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Old 03-16-2014, 11:36 PM   #1
toolmakeron
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Default wrist pin clip issues

On a 632 Chev , 14.5 engine, we found some pieces of wrist pin clips in the oil change. They are 2- .042 spirolocks.(per side) They were not excessively stretched when installed.My first thought was a bad batch of heat treated clips. I was told that because he hit the chip in the water box, this will cause this kind of problem. Engine had about 60- 75 hits on it. He (the driver) also pedals it in the top end. car is a dragster, about 2100 lbs . I was told that this also might contribute to this problem. I get my info from drag racers that have 40 years in the game & I respect their knowledge. Any input or experiences that I can learn / understand whats going on ? His last engine pounded out the clip grooves to about .030-.035 end play. Same basic engine.Same car . Thanks guys
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Old 03-17-2014, 11:14 AM   #2
rickseeman
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Default Re: wrist pin clip issues

Quote:
Originally Posted by toolmakeron View Post
On a 632 Chev , 14.5 engine, we found some pieces of wrist pin clips in the oil change. They are 2- .042 spirolocks.(per side) They were not excessively stretched when installed.My first thought was a bad batch of heat treated clips. I was told that because he hit the chip in the water box, this will cause this kind of problem. Engine had about 60- 75 hits on it. He (the driver) also pedals it in the top end. car is a dragster, about 2100 lbs . I was told that this also might contribute to this problem. I get my info from drag racers that have 40 years in the game & I respect their knowledge. Any input or experiences that I can learn / understand whats going on ? His last engine pounded out the clip grooves to about .030-.035 end play. Same basic engine.Same car . Thanks guys
There is something else going on here. Everybody in the country runs double spirolox ( which is way overkill) and doesn't have a problem and he pounds them out of 2 motors in a row? Something is way wrong.
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Old 03-17-2014, 06:11 PM   #3
toolmakeron
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Default Re: wrist pin clip issues

yea I know somethings very wrong, but the" fun" ? here is how to avoid it next time.The driver won't listen to me & thinks it's the engine builders fault...isn't it always? LOL
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Old 03-17-2014, 08:32 PM   #4
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Default Re: wrist pin clip issues

I've seen before when an engine is detonated hard enough it will bow the pins and push hard on the spirolox - overrev will do it also.
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Old 03-19-2014, 07:08 AM   #5
richie 2
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Default Re: wrist pin clip issues

spark plugs would show signs of detonation?
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Old 03-21-2014, 01:02 AM   #6
toolmakeron
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Default Re: wrist pin clip issues

I haven't seen the plugs, but I was told that it's hard to see signs of detonation from alcohol engines. I don't know this, only going from what I was told. The driver / tuner would see this , I think he would know about this. I keep suspecting , on the chip in the water box. Thanks for the input guys.
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