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-   -   Micro Welding of bearing shell to rod housing bore (https://classracer.com/classforum/showthread.php?t=80106)

Stan Weiss 08-25-2021 11:17 AM
Re: Micro Welding of bearing shell to rod housing bore
 
Quote:
Originally Posted by Stan Weiss (Post 646091)
OK, I have no personal experience with this problem. But have talked with someone who I believe had a similar problem. He modified his rod bearings to give a little more clearance in just that area and that seemed to fix his problem.

Stan

Quote:
Originally Posted by Ralph A Powell (Post 646275)
A good read on honing the big end of steel rods is in the SA Design Jenkins small block Chevy book I’d how he puts .002 shim stock the hens the rods round then removes it. The rod is now out of round but high rpm it stretch’s back round as I remember it’s when the rod does not have enough material at the parting line.

That sound like a better way than modifying the bearings.


Stan

Larry Hill 08-25-2021 11:38 AM
Re: Micro Welding of bearing shell to rod housing bore
 
ATI balancer

SSDiv6 08-25-2021 12:05 PM
Re: Micro Welding of bearing shell to rod housing bore
 
Quote:
Originally Posted by Larry Hill (Post 646287)
ATI balancer
You should have the harmonic balancer refreshed by ATI.
Although it balanced with the rotating assembly, it does not have anything to do with the operation. It has to more to do with harmonics dampening during the engine operation under load.

Glenn Briglio 08-25-2021 12:21 PM
Re: Micro Welding of bearing shell to rod housing bore
 
Quote:
Originally Posted by Ralph A Powell (Post 646275)
A good read on honing the big end of steel rods is in the SA Design Jenkins small block Chevy book I’d how he puts .002 shim stock the hens the rods round then removes it. The rod is now out of round but high rpm it stretch’s back round as I remember it’s when the rod does not have enough material at the parting line.
This is when there weren't any good connecting rods available. Today's rods stay round even at higher rpm. That's if it's a good quality rod. Crower, Callies, etc

Ralph A Powell 08-25-2021 02:01 PM
Re: Micro Welding of bearing shell to rod housing bore
 
If read the article he was talking about Carillo (not sure of spelling) rods they are shown in the book. At that time there were good Steel aftermarket rods available.

Quote:
Originally Posted by Glenn Briglio (Post 646291)
This is when there weren't any good connecting rods available. Today's rods stay round even at higher rpm. That's if it's a good quality rod. Crower, Callies, etc

Larry Hill 08-31-2021 07:30 AM
Re: Micro Welding of bearing shell to rod housing bore
 
I got to speak with Glenn Briglio in person yesterday, what a wealth of knowledge, and he advised changing out the ARP rod bolts to a higher quality bolt next time. And then the sprinkles fell.

Larry Hill 10-07-2021 02:13 PM
Re: Micro Welding of bearing shell to rod housing bore
 
Dan Beagle from Mahle spoke on the subject and said low radial pressure on the bearing shell could be a possible answer. This was on the AERA webinar.

Larry Hill 10-09-2021 07:50 AM
Re: Micro Welding of bearing shell to rod housing bore
 
Mr Beagle advised to check with the rod manufacturer on correct ID finish in housing bore. It maybe to smooth and allowing the shells to move.

Ralph A Powell 10-09-2021 08:48 AM
Re: Micro Welding of bearing shell to rod housing bore
 
Maybe you need a oil with more EPI activities To keep the oil from being squeezed out!


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