Cracked piston on high mileage stock bottom end

[bison]

Ran 10.29@133.4mph at 28.5 psi. Was running it at 32-33psi for about 3 months before this happened. Head Gaskets are .040 RJC steel and there is absolutely no sign of the heads ever lifting. Cracked parallel to the wrist pin.

 

[turbo nasty]

How many miles on it outta curiosity

 

[bison]

How many miles on it outta curiosity

149-150k. It was stock till about 143k. I beat the balls off it for the last 2 years and only paid $550 for it. It was over 600hp the whole time i had it. I can only speculate on what caused it. I had a power plate on it and heard from others it may be lean on #1 with the plate installed using alky. I ran at least 110 octane and methanol the whole time.

 

[jasjamz]

Sucks, but isn't your new motor almost done?

 

[X Ray]

149-150k. It was stock till about 143k. I beat the balls off it for the last 2 years and only paid $550 for it. It was over 600hp the whole time i had it. I can only speculate on what caused it. I had a power plate on it and heard from others it may be lean on #1 with the plate installed using alky. I ran at least 110 octane and methanol the whole time.

You got your moneys worth out of that one....:biggrin:

 

[ttaowner]

just weld up the piston and turn the boost back up. lol

 

[bison]

Sucks, but isn't your new motor almost done?

Yeah. I was working on that a little tonight also. Stage 2 very shortly:biggrin:

 

[bison]

just weld up the piston and turn the boost back up. lol

Lol. I want to have the block magged to see if its cracked in the mains. Ill pull the pan off and check the condition of the bearings soon.

 

[ttaowner]

Lol. I want to have the block magged to see if its cracked in the mains. Ill pull the pan off and check the condition of the bearings soon.

if the mains are cracked weld them up too!

 

[tta1240]

149-150k. It was stock till about 143k. I beat the balls off it for the last 2 years and only paid $550 for it. It was over 600hp the whole time i had it. I can only speculate on what caused it. I had a power plate on it and heard from others it may be lean on #1 with the plate installed using alky. I ran at least 110 octane and methanol the whole time.

wow that goes to show the stock stuff will hold up real well with a good tune
lol

 

[SS_Sean]

I'm impressed ol' bessy held up that long!! That's really incredible considering the 143k miles that were on the motor.

 

[Ed Valvo]

Seen cracked pistons from high RPM's. How high were you spinning it? Interested as I'm a stock bottom end guy myself.

 

[bison]

Seen cracked pistons from high RPM's. How high were you spinning it? Interested as I'm a stock bottom end guy myself.

5900 regularly. It hit 6400 a few times

 

[ttypewe4jim]

5900 regularly. It hit 6400 a few times

I wonder if it was cuased by excessive cly. pressure from running 30+ PSI and knowing you most likely alot of timing also

 

[Ed Valvo]

I'd love to see the underside of the piston to see what it looks like and see where the crack starts. Last one I saw had stress cracks where the wrist pin goes in the piston from what appeared to be over revving a stock unbalanced engine with heavy pistons. You my friend made our crack look mighty wimpy by comparison.

 

[spoolie]

post up more pics when you tear it down...

 

[vacuum 6]

...heard from others it may be lean on #1 with the plate installed using alky.

What do you mean?

 

[BEATAV8]

Considering the duty cycle that little bugger ran.. I would consider it a "soft" failure.

 

[jasjamz]

How did this happen, on the street, track? Did it go into detonation for some reason?

 

[ttaowner]

post up more pics when you tear it down...

YEAH WHAT THE F_CK YOU WAITING FOR?????????????????????????????