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-   -   ARP rod bolts ground when balancing (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1091549-arp-rod-bolts-ground-when-balancing.html)

Lyndon302 04-21-2021 01:18 AM
ARP rod bolts ground when balancing
 
My new rod bolts where ground when they balanced the engine. ??
Lyndonhttp://forums.pelicanparts.com/uploa...1618996722.jpg

reclino 04-21-2021 05:09 PM
I hope you didn't plan on using a stretch gauge. If it were me, I would be chosing another machine shop in the future.

Lyndon302 04-21-2021 05:17 PM
I had to read them the riot act. They have now decided to replace them and grind of the appropriate amount that was taken from the bolts.
Lyndon

reclino 04-21-2021 05:36 PM
Well that's a good response.

'78 SC 04-22-2021 06:27 AM
What about removing material from the rod cap rib? Is that correct practice?

Lyndon302 04-22-2021 02:53 PM
Not when the bolts are in the way .

'78 SC 04-23-2021 03:55 AM
Quote:
Originally Posted by Lyndon302 (Post 11306505)
Not when the bolts are in the way .
My point was that the rib on the rod cap is there for strength and should not be ground away for balancing. The shop needs to replace the rods, too.

HaroldMHedge 04-23-2021 07:39 AM
I agree with '78 SC.

Quote:
Originally Posted by Henry Schmidt (Post 11119852)
Removing material from the rod cap ridge on a 911 rod is never a good idea. The "ridge" is structural and designed to provide rigidity. Some people grind this boss (ridge) to balance the rod but even this small amount compromises the rigidity and may allow excessive cap flex at higher rpm.
Taken from Lighter standard rods - how much is too much?, Post #15.

HaroldMHedge 04-23-2021 07:49 AM
Additional information Rod balancing - where to remove material

Quote:
Originally Posted by Henry Schmidt (Post 6841300)
You should remove material from the square edges near the bolts.

http://forums.pelicanparts.com/uploa...1341529337.jpg


I would also remove material from the small end of the rod not the wrist pin.
Removing material from the pin works well for balancing the pistons but if in the future you replace the piston, you will have to remember that the new wrist pin must be balance to the rod. If the next mechanic doesn't know you could drive him crazy.

http://forums.pelicanparts.com/uploa...1341529323.jpg


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