Exhaust valve weight reduction

"Aero" (Aero) 05/21/2015 at 13:25 • Filed to: None

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It doesn’t work very well, let me tell you.

While I’m happy it was “just” a broken valve, the replacement part alone is $103. I guess that’s not too bad considering the valve is made of Nimonic alloy.

You can tell a Finn but you can't tell him much > Aero 05/21/2015 at 13:47

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Hope it didn’t eff up the piston or cylinder walls. What car?

Aero > You can tell a Finn but you can't tell him much 05/21/2015 at 13:55

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It might have damaged the turbo, but no damage elsewhere. It’s off an ‘02 Saab 9-5 Aero.

You can tell a Finn but you can't tell him much > Aero 05/21/2015 at 14:08

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I take it the piece hasn’t been recovered? It seems like it would be death to a turbo. I can’t imagine it taking much to screw up the dynamic balance on something that spins up to 100,000 rpms.

Aero > You can tell a Finn but you can't tell him much 05/21/2015 at 14:12

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That’s my concern. The little chunk made it out of the cylinder and the next stop would be the turbo. I’m not too concerned about rebuilding the turbo, the TD04 is pretty cheap to fix and easy to find parts for. Plus, I have an extra sitting on the shop floor right now.

You can tell a Finn but you can't tell him much > Aero 05/21/2015 at 14:19

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Is there a cat before the turbo? My 2007 STI has a catted uppipe, so that may offer some protection to the turbo.

Aero > You can tell a Finn but you can't tell him much 05/21/2015 at 14:33

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Nope. First stop outside the manifold is the spinny whirly bits. I’ll be pulling the turbo soon to check it out, fingers will be crossed as it was just replaced with a new OEM unit before I bought the car.

greasemonkey235097 > Aero 05/21/2015 at 15:07

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I have the exact damage, mine was an 06 mazda3

pip bip - choose Corrour > Aero 05/22/2015 at 05:26

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that don’t look right.

RustedSprinter > Aero 08/27/2015 at 21:51

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Dumb question but how did you know the valves were bad?

Aero > RustedSprinter 08/27/2015 at 22:02

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Misfire due to zero compression. Took a look at the piston through the spark plug hole and saw no obvious damage. Plus the car wasn’t burning oil, so I ruled out rings or cracks.

RustedSprinter > Aero 08/27/2015 at 22:10

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Zero compression in neutral?

Aero > RustedSprinter 08/27/2015 at 22:20

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There was no compression in that cylinder. Whether it was in neutral or not is irrelevant.