Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Wed, 25 Sep 2002 17:37:40 -0400 Message-ID: X-Original-Return-Path: <13brv3@mchsi.com> Received: from sccmmhc02.mchsi.com ([204.127.203.184] verified) by logan.com (CommuniGate Pro SMTP 4.0b8) with ESMTP id 1790630 for flyrotary@lancaironline.net; Wed, 25 Sep 2002 09:33:23 -0400 Received: from rad ([12.218.64.232]) by sccmmhc02.mchsi.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20020925133323.JFMF7903.sccmmhc02.mchsi.com@rad> for ; Wed, 25 Sep 2002 13:33:23 +0000 Reply-To: <13brv3@mchsi.com> From: <13brv3@mchsi.com> X-Original-To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Wastegates & engine stuff X-Original-Date: Wed, 25 Sep 2002 08:33:23 -0500 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 What turbo are you or others planning on using? Is anyone planning on using the stock turbo? --------------- Stock turbo here, a series 5 (89-91) for the RV-3 (another fit for Van). I'm currently planning to use a vernier cable to actuate the internal wastegate on the turbo. The plan will be to leave it open initially, then start closing it during further testing. Ultimately, I can imagine finding a "safe" minimum boost position for full time use, then the boost can be dialed in at altitude for normalization. Since I won't have an intercooler, I'll have to be mindful of the intake air temp, and may only be able to use significant boost at altitude, where the air is very cold. Also, my engine is one of the new '86 spec motors, with 8.5 compression, so I should be able to get away with more boost than you. If I were building the motor from scratch, I would have used the NA rotors, and still normalized with the turbo. I don't see any significant danger there. Those that are familiar with the stock turbo, could someone clarify what the purpose of the switching valve is and is it necessary in my application? The actuator for this is fairly large & heavy. I'd like to leave it out if possible. ------------------------- Are you talking about the internal wastegate? Is it the lever that's actuated by a big spring loaded vacuum pot? BTW- which turbo is this? What year range was it used? I have built my own intake manifold, which I'm attaching a pic of for comments. I decided that since I will be turbocharging, I could get away without a tuned intake. Any thoughts on this? ------------------------- Looks fine to me. I'm also planning to use the brute force method of "tuning" for my intake. I see that as one of the ways that using a turbo actually makes the installation easier. Cheers, Rusty