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-   -   Rigid_EVO Wrist Pin Retainer Comparison (http://xlforum.net/forums/showthread.php?t=2072663)

Hippysmack 10th March 2019 03:49

Wrist Pin Retainer Comparison
 
Funny, I was told by NRHS Dan when I bought my 1250 kit that the wrist pin retainer rings were the same as OEM.
That is not true.
I ordered a bag of 22589-83B retainer rings and they are larger in dia. than what came with the CP pistons.

http://sportsterpedia.com/lib/exe/fe...hippysmack.jpg

22589-83B: .059"
http://sportsterpedia.com/lib/exe/fe...hippysmack.jpg

CP retainer ring: .048"
http://sportsterpedia.com/lib/exe/fe...hippysmack.jpg

Can I get these at Hammerperf?
Is there somewhere else to get them in the right size?

rocketmangb 10th March 2019 06:54

Call CP !
I have some if you in a jam !

rocketmangb 10th March 2019 10:06

I know the sound !

"SPROING"---------------TING TING TING !

Bored now 10th March 2019 12:11

Search for 787-050SWL, there are many available on Ebay at the moment. No idea why you were told they are the same as stock, clearly they are not.

decman 10th March 2019 18:17

Maybe just same "C" design. CP now has a different type.

I would think you need to use the one made for the pistons you use.
You are assuming that the wrist pin retainer groove is the same.
I wouldn't assume that without talking to CP.

Hippysmack 10th March 2019 18:37

Thanks rocket,
I'm thinking I may need to call NRHS.
I'm curious now of how to order them.
And I've got some time to wait.
I just had planned too far ahead I guess.
I pulled the top end down to clean and inspect the cylinders.
The little inspection cam makes a good cylinder look ugly.
I cleaned the cylinders, pistons, rings and was all set to reinstall when I noticed the bigger cir-clips.

Quote:

Originally Posted by Bored now (Post 5734151)
Search for 787-050SWL, there are many available on Ebay at the moment. No idea why you were told they are the same as stock, clearly they are not.


Not downing them, I have a Southern drawl and maybe he didn't understand the question.
But I specifically asked since I figured OEM would not work for replacements.
Thanks for the part number.

Hippysmack 10th March 2019 19:00

Quote:

Originally Posted by decman (Post 5734185)
Maybe just same "C" design. CP now has a different type.

I would think you need to use the one made for the pistons you use.
You are assuming that the wrist pin retainer groove is the same.
I would assume that without talking to CP.


I've been researching CP/Carrillo's website.
I have done some research on the 787-050SWL.

CP/Carrillo example nomenclature for wrist pins,
X-990-2750-18CP3C translates to:
X = coating
990 = wrist pin dia.
2750 = length
18 = wall thickness
CP = brand
3 = material
C = type

CP/Carrillo example nomenclature for wrist pin locks,
787-050SWL translates to
787 = Wrist pin dia.
050 = Retainer thickness
SWL = Steel Wire Lock
(additional - the wire lock OD is.910")

The wrist pin dia. (787) was throwing me since the CP pins are .901" OD
I set my caliper to .787" to realize that measurement falls along the chamfered end.
These are 'floating' pins that require a chamfer to work with the wire locks.
Upon side loading, the chamfer on the pin runs up into the wire lock.
This spreads the ID of the lock outward in circumference (pushing the lock against the groove in the piston).
So the pin OD (for determining wire lock size) is that point along the chamfer that will tighten up on the cir-clip and push against it's ID I suppose.
The wrist pins actual OD is .901"
According to Summit Racing, the cir-clips OD is .910" which is what I just verified also.
https://www.summitracing.com/parts/cpd-787-050swl

Heh, would you believe you could buy them at Walmart?
https://www.walmart.com/ip/CP-Carril...lips/419730873

bustert 10th March 2019 20:08

big ? is if it matches the piston groove, if so, size is not relevant.

rocketmangb 10th March 2019 20:52

What ?
Sportster pins are normally .792
S&S had some .901 pins I think !

Hippysmack 10th March 2019 21:58

Quote:

Originally Posted by bustert (Post 5734212)
big ? is if it matches the piston groove, if so, size is not relevant.

I was gonna ask if the OEM cir-clips would work anyway.
I had planned to try and measure the gap.
Shouldn't the clip need to go up into the groove at least by half of the dia.?

Quote:

Originally Posted by rocketmangb (Post 5734222)
What ?
Sportster pins are normally .792
S&S had some .901 pins I think !

I have no idea where .901" came from......
I confused myself with the errant dim but it did make me learn something.
Just stumbling in. I'm starting to wonder if it's flashbacks .. :doh
I'm not sure what went first, the eyes or the memory.

Here is a pic to clear them both up though.
I got .791" but it is used.
The .787" clip makes a Hell of a lot more sense now anyway.


http://sportsterpedia.com/lib/exe/fe...hippysmack.jpg


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