CAN-AM (BRP) Discussions about CAN-AM ATVs.

Wrist pin broke on RWR piston.

Old Jan 26, 2005 | 07:40 PM
  #21  
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Default Wrist pin broke on RWR piston.

Originally posted by: crackerJack
It was installed by the local bomb mechanic. I am not sure what he gapped it to and he doesn't remember exactly.
You would be surprised how many reputable engine builders don't know they have to set the ring end gap on a new set of rings. Not to mention, what the gap should be for different applications such as nitrous or turbo. This has been the destruction of many engines.

If he doesn't remember, then I would suspect he didn't do it. It would seem likely he should be able to do a quick calculation in his head and give you an immediate answer.

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Old Jan 26, 2005 | 10:34 PM
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Default Wrist pin broke on RWR piston.

Justin here is the last pic of your new paper weight justin's piston
 
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Old Jan 27, 2005 | 12:18 AM
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Default Wrist pin broke on RWR piston.

Major, Nice. I guess we are waiting to see how long the hp research piston is going to be. When do you think you will be ready for the piston? How much more do ya think we could take off the top of this piston to bring down the compression?? Could we get it down to 9/1? RWR was worried about thinning the top of the piston out to much more than they did.
 
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Old Jan 27, 2005 | 12:29 AM
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Default Wrist pin broke on RWR piston.

my guess is we could get it down to 9.5:1 due to the valve reliefs - by Monday I'll need to give Millenium the finish honed diameter so we need to move very soon.
 
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Old Jan 27, 2005 | 02:09 AM
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Default Wrist pin broke on RWR piston.

I will call eric tommorrow if I don't hear from him sooner.
 
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Old Jan 27, 2005 | 08:56 AM
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Default Wrist pin broke on RWR piston.

Pami has different thickness of base gaskets if you need.

They are made of aluminum so they are re- usable.
 
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Old Feb 4, 2005 | 05:51 PM
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Default Wrist pin broke on RWR piston.

Bad News. Major cannot get the wrist pin bushing pressed in without taking the rod off. Does anyone have an idea?? Maybee a stock rod and crank in the garage. Is there a way to get the bushing in right without taking the rod off?

justin
 
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Old Feb 4, 2005 | 06:14 PM
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Default Wrist pin broke on RWR piston.

Not really much help but, sent a PM to you anyways with possibilities.
 
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Old Feb 5, 2005 | 01:42 PM
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Default Wrist pin broke on RWR piston.

An important suggestion that nobody has mentioned though you may have thaught of it already. Since the wrist pin broke inside the rod and I'm sure it ran it in this condition, I strongly advise checking the inside of the rod's wrist pin boss for out-of-round after the bushing is out.
When The wrist pin broke it put abnormal lateral loads on the ends and center of the rod boss and may have damaged it. Not necessarily deviation that is visible to the eye but could be substantial enough to cause another wrist pin failure or worse yet, a small end rod failure. The optimistic view will suggest that the bushing absorbed the load and saved the rod from damage. I hope the later is true in this case.
 
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Old Feb 6, 2005 | 10:05 PM
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Default Wrist pin broke on RWR piston.

a local automotive performance machine shop should be able to press in a bushing without taking rod off.
 
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