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Date: Tue,  5 Oct 2004 22:19:28 -0700
From: Todd Bartrim <haywire@telus.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: Low power 13B Operation
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I took off the exhaust manifold and, sure enough, two of the seals are shiny 
and spring back about 1/16 inch when you press them (hard). The other seal is 
intact, but not shiny and only springs back maybe 1/32 when pushed. It IS 
moving, so it's not a stuck seal - sounds like the side seals are gone. We'll 
know more when the Mazda guy gets the engine comes apart......


Hi John;
   After my little detonation adventure, I had similar compression results, as 
I'd expected, but as I began to prepare to pull the engine off the airframe, I 
first removed the turbo manifold just to see how bad the seals were. I was 
shocked to see them looking perfect, with shiny surfaces and spring in each 
seal. I couldn't understand this so I replaced the turbo on the block and 
tried again & again, even phoning Tracy's to have him tell me what I already 
knew, but didn't want to accept.
   After bringing the engine home and tearing it down that night (yes it 
really is that fast & easy.. well at least to pull it apart :-)), I was 
surprised at the way the apex seals were broken and were they ever broken, but 
from through the exhaust port all looked well. Pictures should be in the 
archives.
   I'm not suggesting that you detonated back when you were blowing turbos, 
but maybe something to consider.

Todd Bartrim     (giving Rusty more John ammo) (I'm really sick of school)

C-FSTB RV-9endurance
13B Turbo