engine failure pictures
Registered User
Joined: Mar 2012
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When my motor blew I took my head off I was like "oh cool ! No piston damage ! And then I spun the crank and cylinder 4 had a big chunk missing and every cylinder was trashed and the pistons looked like this
Pretty sure it was a timing issue with the tune. Crank was ok and checked out by engine builder and being used in another build now. Was able to sell the block to someone for sleeving
And now I drive an Evo Lol
Pretty sure it was a timing issue with the tune. Crank was ok and checked out by engine builder and being used in another build now. Was able to sell the block to someone for sleeving
And now I drive an Evo Lol
Joined: Sep 2012
Posts: 3,301
Likes: 213
From: Greenwood, AR
Joined: Oct 2000
Posts: 9,033
Likes: 21
From: South of the pier, Huntington Beach, CA
Something got in there and beat the motor up for sure. I dont think its pieces of ring, with out the top of the piston broken there is no way for chunks of ring to get up that far, if the rings or lands were broken I would expect to see more scaring on the cylinder walls.Any chance you could have sucked up anything through the intake? Throttle body come apart, turbo come apart?
Originally Posted by RAIN H8R' timestamp='1400104152' post='23160224
look at my first image. No sign around the outer diameter of the piston top does it show where the ring got through.
The rings let go. Too much detonation. Happened to mine like that. The ring piece works it's way between the piston and wall into the combustion chamber. It bangs around in there making the marks on the piston & head then exits via the exhaust. You can hear it tinkling back through the exhaust after banging around in the combustion chamber.
Joined: Sep 2012
Posts: 3,301
Likes: 213
From: Greenwood, AR
Originally Posted by wadzii' timestamp='1400071511' post='23159296
Something got in there and beat the motor up for sure. I dont think its pieces of ring, with out the top of the piston broken there is no way for chunks of ring to get up that far, if the rings or lands were broken I would expect to see more scaring on the cylinder walls.Any chance you could have sucked up anything through the intake? Throttle body come apart, turbo come apart?
Originally Posted by RAIN H8R' timestamp='1400104152' post='23160224
look at my first image. No sign around the outer diameter of the piston top does it show where the ring got through.
The rings let go. Too much detonation. Happened to mine like that. The ring piece works it's way between the piston and wall into the combustion chamber. It bangs around in there making the marks on the piston & head then exits via the exhaust. You can hear it tinkling back through the exhaust after banging around in the combustion chamber.
Piston to wall clearances are in the thousandths of an inch. A loose, aftermarket forged Subaru piston is still in the ~.003" range, with the OEM S2000 clearances being MUCH tighter. A broken ring (unless broken into a fine dust), isn't going to make it between the piston and wall without some serious damage to the piston ring land and/or cylinder wall.
