Sent: Sun, 2 Dec 2007 9:21 pm Subject: [FlyRotary] Porting tools? For those who have done porting on the cast iron end housings; what bits/stones/burrs did you use to open up the intake ports? Does it take several types? Which for rough cuts; which for polishing up? I'm ready to work on my 20B, and want to do a mild street port on the intakes. I have a 'dremel' hi-speed tool, but my bit selection is down to 1 or 2 left. What to buy??? Phil in IL RV-10 in process? ? --? Homepage: http://www.flyrotary.com/? Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html? ________________________________________________________________________ More new features than ever. Check out the new AOL Mail ! - http://o.aolcdn.com/cdn.webmail.aol.com/mailtour/aol/en-us/text.htm?ncid=aolcmp00050000000003 ----------MB_8CA03DEAB86945E_152C_BAD6_MBLK-M26.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"

Phil,

Unless you have the patience of Job don't try to port with a Dremel. It's a fine tool but only for very small work. You need to get a 1/4" die grinder or drill motor. Mikita makes a electric 1/4" die grinder. This is a fine tool, I've been using the same one for 20 YEARS! I also use a flex shaft drill motor with a ball bearing hand piece, again 1/4". Mine is from Domore, but it's ancient. Recovered from a dig like 20+ years ago. It has a foot pedal speed control. I saw a good looking one just like it at a local Woodcraft store @ about $300 for the kit. The cheapest way is the Mikita. You will also need some carbide burrs. Google 1/4" shank carbide die grinding burrs. There are many types. The diamond pattern removes material fastest, and the straight flute smoothes the best. Lots of people polish but it isn't really needed. I like a bead blasted finish personally, but mask carefully or you can ruin the running surface. There are as many ways to do this as people doing it! Good luck. remember max size isn't as important as making all the ports the same size, be consistent.

Bill Jepson

PS. A variable speed unit helps prevent getting into a vibration phase for the cutter and getting "jitters" FWIW

-----Original Message-----
From: Phil White <philwhite9@aol.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sun, 2 Dec 2007 9:21 pm
Subject: [FlyRotary] Porting tools?

For those who have done porting on the cast iron end housings; what bits/stones/burrs did you use to open up the intake ports? Does it take several types? Which for rough cuts; which for polishing up? I'm ready to work on my 20B, and want to do a mild street port on the intakes. I have a 'dremel' hi-speed tool, but my bit selection is down to 1 or 2 left. What to buy??
Phil in IL RV-10 in process

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