Bob Darrah wrote:

Help!!!

OK, young fellers, this old dog is trying to learn new tricks.  First
off, I've got this 20B spread all over my garage, I took it apart
because the rear rotor was completely full of carbon, the center rotor
was only half full, and the front was clean.  What I need is a proof of
concept engine that I might get 300 hours out of.

My chances of overheating this engine are very high.  For that reason, I
don't want to put any more money than necessary for new parts.  If it
works out, then I will see about a Pro built engine built with new
parts.

The end housings have very little wear and the rotor housings (all
three)  have a slight groove on one edge about .080" wide maybe .003"
deep, with some voids in the chrome in that area. I know that Paul Y
would probably not put this thing back together and he is right if I
were going for 2000 hours..

The seals are what I assume you call a three piece seal--a small
triangle, and an inner and an outer piece that go across the apex of the
rotor.  Just what are these one piece and two piece seals that you have
been talking about lately?  

-Your rotor apex seals slots are probably 2 mm
-wide. This limits you to the two peice or three
-peice seals like you have I think.
-It is rather expensive to machine the rotors
-for 3 mm seals.

-The 3 mm one peice seals were used in very early engines
-and are used in racing engines. I don't think you
-can buy one peice 2 mm seals but I could be wrong.
-Did you mark what apex seal came out of where? 
-If so you could probably re-use them.

-You could also probably  mix and match if you did not
-mind a little hard starting, a worse BSFC and
-a little less low end power. PL 

Is there a ballpark price for them? Under these conditions, is my best
bet just to use the existing seal I have?  They seem to have very little
wear.

-Check them for warpage with a real stright edge. 
-Do you have a two rotor shop manual? PL

And I would sure like a good suggestion on what to do with that baffle
in the exhaust port that originally
directed exhaust gasses to heat the intake manafold.  Any help would be
appreciated!

Thanks

Bob Darrah

-I would cut it out of there and block all passages.
-There is something to be said for heat on the cool side
-of the engine but you are not going to run this engine
-at full power for long periods. PL

-BTW guys please try to limit your message line length to 60
-to 80 characters. Us old guys with small 14" monitors
-have trouble reading those real tiny characters.
 
PL

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