Crankshaft balancing, bobweight, balance factor

[belongtomes3]

Hi guys, I want to re-balance the crankshaft after bore up.
use bobweight to simulation the weight of piston,ring,small rod,pin
but each site gives me a different formula to calculate bobweight, and it seems these formulas is for car engine with several pistons.
my question is the way to calculate bobweight for 1 cylinder engine and 2,3,4 ...cylinders engine is the same or different.
can you guys show me what formula to calculate bobweight for 1 cylinder engine I:I

"BALANCE FACTORS" is mentioned in some formula, what is it and how do we know what balance factors of the engine. thanks alot

 

[MrTwoJay]

I would suggest having it balanced on a machine. A friend of mine does it from home, if I can recall correctly, you balance the crank on its own, then weigh the rods, then weigh each side (big and small ends), then weigh the pistons. This applies to inline fours and sixes, not sure about singles, but I guess its got to do with the balance shaft...
I heard him talk about bobweights when doing v motors.

 

[sjwh]

Hi guys, I want to re-balance the crankshaft after bore up.

Why do you want to re-balance it? are you trying to compensate for the different weight of the new piston and rings?

In my experience it won't make any noticeable difference but I guess a perfectly balanced engine will last longer.

When I bought my blaster the balance shaft was 90 degrees out of phase with the crank, I didn't notice any difference when I corrected it.

 

[Awk08]

i just curious, if you figure out how to check the balance
how do you plan to remove material, or add the heavy metals, required to balance it ?????