Rusty, you better check with a turbo specialist. The valve could be a just a regular check valve that will open at 1/2 psi. Buly

Don't worry Buly, whoever sells me the new turbo will be providing plenty of professional advice and support, or they won't be selling me anything.  I also have a lot of research to do, which basically means sitting back and letting Dave or John figure out what works. 

 

Cheers,

Rusty (single rotor block sitting on the Kolb mount)

 

 

Rusty, the "oil seal" is not really so much of a seal as it is a plate that covers the center section and prevents most of the pressurized exhaust from getting into the center section.  It is held in place by exhaust pressure.  Any oil behind it will run freely into the exhaust.

When I first was running my engine I had a -6 aluminum tube in a short portion of the return.  I figured (despite what everyone kept saying) that would be plenty as there was a 1/16 restrictor on the inlet....  Well, it wasn't.  The despite the fact that it was downhill all the way, surface tension in the line must have created just enough back pressure, and the exhaust was full of smoke.  I even sent the turbo back to the guy who re-built it saying that the "seal" was broken.  He say everything was fine and again suggested that my return wasn't big enough...  So I broke down, and though I didn't think it would work, I enlarged the entire return to 1/2 inch pipe...  that fixed the problem.

--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/vp4skydoc/index.html