Help.. flipped piston

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Jan 28, 2014 | 05:06 PM

#31

vegascouple

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From: vegas

the rings on 2nd cyl appear to be ok, however the piston itself is out of round at the botton of the skirt

Jan 28, 2014 | 05:09 PM

#32

Pondskipper

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From: Scotland

Quote:

Originally Posted by soft 02

I did the same thing as the OP when I built my first 2 stroke Detroit 4-53. When the governor came apart I watched chunks of piston fly out of the straight pipe. Not fun.

I had a 2-stroke Suzuki a few too many years ago that snapped a con rod which subsequently came through the sump, it stopped quick.

Jan 28, 2014 | 05:11 PM

#33

Pondskipper

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From: Scotland

I was wondering if it suffered oil starvation on the cylinder, caught the ring and flipped the piston.

Jan 28, 2014 | 05:12 PM

#34

Highlux

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From: Ofallon, MO.

I think the pistons were "bored" and decided to go somewhere else....yuk yuk yuk.

Jan 28, 2014 | 05:13 PM

#35

propflux01

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From: Arkansastan

Is it just me, or does that exhaust valve look like it got hot in its center, kinda matching that spot on the piston? Maybe detonation got so bad that it just hammered that one spot until it forced the piston sideways.

Jan 28, 2014 | 05:18 PM

#36

vegascouple

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From: vegas

propflux
that is exactly what I see also the valve appears to have been red hot

Jan 28, 2014 | 05:20 PM

#37

Tom84FXST

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From: Farmington ,MS

Quote:

Originally Posted by jeffreydsilver

"Flipping" a piston is physically impossible

Obviously you didn't look at the pic...lol. Stroker pistons don't have much skirt area, so they can flip before breaking when they get that hot. Detonation usually burns a hole/melts the top of the piston. The piston had to be "cherry red" when that happened...it was lean for some reason...or the ignition crapped out and went full advance.

Last edited by Tom84FXST; Jan 28, 2014 at 05:23 PM.

Jan 28, 2014 | 05:21 PM

#38

vegascouple

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From: vegas

inside view of exhaust port

view of exhaust

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Jan 28, 2014 | 05:24 PM

#39

vegascouple

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From: vegas

the exhaust side of both pistons are scorched and burnt

Jan 28, 2014 | 05:36 PM

#40

SinisterX

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From: Mid Michigan

That much carbon build up on the heads with 1200 miles tells me he lugged the **** out of it and had detonation occurring as seen in the piston pic's.

This is why people say run the **** out of your performance engines, they're made for it. Lugging them does more damage than beating on them.

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