Blew up my SHEE!

[gregrob]

That's not death from old age.

 

That's lean.

 

I did that one time when I leaned out my needles too far. It was popping in the low / mid range and detonating at WOT. Got it too hot and it was all she wrote, still ran but deformed the piston like that, ruined the dome, lost almost all compression etc.

 

Just a jetting fook up IMO.

 

Did you do a plug chop after all the changes? Make sure everything was tight?

[someone82]

First I hope your planning on splitting the case; you mentioned you killed it running through water, your rods and crank could have taken a beating too when trying to compress that water, ie. hydro-lock. You need to make sure that crank is still true and the rods are actually strait (not just with an eyeball check). Trust me on this one, i learned it the hard way years back.

 

 

Second I agree with gregrob, I've seen that before and that is definitely a case of being too lean and overheating the cylinder. Were your plugs backed out or loose?

[stokes77]

That's not death from old age.

 

That's lean.

 

I did that one time when I leaned out my needles too far. It was popping in the low / mid range and detonating at WOT. Got it too hot and it was all she wrote, still ran but deformed the piston like that, ruined the dome, lost almost all compression etc.

 

Just a jetting fook up IMO.

 

Did you do a plug chop after all the changes? Make sure everything was tight?

 

I didn't have a chance to do a plug chop after I changed the needle position... but I don't understand how it could be so lean just by moving my needle clip up a notch. It ran great here, and I was changing 3000 ft higher in elevation.

 

First I hope your planning on splitting the case; you mentioned you killed it running through water, your rods and crank could have taken a beating too when trying to compress that water, ie. hydro-lock. You need to make sure that crank is still true and the rods are actually strait (not just with an eyeball check). Trust me on this one, i learned it the hard way years back.

 

 

Second I agree with gregrob, I've seen that before and that is definitely a case of being too lean and overheating the cylinder. Were your plugs backed out or loose?

 

I was still debating if I was going to split the cases, but I am thinking it's my best bet. The plugs were in 100% tight. From what I could tell in all the intake boots there was no cracks anywhere and the reeds were on tight with gaskets, so I don't think there was any air leaks causing a lean condition. Only thing I didn't check was crank seals.

[AKheathen]

you were lean on the mains. if you fiied up up there, it would be worse. the water tightened things up, and BOOM!