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Ceramic Coating Valves?

 
Old 10-15-2010, 12:59 PM
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Default Ceramic Coating Valves?

Iím thinking about having my valves coated with a Ceramic thermal barrier. Cost about $7.50 a valve to do.

The piston tops are coated now.

Anybody have any experience with having ceramic coatings on combustion chamber stuff?

Bob
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Old 10-15-2010, 02:02 PM
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I've had CC and exhaust ports coated. If you are using stock valves it is possible that the coating will stick to the valve faces. However aftermarket valves, I had Supertech, it might not. The coating would not adhere to the nitride coating bonded to the surface.
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Old 10-15-2010, 02:19 PM
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Originally Posted by neogenesis2004 View Post
I've had CC and exhaust ports coated. If you are using stock valves it is possible that the coating will stick to the valve faces. However aftermarket valves, I had Supertech, it might not. The coating would not adhere to the nitride coating bonded to the surface.
Good to know. Yes they are aftermarket valves and nitrided. wonder if the nitriding could be sanded off the face first?

Looks like doing the combustion chambers is about $100 think its worth it?

Bob
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Old 10-15-2010, 02:23 PM
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Bob, I assume you're trying to avoid burning another valve? Talk to Supertech about whether they can make you a set of Inconel valves. They make them for other applications in the $25-30/ea range.
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Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 10-15-2010, 02:29 PM
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You burnt up a Supertech valve? Wow...
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Old 10-15-2010, 03:21 PM
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Picure is the is the first time it happened. back side of the valve looked like a blow torch was used on it.

Second time it happened after compleat engine rebuild rewired entire car new injectors and compleatly different engine management tuned by FM then double checked at another tuner. It burned the other exhaust valve in the same cylinder after it started consuming oil.

Bob
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Old 10-15-2010, 03:58 PM
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was that from retarded timing or what?
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Old 10-15-2010, 04:19 PM
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wow i cant say ive even seen a more cleaner burnt through valve. +2 on how that happened
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Old 10-15-2010, 04:51 PM
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Originally Posted by y8s View Post
was that from retarded timing or what?
Ive been running the exact same timing and the same fuel map adjusted down to compensate for less displacement on a stock motor for most of the year after the second time this has happend. It hasn't started burning oil or an exhaust valve yet.

I would sure like to know what caused this no one knows for sure that I have found. I think it has something to do with excess oil in the combustion chamber. The only way I can find that it could be getting there is past the rings though. It did not have a huge amount of blow by when it did it either both the pan and the valve cover were vented to atmospere and smoke was not blowing out the breather and it was not filling up with oil quickly. Spark plug would be wet with oil after a tool around the neigborhood though and going hard into boost would send oil smoke out the tailpipe just prior to both times it did this.

The two times it happened were with entirely different ecu's, ignition systems, injectors, fule pumps, fuel pressure regulators, entire chassis wireing, etc. I don't think it has anything to do with engine management I think it is a mechanical issue.

It was being pushed to around 360 rwhp and pushed fairly well on the track however.

Bob

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Old 10-16-2010, 07:55 PM
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How are the valve seats? Most of the heat absorbed by the valves is dissipated into the seat, so if there were some reduction in seat to valve contact area it could contribute to burning the valve. Also, it would likely not be a good idea to coat the whole valve since doing so would reduce cooling ability. Would it be possible to port the head to increase the turbulence in the chamber to reduce combustion time and avoid flowing burning charge over the exhaust valve? Is there any chance that the cam timing might be a touch off, leading to early opening?
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Old 10-16-2010, 08:37 PM
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There's always copper valve coatings with Beryllium seats:


If you want to go with the ultimate in thermal conductivity, and carcinogens.
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Old 10-17-2010, 09:16 AM
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Originally Posted by Savington View Post
Bob, I assume you're trying to avoid burning another valve? Talk to Supertech about whether they can make you a set of Inconel valves. They make them for other applications in the $25-30/ea range.
Manley will make them too. My guy there said they could use the subaru? inconel forging to make a miata valve.
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