X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2553584 for flyrotary@lancaironline.net; Mon, 03 Dec 2007 11:37:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta05.mail.rr.com with SMTP id <20071203163647.GZFJ8432.cdptpa-omta05.mail.rr.com@edward2> for ; Mon, 3 Dec 2007 16:36:47 +0000 Message-ID: <000d01c835ca$bbd3b960$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Porting tools? Date: Mon, 3 Dec 2007 11:37:02 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C835A0.D2AA3A30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C835A0.D2AA3A30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Phil Several have already offered good advise on bits and tools to do the = porting job, so I won't try to add to that. However, one question I do = have is do you have a template to draw the outline of the port? I = recommend one highly - particularly if this is your first porting job. Porting is fairly easy provided you are careful with the tools and go = gently - don't try to hog out to much at one pass. I put several layers = of duct tape on the running surface of the side housing all the way up = to the outline of the new port - if a bit gets away from you - this = tape (or something similar) can prevent damage to the running surfaces = by a run-a-way bit. Believe me it can easily happen. I found that out = - fortunately on an old junk housing I practiced on. Ed. =20 ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in aircraft=20 Sent: Monday, December 03, 2007 11:14 AM Subject: [FlyRotary] Re: Porting tools? 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.=20 Bill Jepson PS. A variable speed unit helps prevent getting into a vibration phase = for the cutter and getting "jitters" FWIW=20 -----Original Message----- From: Phil White To: Rotary motors in aircraft 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??=20 Phil in IL RV-10 in process=20 =20 --=20 Homepage: http://www.flyrotary.com/=20 Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html=20 -------------------------------------------------------------------------= ----- More new features than ever. Check out the new AOL Mail! ------=_NextPart_000_000A_01C835A0.D2AA3A30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Phil
 
Several have already offered good advise on bits = and tools=20 to do the porting job, so I won't try to add to that.  However, one = question I do have is do you have a template to draw the outline of the=20 port? I recommend one highly - particularly if this is your first = porting=20 job.
 
 Porting is fairly easy provided you are = careful with=20 the tools and go gently - don't try to hog out to much at one = pass.  I put=20 several layers of duct tape on the running surface of the side housing = all the=20 way up to the outline of the new port - if a bit gets away from you - =  this=20 tape (or something similar) can prevent damage to the running surfaces = by a=20 run-a-way bit.  Believe me it can easily happen.  I found that = out=20 - fortunately on an old junk housing I practiced on.
 
Ed. 
----- Original Message -----
From:=20 wrjjrs@aol.com
Sent: Monday, December 03, 2007 = 11:14=20 AM
Subject: [FlyRotary] Re: = Porting=20 tools?

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


-----Original=20 Message-----
From: Phil White <philwhite9@aol.com>
To: = Rotary=20 motors in aircraft <flyrotary@lancaironline.net>
Sent: Sun, 2 = Dec=20 2007 9:21 pm
Subject: [FlyRotary] Porting tools?

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