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White powder on the valves and turbo – E85
Posted: Mon May 03, 2010 11:30 am
by Christos Adam
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?
Re: White powder on the valves and turbo – E85
Posted: Mon May 03, 2010 11:56 am
by Jonathan Lugod
A "good" exhaust valve that is sealing and holding compression will usually have white or tan colored ash deposits on it.
Re: White powder on the valves and turbo – E85
Posted: Mon May 03, 2010 1:15 pm
by Christos Adam
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...
Re: White powder on the valves and turbo – E85
Posted: Mon May 03, 2010 1:45 pm
by Mako Koiwai
Doesn't White, as opposed to light tan, indicate a bit hot?
My WRX Turbo ... 95 octane mix:
Re: White powder on the valves and turbo – E85
Posted: Mon May 03, 2010 3:07 pm
by Casey Brier
I've always thought that meant "too lean"..... but thats on normal gasoline. I dont knwow if E-85 is the same?
Re: White powder on the valves and turbo – E85
Posted: Mon May 03, 2010 3:19 pm
by Bob Beamesderfer
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.
