Return-Path: Sender: (Marvin Kaye) To: flyrotary@lancaironline.net Date: Tue, 13 Jan 2004 08:34:44 -0500 Message-ID: X-Original-Return-Path: Received: from wb1-a.mail.utexas.edu ([128.83.126.134] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP-TLS id 2928914 for flyrotary@lancaironline.net; Mon, 12 Jan 2004 10:06:58 -0500 Received: (qmail 3403 invoked from network); 12 Jan 2004 15:06:56 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO benefits3.mail.utexas.edu) (146.6.191.101) by wb1.mail.utexas.edu with RC4-SHA encrypted SMTP; 12 Jan 2004 15:06:56 -0000 X-Original-Message-Id: <5.1.1.5.2.20040112090547.02b44598@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 X-Original-Date: Mon, 12 Jan 2004 09:06:49 -0600 X-Original-To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Re: Success In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_-745404671==.ALT" --=====================_-745404671==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Paul, I was able to tap mine to 3/8 NPT which left adequate wall thickness. Mark S. At 09:54 AM 1/12/2004 -0500, you wrote: >Hi, Finn....By the time I drilled and tapped the hole for 1/2 NPT, the >remaining wall would be so thin, I was afraid it would break during the >tapping operation. The housing is cast iron, and a pipe tap is tapered, >so it tries to expand the hole while tapping. Not a good situation when >you have thin walls, expecially if those thin walls are cast iron. Take >care. Paul Conner >----- Original Message ----- >From: Finn Lassen >To: Rotary motors in aircraft >Sent: Sunday, January 11, 2004 11:11 PM >Subject: [FlyRotary] Re: Success > >I curious as to why you didn't simply thread the housing with 1/2" NPT and >used the fitting unaltered. > >Finn > >sqpilot@earthlink wrote: >> The second item I had success with was the 5/8" heater nipple that >> is a press fit into the engine, underneath the oil filter. Mine was >> missing from my engine. I tried to find a new one, with no success. >> Finally, Mazdatrix sent a used one, but when I put a micrometer to it, >> it was considerably out of round (probably caused during removal from >> the casting). >> >> I found at our local CarQuest auto parts store, a steel 5/8" hose >> barb to a 1/2" NPT male fitting. I just put it in a lathe, and turned >> the 1/2" NPT threaded area down to 17 mm, or .160 inches. In the >> picture, you will see the longer original piece, as well as the new, >> slightly shorter nipple. --=====================_-745404671==.ALT Content-Type: text/html; charset="us-ascii" Paul,
I was able to tap mine to 3/8 NPT which left adequate wall thickness.

Mark S.

At 09:54 AM 1/12/2004 -0500, you wrote:

Hi, Finn....By the time I drilled and tapped the hole for 1/2 NPT, the remaining wall would be so thin, I was afraid it would break during the tapping operation. The housing is cast iron, and a pipe tap is tapered, so it tries to expand the hole while tapping. Not a good situation when you have thin walls, expecially if those thin walls are cast iron. Take care. Paul Conner

----- Original Message -----
From: Finn Lassen
To: Rotary motors in aircraft
Sent: Sunday, January 11, 2004 11:11 PM
Subject: [FlyRotary] Re: Success

I curious as to why you didn't simply thread the housing with 1/2" NPT and used the fitting unaltered.

Finn

sqpilot@earthlink wrote:

The second item I had success with was the 5/8" heater nipple that is a press fit into the engine, underneath the oil filter. Mine was missing from my engine. I tried to find a new one, with no success. Finally, Mazdatrix sent a used one, but when I put a micrometer to it, it was considerably out of round (probably caused during removal from the casting).

I found at our local CarQuest auto parts store, a steel 5/8" hose barb to a 1/2" NPT male fitting. I just put it in a lathe, and turned the 1/2" NPT threaded area down to 17 mm, or .160 inches. In the picture, you will see the longer original piece, as well as the new, slightly shorter nipple.

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