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-   -   ARP ? Rod bolts (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1087127-arp-rod-bolts.html)

Jeff Alton 03-09-2021 07:14 PM

Quote:

Originally Posted by KNIGHTRACE (Post 11254041)
Jeff one of the biggest causes of failure are guys upgrading to an ARP bolt without correcting the big end. They get there rods done then change bolts, cars usually live 70 to 100 miles. I have seen it about 10 times. other issue is cam sprockets.. I hope we can all help keep people from having issues..

I agree William. There is no "low cost" rebuild that will stand the test of time. Regardless of the quality of some of the product choices.

Cheers

KNIGHTRACE 03-09-2021 08:34 PM

Sorry, The chain/cam sprockets do not go face the same 123 faces inwards, 456 faces outwards. If you make them the same the chain chews metal off the sprocket. The reason is the cylinders are offset, this was done to help align the chains straight.

Lyndon302 03-09-2021 08:39 PM

Ok. I think that is pretty obvious.
The big ends??
I take it with the ARP tension the big ends are resized at this torque as it may or make them out of round ?
Lyndon

KNIGHTRACE 03-10-2021 07:34 AM

Yes, for example if you true the rods at 20 LB and change bolts to 40 LB. it is not the same any longer. On the sprockets you may say it is pretty obvious but when Motor Mi---- was in business I dont think they ever got it correct once.

Glenfield 03-10-2021 10:36 AM

Ive got real reservations that my ARP bolts would have been installed properly. I’ve got 4000 miles into the car today. In folks collective experience, would the failure have already happened? Sounds like it based on Williams experience

Glenfield 03-10-2021 10:42 AM

Perverse as it sounds, think we’re all learning a lot from the debates playing out between Winders and Henry. It’s teasing out some very reputable perspectives on all sides. Occasionally there are some curse words. Every now and again, there’s good humor. Play on I reckon and thanks for taking the time to hash it out.

Before anyone jumps down my throat, I have great respect for winders and his research, field testing and patronage. Without him and folks like him, there wouldn’t be a need to push the envelope. Same for Henry who needs no re-introduction.

Walt Fricke 03-10-2021 06:16 PM

Henry - when you refer to 1250-1500 HP motors, are you referring to drag motors? Do those guys reuse ARP (or other bolts torqued with a stretch gauge) until the gauge says they have stretched more than the few thousandths specified as OK?

Up until now I haven't seen any engine builder or mechanic say that rod bolts which haven't stretched shouldn't be reused.

Nobody mentions the nuts that I recall, though. Porsche just says replace their bolts and nuts.

KNIGHTRACE 03-10-2021 06:52 PM

Glenfield if it made it 4000 miles.. your most likely good I would say 95%

Glenfield 03-10-2021 06:53 PM

Thanks William. Much appreciated

Jeff Alton 03-10-2021 07:02 PM

^^^, over stretched (over rev) or improper installation means imminent failure. We have seen engine last between -60-90 secs where a bolt was over stretched (similar to not stretched or torqued correctly on install). My own GTI lasted 52 seconds on track before I had 2 large holes in the block and parts of pistons and wrist pins sitting on the under tray. Many thanks to the provider of the TCU tune in the DSG gearbox.... :)

Glenfield 03-10-2021 07:35 PM

Thanks William. Much appreciated

KNIGHTRACE 03-11-2021 06:32 AM

Glad to help, have had many calls through the years where the car ran great about 60 miles. Last one was guy named Buzz. Pretty orange 73' with 3.0. Not sure where it was built.. WK

Mr Beau 03-15-2021 09:03 PM

Quote:

Originally Posted by Henry Schmidt (Post 11253400)
Interesting choice: When engineers and engine builders get together to discuss rod designs the conversation centers around strength vs weight, materials and grain structures. They explore the benefits of H beam vs I beam vs A beam. They never seem to include the X beam design. Why is that?

Pauter seems to have pretty good marketing because I still don't get their design approach that is the opposite of every other high-performance connecting rod out there.

https://www.f1technical.net/forum/viewtopic.php?t=27372

Walt Fricke 03-16-2021 01:00 PM

I've heard that often. Long standing customers in the VW drag and off road world, among other things, making for brand loyalty? I can't say I have seen reports of their rods failing, at least more than other rods. Mine haven't, but that's hardly definitive. Cost was a factor for me.

BURN-BROS 03-16-2021 04:23 PM

Quote:

Originally Posted by Mr Beau (Post 11261201)
Pauter seems to have pretty good marketing because I still don't get their design approach that is the opposite of every other high-performance connecting rod out there.




It was state of the art for.:::/
http://forums.pelicanparts.com/uploa...1615940368.jpg


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