What caused this Exhaust Valve damage? pics > >
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What caused this Exhaust Valve damage? pics > >
Just picked this engine up tonight.
This is a Legacy GTB Twin Turbo 280hp EJ208 engine.
Died through lack of compression on cyl 4.
Other 3 cyl's compression was good.
The other head is still attached.
Piston top looks fine, (on the left) no bits missing, not checked the bore yet though.
Exhaust valve appears to have bits missing:
Also, is this a semi-closed deck block?
This is a Legacy GTB Twin Turbo 280hp EJ208 engine.
Died through lack of compression on cyl 4.
Other 3 cyl's compression was good.
The other head is still attached.
Piston top looks fine, (on the left) no bits missing, not checked the bore yet though.
Exhaust valve appears to have bits missing:
Also, is this a semi-closed deck block?
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Fuel? Map? All unknown!
I just bought the car today, and this was in the boot.
I can ask the guy some questions tomorrow.
Would the valves burn, but not melt the pistons?
Could a bad injector do this, if only one cylinder is damaged?
I just bought the car today, and this was in the boot.
I can ask the guy some questions tomorrow.
Would the valves burn, but not melt the pistons?
Could a bad injector do this, if only one cylinder is damaged?
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It's an open deck block, and I'd say you need to completely strip that engine and carefully clean all the parts before you decide about any of it.
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Plugs are fine
I just did a search, and it look like a straightforward open deck.
No gasket, just the imprint where it's been, but pics aren't very good. Yes, it is open deck.
I very much doubt it's ever been remapped, but the car does have a 3" Decat exhaust (the primary turbo cat is still there, Twin turbo's have 2 cat's).
I'd also take a guess it's been run on 95ron, not 99 as it needs, and the Flamer kit suggest to me that it hasn't been sympathetically treated!
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It's No. 2 thats had the problem, left piston as you look at it but right head view, if you look at the bottom of the pistons and the top and bottom of the combustion chamber they are cleaner than the other cylinder could be injector spray pattern?
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I would go along with this. Check the oil control rings on that cylinder . All valves I've seen like this has been because of oil ingestion under cylinder vacuum.
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This would explain the smokey exhaust the guy told me about, the oil had to come from somewhere.
So this could be (in theory), looking at the evidence presented before us, M'Lud:
A dodgy injector, washing the cylinder wall, causing the rings to fail, causing oil burn which destroyed the valves?
How long does it take to burn valves like that, minutes, or months?
So this could be (in theory), looking at the evidence presented before us, M'Lud:
A dodgy injector, washing the cylinder wall, causing the rings to fail, causing oil burn which destroyed the valves?
How long does it take to burn valves like that, minutes, or months?
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