X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [201.225.225.169] (HELO cwpanama.net) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 972052 for flyrotary@lancaironline.net; Mon, 06 Feb 2006 10:02:27 -0500 Received-SPF: none receiver=logan.com; client-ip=201.225.225.169; envelope-from=rijakits@cwpanama.net Received: from [201.224.93.110] (HELO usuarioq3efog0) by frontend3.cwpanama.net (CommuniGate Pro SMTP 4.2.10) with SMTP id 57852201 for flyrotary@lancaironline.net; Mon, 06 Feb 2006 10:08:32 -0500 Message-ID: <000c01c62b2e$3152d580$6e5de0c9@usuarioq3efog0> From: "rijakits" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Torque and torque sequence Date: Mon, 6 Feb 2006 10:01:21 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C62B04.4818B480" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C62B04.4818B480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Here something to ponder: I ran across a report to the Mistral factory in Switzerland by Mickey Coggins, a Swiss RV-8 builder: http://www.rv8.ch/article.php?story=20060202202829108 besides a lot of interesting info on Mistral he has a list of more interesting topics: http://www.rv8.ch/search.php?mode=search&type=stories&author=2 one of them is about "torque to yield": http://www.rv8.ch/article.php?story=20051227112926716 Thomas J. ----- Original Message ----- From: Lehanover@aol.com To: Rotary motors in aircraft Sent: Monday, February 06, 2006 9:19 AM Subject: [FlyRotary] Re: Torque and torque sequence On the piston engines, (Fiat) we retorqued after each heat cycle. I have the record for reusing the same head gasket on the dyno engine, after changing cams or a port shape, I got to 13 before it let go. The procedure is to back off the bolt a turn, and run back up to the torque, without stopping the wrench. Checking a torqued bolt once it stops turning, tells you nothing. It can be under torqued, and still click the wrench set at a higher number than that bolt was torqued too. So you get into the habit of the wrench moving right through the click. The torque was supposed to be 55 pounds dry, but we used 50 pounds with hypoid on the threads and anti-seize under the heads and both sides of the washer. We were really leaning on that (stock) gasket with 245 pounds of cranking compression. We did loose many bolts. Some while torqueing up, and some after one heat cycle, because we were in the upper end of their working range at 50 pounds. So a heat cycle would really load them up, when the aluminum head got a bit taller. I used only bolts from the dyno engine, (used bolts) as so many stock bolts were faulty right out of the box. Even if the two bolts were left loose, the whole sequence needs to be run. If there is no oil in the water, or oil leaks between the irons and the rotor housings, or water in the oil, I would retorque the whole mess and forget it. Never heard of a Fiat race car? We had a qualifying lap record, and won the race one year, at Elkhart Lake's Road America. Lynn E. Hanover ------=_NextPart_000_0008_01C62B04.4818B480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Here something to ponder:

I ran across a report to the Mistral factory in = Switzerland by=20 Mickey Coggins, a Swiss RV-8 builder: =

http://w= ww.rv8.ch/article.php?story=3D20060202202829108

besides a lot of interesting info on Mistral he has = a list of=20 more interesting topics:

http://www.rv8.ch/search.php?mode=3Dsearch&type=3Dstorie= s&author=3D2

one of them is about "torque to yield":

http://w= ww.rv8.ch/article.php?story=3D20051227112926716

Thomas J.

----- Original Message -----
From:=20 Lehanover@aol.com
To: Rotary motors in = aircraft

Sent: Monday, February 06, 2006 = 9:19=20 AM

Subject: [FlyRotary] Re: Torque = and=20 torque sequence

On the piston engines, (Fiat) we retorqued after each heat cycle. = I have=20 the record for reusing the same head gasket on the dyno engine, after = changing=20 cams or a port shape, I got to 13 before it let go.

The procedure is to back off the bolt a turn, and run back = up to the=20 torque, without stopping the wrench. Checking a torqued bolt once it = stops=20 turning, tells you nothing. It can be under torqued, and still click = the=20 wrench set at a higher number than that bolt was torqued too.

So you get into the habit of the wrench moving right through the=20 click.

The torque was supposed to be 55 pounds dry, but we used 50 = pounds with=20 hypoid on the threads and anti-seize under the heads and both sides of = the=20 washer. We were really leaning on that (stock) gasket with 245 pounds = of=20 cranking compression. We did loose many bolts. Some while = torqueing=20 up, and some after one heat cycle, because we were in the upper = end of=20 their working range at 50 pounds. So a heat cycle would really load = them up,=20 when the aluminum head got a bit taller. I used only bolts from the = dyno=20 engine, (used bolts) as so many stock bolts were faulty right out of = the box.=20

Even if the two bolts were left loose, the whole sequence needs = to be=20 run. If there is no oil in the water, or oil leaks between the irons = and the=20 rotor housings, or water in the oil, I would retorque the whole mess = and=20 forget it.

Never heard of a Fiat race car? We had a qualifying lap record, = and won=20 the race one year, at Elkhart Lake's Road America.

Lynn E. Hanover

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