Mailing List flyrotary@lancaironline.net Message #41977
From: Kelly Troyer <keltro@att.net>
Subject: Re: [FlyRotary] Porting
Date: Mon, 17 Mar 2008 14:11:58 +0000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Ernest,
    I sealed up the EGR holes in the center housing by runnung a
7/16" NC tap down them (it will make shallow threads) and
installing a length of 7/16" NC"  "all thread" with a screwdriver
slot cut in one end.........I used Hi-Temp threadlocker on threads
and filled top end with "JB Weld".........Then smooth what extends
into port to match port contours.........A standard tap is a little too
short so I purshased a longer tap for a few dollars..........FWIW
 
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold



 
-------------- Original message from Ernest Christley <echristley@nc.rr.com>: --------------


> Porting an engine with a drill will destroy it.
>
> Plain and simple. No ifs, ands or buts. I have a die grinder, but
> nothing more than a pancake compressor so actually using it is painful.
> I could buy a larger compressor, but then I have to find someplace to
> store it. Having everything else I need to start the porting process, I
> improvised. Chucked the parabolic bit into my drill and had at it.
>
> 4 hours, and only one oopsie, later, I had a nicely ported intake, and a
> drill with a chuck that wobbles like a drunken sailor. I'm talking at
> least 1/2" of play at the tip of the chuck. Fortunately, these drills
> are cheap at Northern Tool. I can get them for $15 when they're on
> sale. The extra handle gives you a lot to hold onto as you're grinding
> away; hence, the single oopsie. You hate for tools to be considered
> disposable, but in this case it worked out really well.
>
> http://ernest.isa-geek.org/Delta/Pictures/ EnginePortingTemplate.jpg
> http://ernest.isa-geek.org/Delta/Pictures/EnginePortingIntermediateHousingRear.j
> pg
>
> http://ernest.isa-geek.org/Delta/Pictures/EnginePortingRearHousing.jpg
> http://ernest.isa-geek.org/Delta/Pictures/EnginePortingIntermediateHousingFront.
> jpg
>
> http://ernest.isa-geek.org/Delta/Pictures/EnginePortingRearHousing2.jpg
>
> http://ernest.isa-geek.org/Delta/Pictures/EnginePortingFrontHousingOopsie.jpg
>
>
>
> --
> Homepage: http://www.flyrotary.com/
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