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Certainly better the cheap drill than the engine {:>). Looks good. Regarding the Oops, when I port an engine I found that if you lay some duct tape around the port on the housing, it will reduce the odds of Oops damage caused by the bit running across the housing surface.
Ed
----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, March 17, 2008 9:35 AM
Subject: [FlyRotary] Porting
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.jpg
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 <http://ernest.isa-geek.org/Delta/Pictures/EnginePortingFrontHousingOopsie.jpg>
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