X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 26 Sep 2005 23:19:52 -0400 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.98.211.24] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTPS id 733866 for lml@lancaironline.net; Mon, 26 Sep 2005 16:30:49 -0400 Received-SPF: none receiver=logan.com; client-ip=68.98.211.24; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.4/8.13.4/Debian-3) with SMTP id j8QKTWiK014050 for ; Mon, 26 Sep 2005 13:29:32 -0700 X-Original-Message-ID: <020a01c5c2d8$91ac7490$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: Drilled Brake Rotor X-Original-Date: Mon, 26 Sep 2005 13:26:21 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0203_01C5C29D.E22C8670" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 X-Virus-Scanned: ClamAV 0.86.2/1102/Sun Sep 25 07:04:56 2005 on systems3.net X-Virus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0203_01C5C29D.E22C8670 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Rob said: Another thing to keep in mind with drilled rotors (and to a = lesser degree slotted rotors as well) is that the holes lower the = thermal mass of the rotor. This causes the rotor to heat up faster under = the same heat input. Rob, the thermal mass is decreased but the radiant heat surface area is = increased. My intuition is that the overall heat rejection is improved = with holes. I hear people complaining about warped rotors on the IV-P = and if this is true then the rotors are getting hot. I raced a Triumph = TR4 (big lizard era) with solid rotors and the rotors would get so hot = and warped, the rotors would knock the pads back. The 1st full push on = the brake pedal after a straightaway would not produce any braking at = all. Craig Berland ------=_NextPart_000_0203_01C5C29D.E22C8670 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Rob said: Another thing to keep in mind with drilled rotors = (and to a=20 lesser degree slotted rotors as well) is that the holes lower the = thermal mass=20 of the rotor. This causes the rotor to heat up faster under the same = heat=20 input.

Rob, the thermal mass is decreased but the radiant heat surface = area is=20 increased. My intuition is that the overall heat rejection is = improved=20 with holes. I hear people complaining about warped rotors on the IV-P = and if=20 this is true then the rotors are getting hot. I raced a Triumph = TR4 (big=20 lizard era) with solid rotors and the rotors would get so hot = and=20 warped, the rotors would knock the pads back. The 1st full push on = the=20 brake pedal after a straightaway would not produce any braking at = all.

Craig Berland

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