White powder on the valves and turbo – E85

Christos Adam · Post by **Christos Adam** » Mon May 03, 2010 11:30 am

After the last pro solo event in El-Toro I decided to remove my turbo since I had a huge an air leak between the exhaust manifold and the turbo.
To my surprise I noticed the turbo and the valves had a white coating on them.
I wasn’t expecting to see carbon deposits since I run E85 but what is these white stuff?

Jonathan Lugod · Post by **Jonathan Lugod** » Mon May 03, 2010 11:56 am

A "good" exhaust valve that is sealing and holding compression will usually have white or tan colored ash deposits on it.

Christos Adam · Post by **Christos Adam** » Mon May 03, 2010 1:15 pm

Jonathan Lugod wrote:A "good" exhaust valve that is sealing and holding compression will usually have white or tan colored ash deposits on it.

Thanks Jonathan, good to know that...

Mako Koiwai · Post by **Mako Koiwai** » Mon May 03, 2010 1:45 pm

Doesn't White, as opposed to light tan, indicate a bit hot?

My WRX Turbo ... 95 octane mix:

Casey Brier · Post by **Casey Brier** » Mon May 03, 2010 3:07 pm

I've always thought that meant "too lean"..... but thats on normal gasoline. I dont knwow if E-85 is the same?

Bob Beamesderfer · Post by **Bob Beamesderfer** » Mon May 03, 2010 3:19 pm

Casey Brier wrote:I've always thought that meant "too lean"..... but thats on normal gasoline. I dont knwow if E-85 is the same?

It did when reading plugs, but I wonder if because this is outside of the combustion chamber whether it means the same thing.

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White powder on the valves and turbo – E85

White powder on the valves and turbo – E85

Re: White powder on the valves and turbo – E85

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Re: White powder on the valves and turbo – E85

Re: White powder on the valves and turbo – E85

Re: White powder on the valves and turbo – E85