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Date: Sun, 03 Oct 2004 07:36:50 -0500
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Progress on the rebuild (Update Oct 3)
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Well, I ground/cut out the porting templates, since as shipped by Racing 
Beat they are essentially slabs of aluminum with the port dimensions 
scribed on them.
 
After making the holes, I took a normally aspirated endplate (from a 
junk core I retrieved from Chris) and took a look at practice porting. 
Well, the end housings it appeared there really wasnt much room to do 
anything to.. so I grabbed the intermediate housing and marked up ONE 
side of it and left the other side undone for comparison. I figure I 
spent maybe 2 hours grinding, polishing, grinding some more and finally 
getting a nice, open, contoured intake port.
 
I marked up some housings from the turbo but did not start on them 
(hey.. gotta pace myself). A closer look at the intermediate housing on 
the turbo told me right away that I would not be able to extend the port 
to the dimensions allowed by the template. I would be able to extend the 
port downward and towards the outside.. but the water jacket arrangement 
is VERY different on the turbo compared to the normally aspirated engine 
in the intermediate housing... and trying to extend the port upward 
would cause communication with the water jacket.
 
Oh well, I will take what I can get, and even a modest increase in port 
size will improve the volumetric efficiency of the engine. From an 
intake standpoint, I am very interested in doing something like Ed 
Anderson has shown on his website and using the throttle body from the 
stock intake and fashioning intake fittings to feed the primaries and 
secondaries. Of note, as much as I've been reading and learning about 
these engines, it just dawned on me that the inboard/center ports (that 
feed the intermediate housing) are the considered the primary runners. 
You learn something new every day..
 
I'm watching ebay for another flywheel sale, and have seen some 
superlight flywheels for sale.. thing is I need to get the counterweight 
to go with things, since my engine is a manual tranny core.. with the 
big heavy flywheel on it now (well, sitting against the wall).
More to follow later.

Dave