piston damage question

[MadBill]

If that's all you have to contribute to a post with a number of people of varying perspective and levels of experience offering their best judgement and honest opinions then I don't care how experienced you are kosky; good riddance!

[kosky racing]

Mad BILL you showed your knowledge --You are the expert, picking shit with the chickens is not my expertise bye bye

[MadBill]

What, you still here?

[needforspeed66gt]

This picture tells the entire story. This happens to be a simple one to diagnose. Look at the gauling (aluminum siezed to the wrist pin). This is what stuck the connecting rod and caused the rod to shatter. If I didn't know about this off the wall wrist pin experiment, I would venture to say that someone set the pin to pin housing bore way to tight on the piston. Tight as in .0004-.0008.

Look at that rod bearing. It's like new. That is not what a rod bearing looks like from lack of oil. Look at those rings. They are like brand new. I can't image this engine made it to half track on the first time out, based upon how some of these parts look.

Yep.

Quite obvious what happened there, was going to say way too tight on the pin clearance and it grabbed, then see it's some retarded aluminum pin with a steel sleeve over it...lol somebody doesn't understand the basic properties of these metals.

[Belgian1979]

OK guys, don't get personal. No reason for that. Everybody's opinion is appreciated.

We all agree on one thing : the pin is BS and bent. It's was already stated that this is a case of risk acceptance by the team by experimenting with it. The judge will finally decide over the outcome.

I still want to know what caused the scratches in the top land ? Rock ? Dirt ?

[twl]

OK guys, don't get personal. No reason for that. Everybody's opinion is appreciated.

We all agree on one thing : the pin is BS and bent. It's was already stated that this is a case of risk acceptance by the team by experimenting with it. The judge will finally decide over the outcome.

I still want to know what caused the scratches in the top land ? Rock ? Dirt ?

I say it's typically rock that caused the scratches, but the same thing could happen if the piston was restricted in its movement by having a bent pin.

[Strange Magic]

It doesn't matter what caused the scratch above the top ring land. The engine is junk and something simple as debree could have caused it. When an engine breaks it is not uncommon to find debree in cylinders that had no issues. The focus and attention needs to put on the root cause of the issue and nothing else.

[Dave Koehler]

BTW, can I have the junk block, heads and whatever is left?

[Belgian1979]

BTW, can I have the junk block, heads and whatever is left?

If the insurer has to pay for it, I can demand the remains are sent to them. I don't think shipment to the us is worth it.

[Belgian1979]

It doesn't matter what caused the scratch above the top ring land. The engine is junk and something simple as debree could have caused it. When an engine breaks it is not uncommon to find debree in cylinders that had no issues. The focus and attention needs to put on the root cause of the issue and nothing else.

Debree getting past the rings ? Past the blower ?

[Dave Koehler]

not the problem

[avengerengines]

Aluminum pin? and a blower?

[BrazilianZ28Camaro]

I still want to know what caused the scratches in the top land ? Rock ? Dirt ?

The rod galled in the pin, the pin grabbed the piston, the crank was turning and rocking the piston in the same direction of its rotation.

[BrazilianZ28Camaro]

If that's all you have to contribute to a post with a number of people of varying perspective and levels of experience offering their best judgement and honest opinions then I don't care how experienced you are kosky; good riddance!

X1000.

I'm far from being an expert, but I do my best to help people solve their problems over here and when they do, I'm happy.

[jsgarage]

Thanks to everyone that posted- especially the OP. I was considering something similar for a lightweight rear suspension pivot bushing originally made of thick-wall hardened high-carbon steel. It ain't gonna happen now.