Rod Balancing Procedure

[unariciflocos 49 1 Cars]

Out of 16 rods, I still can't find 4 good ones whose weight matches.

 

Apart from taking material off from the small end and big end cap, would it weaken the rod if i take material off the small ridge that runs up and down the rod on the inlet and exhaust side?

[GilesW 41]

Are they that far out?

Mine have always only needed a bit of the big end caps.

[unariciflocos 49 1 Cars]

Over 10 grams. I've even learnt the difference between them based on the code they have stamped on the big end side.

 

Multiple spun shells means that I now have 2 or 3 of each kind and I need to mix and match 4 good ones.

 

Honestly it would make more sense to me to take material off from that ridge, rather than from the top of the small end, which looks quite feeble compared to the main body of the rod, but then again, my trade is electrical so may be really wrong. The caps are all exactly the same weight.

Edited May 12, 2014 by unariciflocos

[2052NV 24]

When i got mine balanced he shaved small amounts off the top of the cap and above the gudgen pin hole and have been fine for a long time

[unariciflocos 49 1 Cars]

The problem is I need to shave off more, so would need to take some material from the body of the rod itself and don't know if it will weaken it.

[B1ack_Mi16 67]

Just remove material from the forging line along it's length?

[DamirGTI 342]

That's the way they do/prepare stock conrods for race engines - removing casting marks/ridges from the sides of the rods (but only raised marks without cutting deeper into the rods) and polishing afterwards . Removing just the casting marks/ridges wont weaken them .

 

Aside from reduced weight , with the casting marks/ridges removed and surface polished the rods will be much more less likely prone to crack formation , if not completely .

 

 

D

[unariciflocos 49 1 Cars]

That was precisely what I was trying to find out, if I can grind down the casting ridges towards the inlet and exhaust. I would not have considered grinding on the H profile on either side of the rod.

 

Perfect. Thanks!

[shalmaneser 26]

Don't just take a notch out though, do it along the whole length if possible.