Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 402276 for flyrotary@lancaironline.net; Wed, 08 Sep 2004 11:50:32 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i88Fo0Ns011204 for ; Wed, 8 Sep 2004 11:50:01 -0400 (EDT) Message-ID: <002901c495bb$7fb30c40$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: Core Tank Measurements Date: Wed, 8 Sep 2004 11:50:00 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01C49599.F86833D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0026_01C49599.F86833D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Joe, the cores I had in the shop measured from 3 3/8" to 3 5/8" in = thickness otherwise the dimensions were the same. Dave, the tanks of the core I cut open has a center hole running down = from top to bottom through the cross tube/plates and two smaller holes = on each side of the center hole. There was no tube just the hole. Center hole diam 0.865", side holes diam were .435". =20 Total width of tank from front of core to back was 3.25" slightly = smaller than the core thickness at the outer edges of the tank. =20 From core side to outside tank was a max of 1.25" and a min (where the = tank squeezes in) to 1" The thickness of the bottom plate (where the tubes were) was 0.125" but = it was brazed to a cross plate giving it a total thickness of .175" I recommend using a mill or hole saw being carefully not to descend too = far and nick one of the plates where it curves in. You can use a = regular 1" drill but the changes of nicking the side of the tank = increase. It may be so small that you don't notice it until you have = the core underpressure - then it leaks. Clearly this may not be representative of all GM cores. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ------=_NextPart_000_0026_01C49599.F86833D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Joe, the cores I had in the shop = measured from 3=20 3/8" to 3 5/8" in thickness otherwise the dimensions were the = same.
 
Dave, the tanks of the core I cut open = has a center=20 hole running down from top to bottom through the cross tube/plates and = two=20 smaller holes on each side of the center hole.  There was no tube = just the=20 hole.
 
Center hole diam  0.865", side = holes diam were=20 .435". 
 
Total width of tank from front of core = to back=20 was 3.25" slightly smaller than the core thickness at the outer = edges of=20 the tank.
 
From core side to outside tank was a = max of 1.25"=20 and a min (where the tank squeezes in) to 1"
 
The thickness of the bottom plate = (where the tubes=20 were) was 0.125"  but it was brazed to a cross plate giving it = a total=20 thickness of .175"
 
I recommend using a mill or hole saw = being=20 carefully not to descend too far and nick one of the plates where it = curves=20 in.  You can use a regular 1" drill but the changes of nicking the = side of=20 the tank increase.  It may be so small that you don't notice it = until you=20 have the core underpressure - then it leaks.
 
Clearly this may not be representative = of all GM=20 cores.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary=20 Powered
Matthews, NC
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