What would have caused this?

I was playing around on a hill a little bit this weekend when this happend, wasnt on it real hard just heard loud noise and it quite turned around and seen oil and smoke go everywher. It wasnt makeing any noise before it happend it was running good,valves look good to. It for sure messed up the head, case took a lick but i think it will be ok im prety sure botom end is fine but im going to tear it down to be sure.

Can't see the head . But I think the wrist pin lock came out and the pin slide over 1/2 why and broke the piston . Look at the rod good .

The rod looks fine, the top of the head took a beating broke off top of combustion chamber and cooling fins.

Thanks

Cheek the bronze bushing to .

obviously this is just a guess, but i thinking skirt broke off piston or cracked. piston rocked in bore and CA-BLAMO!!

closer i look i think hyde is right. think i see a mark along the cylinder wall from the pin and that rod got mean bend in it!

Could it be the very thin cylinder walls?

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if you use teflon buttons with pistons that take the short wrist pin that will cause it. just happened to my buddies brandnew motor during break in. took us a min to figure out what happened.

They are AA jugs and pistons that might be the whole problem?? They had the spiral lock clips on wrist pin.

were the rods chinese?I just want to know how they hold up if they are.

I dont know for sure they were in the motor when I bought it, but they held up good I dont think it hurt it.

Thats exactly what happened the spiral lock came out and the wrist pin came out to. On the AA pistons the wrist pin will nearly come out of the rod when they are out that far. So I think when the pin was out on the cylinder wall it busted the piston and it took off from there. I would definatly tear the bottom end down and make sure to get it all out. Dude that sucks.

Yeah you got that right it sucks bad! lol But gotta pay to play i guess!! Yeah im gonna tear it on down to check everything out make sure its ok, prolly going to change it up a little bit different cam and for sure heads lol What have yall heard about the mofoco 050s?? Ther are a bunch of people around here running 042s they seem to be great heads jus looking to go a little bit biger.

I would just about bet money that the rod is bent. It may have been bent to start with and that is what caused the spiro lok to get knocked out. As for the heads,you can't beat the CB cnc ported heads for the money.

Yeah it definetly took a beating im going to buy new rods to be safe, if I dont go with the mofoco heads I was wanting to try the CB wedge ports. A friend of mine is runing mini wedges on a 1915 and it will run like a scalded ape so I thought about runing kinda the same set up with my 2275.

Thanks for the info

The mini wedge ports or the new Super Pro heads would be a better choice. Personally I would go with the Super Pro.

X2 super pro or ported S/E

Ill definatly check em out. Thanks for the info!