most accurate method of precision balancing your engine. We can supply your harmonic balancer and flywheel/flexplate, or use your existing good condition harmonic damper and flywheel/flexplate. Precision balancing should also include correcting the weights of the pistons, as well as both the rotating and reciprocating ends of the rods to measure within 2 grams. Using the corrected weights, the bobweight is then calculated specifically for your unique rotating assembly.
Street or Average
Street or Average balancing does not include correcting the weights of the pistons and rods. Only the crankshaft is balanced. Internally balanced engines are frequently balanced without the harmonic damper or flywheel/flexplate installed on the crankshaft during the balancing operation. Externally balanced engines may use a harmonic damper and flywheel/flexplate from the engine family, not necessarily the assembly that is going to be used on your engine. All parts including harmonic dampers and flywheels/flexplates have tolerances. The only way to precision balance your engine is to use the parts that will be assembled with the engine while balancing.