Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Thu, 22 May 2003 22:00:46 -0400 Message-ID: X-Original-Return-Path: Received: from rly-ip05.mx.aol.com ([64.12.138.9] verified) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2359840 for flyrotary@lancaironline.net; Thu, 22 May 2003 21:11:14 -0400 Received: from logs-wk.proxy.aol.com (logs-wk.proxy.aol.com [205.188.198.135]) by rly-ip05.mx.aol.com (v90_r2.6) with ESMTP id RELAYIN10-0522211000; Thu, 22 May 2003 21:10:00 -0400 Received: from office (AC818280.ipt.aol.com [172.129.130.128]) by logs-wk.proxy.aol.com (8.12.9/8.12.9) with ESMTP id h4N16NGS256573; Thu, 22 May 2003 21:07:03 -0400 (EDT) From: "Marc Wiese" X-Original-To: "ACRE NL" , "Flyrotary" Subject: interesting info...... X-Original-Date: Thu, 22 May 2003 20:06:26 -0500 X-Original-Message-ID: <000301c320c7$8ce674c0$808281ac@office> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.3416 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Apparently-From: Gary34807@aol.com OK. Who has heard of "Checkpoint"? Date: Mon, 19 May 2003 10:22:12 -0700 From: Eric.L.Wells@health.net Subject: (rx7) Update on blown motor - might not be cracked rotor Well, the saga of my third rebuild entered the 'wow, a lot of stuff broke inside' phase. The crack we saw in the rotor may just be a casting flaw towards the tip of the rotor. We are going to have it Magnafluxed (along with the housings) to confirm - when we look at the apex seal slot, it doesn't look like there is a crack. It could be so fine we can visualize it with the naked eye, so the Magnaflux should confirm. However, the bits of broken corner seal and broken side seals that fell out as I took each layer apart definitely indicate that something went boom. What was amazing was that the motor, in that state (one cracked side seal and corner seal in EACH rotor) still made a 114 mph quarter mile pass .... it just hard started and idled like crap. The Hurley apex seals don't have a scratch on them! I know that some people have been debating on the durability of Hurleys, but my shop is convinced. They've not seen side seals break at all - corner and apex seals sure, but not side seals. Usually the apex goes first. Anyway, my apex seals were fine. My housings show a LOT of wear after only 6K miles - looks more like 100K of wear. I'll be joining the group that adds premix to their cars due to this. Checkpoint has been contemplating building a bypass kit that routes fresh oil from an external canister to the omp vs. using internal motor oil .... I'm not sure if I'm ready to try another prototyping adventure until we get the turbos built correctly. One prototyped part at a time, please. So, next week we clean up the parts and send them for Magnafluxing, then to Cam for dowel pinning, then back home for a good ol fashioned port job. We are thinking of radiusing the e-shaft and also will install competition side seals that are available from Mazdacomp for a couple extra bucks a seal. Per Mazdacomp's website, these have additional sealing pressure. We were thinking of putting in lightened 89 NA rotors for added compression :-) , but Mazdacomp's website says those will run a cool $2400 .... uh, I think I'll wait. More to come.... elw Marc Wiese