Piston and rod balancing

[tdafforn]

Now all the machining is done its time for me to balance the rods and pistons.
The rods are standard 2373 rods from a 711m block. I have weighed them for total wieght and the Max difference is 4g (with shells and ARP bolts in place). I will weight them end for end tonight.
I am going to try and match them to within 1g (accuracy of my balances). Should I take all the weight from the balance bosses on the big and small ends?
I am proposing to use a hand file (As suggested previously) should I file along the long axis of the rod to minimise the likelyhood of file marks leading to cracks?
Should I polish the filing marks out?

I am also going to check the pistons for balance. If there is a difference where should I remove the wieght from?

Thanks for any help and sorry if the questions are a little simple, this is my first rebuild

[rgh0]

Tim

Unless you are trying to lighten all the rods by removing the bosses just take the minimum of the required rod bosses to get to you 1 gm target.

Always best to file along the big end boss as any stress raising line from filing will be less likely to result in a crack as you observe. After filing I would always polish out the filing marks in any case and leave the boss surface with a near mirror finsh.

Piston balancing if needed best done by taking a small amount out of the internal of the ends of gudgeon pin using a round file where it is unstressed, if no obvious surplus unstressed metal in the piston casting or forging itself ( which is usually the case these days). Take an equal amount out of each end to keep the piston balance symetrical. The forged JE pistons I have been buying for the last few years have always come balanced to within 1 gm and not needed any further work.

cheers
Rohan
cheers
Rohan