destroyed piston!!
 

I had a loud knock in my engine.

The injectors where tested and where good.

Tonight we took the cilinderhead off. And we found out that the piston in cilinder 3 is broken.

http://i90.photobucket.com/albums/k2...8/DSCN0954.jpg

http://i90.photobucket.com/albums/k2...8/DSCN0956.jpg

http://i90.photobucket.com/albums/k2...8/DSCN0957.jpg




How can this happen?
Could it be that this is because of the Banks Six-Gun?


The word FRONT on the pistons are on all 6 not in the midle.

This is cilinder 6 that one had a few little marks. So proberbly with this piston would happen the same later as on piston 3!

http://i90.photobucket.com/albums/k2...8/DSCN0958.jpg



I hope you can help me!

Roel

#3 to me looks like it was getting too much fuel there is a lot of carbon on that one compared to #6. It also looks like a valve may have touched the top of the piston on the right side. I would re-evaluate the injector in #3 as well as check the valves in that cylinder. Good luck, and keep us posted.

If there was to much fuel it should have make white smoke shouldn't it???
There was no white smoke. I've heard that there could be less fuel. that man told me, it could get to hot then also. Is that right???

And one man told me it also could be a problem with the spraying of the oil to cool the cilinder. Is that also an option?


And if there is a problem with to much or to many fuel could that be thanks to the Six Gun??

Looks like you might have dropped a valve seat, causing the valve to hang open so as he piston could hit it. The extra carbon is probably because the cylinder has been misfiring because of the valve problems, and lower compression. Pull the valves out of the head on that cylinder, and check those pressed in seats. I was kind of disappointed to find they used pressed in valve seats.

The valves would be a good thing to check like sprinter said.

I'm not sure if the banks set up raises rail pressure or not, but if it does it could have caused the injector to crack and dump more fuel to that cylinder. Too much fuel when the engine is cold would make white smoke, when warm it would make black smoke.

There was no white smoke and there was no black smoke. (not more then normal)

There some pics of the head. It doesn't have any marks that the piston hit the head or the valve's. For as far as I can see.(i'm not an expert)

http://i90.photobucket.com/albums/k2...8/DSCN0964.jpg

http://i90.photobucket.com/albums/k2...8/DSCN0967.jpg


An some pics with the piston in high posision.

http://i90.photobucket.com/albums/k2...8/DSCN0968.jpg

http://i90.photobucket.com/albums/k2...8/DSCN0969.jpg

It looks like there may have been some contact with a valve. I know the valve doesnt look like it, however that 1/2 ring mark on the piston sure looks like it. When a piston cooling jet fails it usually scores the cyl wall pretty good if not caught in time, so check for scoring. If you overspeed the engine with stock valve springs you can do damage like this.


Good luck,

Tim

Like he said, running to high a rpm.

Looks like the valve seat on the cylinder in question is shot. You don't see the missing chunk?

Yep, look at the valve in the 3 o'clock position in the photo, on the lower right hand side it sure looks like part of the seat is gone.

What's the seat??


I think I've touched the 150 km/h maybe the 160/165km/h during overtaking another car.

So that would be somewhere at 2800/2900 rpm. could that be to high?

I agree, looks like a chunk missing starting at roughly 3 o'clock and ending at about 5 o'clock position.

just went thru this w/ mine... high engine temp(seen too late) stuck a valve, beat up the piston.

Yep the valve IMHO... Valve at the 3:00 position in the first valve photo.... Look close at the 4:00-5:00 position of that valve.. note the metal where the valve is supposed to seal up against is missing (the seat) The lowered compression would result in the mess in the cylinder and top of the piston. Cause... Valve Guide sticking weak spring...

I would look there first.

Also check wrist pin for play.

Sorry to hear about your misfortune. Having the Six Gun will not help you warrantee claim.

Can someone mark the position you mean on the pics?
Becuase I don't understand/see what you mean.