The tungsten alloy crankshaft counterweight means that the sum of all the forces is roughly equal to zero at any point in the assembly's rotation, of which the operation is done by the tungsten alloy crankshaft counterweights .The tungsten alloy crankshaft are designed to offset the weight of the rod and pistons. It is critical that the crankshafts must be balanced to customized rod and piston combination.
How to Static Balance a crankshaft?
First have a got a precision electronic digital scale that can weigh up to about 13 lbs, and one that will break at 1/10th of an ounce or 1/2 of a gram, it will be much better if it is more precise. And digital scale works much better than a mechanical one for balancing an crankshaft.
And prepare pencil, notebook and calculator to keep track of the results.Thirdly, weigh the stock piston, rings, pin, clips and connecting rod, making a note of the total weight. Be sure the scale is on a level surface.
Then weigh the heavier piston, rings, pin, clips, connecting rod and bearing insert as a unit. Write that weight down.Subtract the two above weights and note the difference and weigh the crankshaft and record the weight.
Adding the difference in weight to the tungsten alloy crankshaft counterweight. Drill holes lengthways in the counterweights and weld in tungsten alloy, or fill in the factory drilled out holes with some lead capped with steel that's held in place with a roll pin driven in crossways, or weld or bolt some thin plate steel on the side(s) of the counterweights. Being noticed that try to add an equal amount of weight to each counterweight so that the crankshaft won't it be too heavy on either end.Then, weigh the crankshaft again and subtract the difference from the result that was derived in step 4.
The added weight to the crankshaft should now reflect the difference in weight of the two piston/rod assemblies. If it doesn't, it's OK to grind off some weight from the counterweights. The crankshaft and piston/connecting rod assembly are now statically balanced.