X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from vms042pub.verizon.net ([206.46.252.42] verified) by logan.com (CommuniGate Pro SMTP 5.0) with ESMTP id 813231 for flyrotary@lancaironline.net; Thu, 03 Nov 2005 08:46:43 -0500 Received: from verizon.net ([71.99.168.186]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IPD005C0SXLWU60@vms042.mailsrvcs.net> for flyrotary@lancaironline.net; Thu, 03 Nov 2005 07:46:34 -0600 (CST) Date: Thu, 03 Nov 2005 08:46:32 -0500 From: Finn Lassen Subject: Re: [FlyRotary] Another Run - with Questions In-reply-to: To: Rotary motors in aircraft Message-id: <436A14B8.5020703@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------050002000702050304050809 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------050002000702050304050809 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Joe Hull wrote: > I ran the engine for an hour straight tonight. It seemed to run well > but I do have a couple of questions that maybe this esteemed group can > comment on. > > > > 1. Engine starts out at about 1300RPM at idle when cold and Oil PSI > briefly is 81PSI and then drops to 65 or so after 15-20 seconds. > Then as things warm up the RPM's increase and oil pressure > drops. RPM levels out at about 1550 and oil pressure hovers > around 30PSI. Is 30PSI an OK oil pressure level at that RPM? I > did increase the RPM briefly toward the end of the hour and oil > pressure did go up. At 1900-2000 RPM oil pressure was around 50PSI. > I think the factory manual says at least 1 PSI per 100 RPM so it looks like you're fine. > 1. > 2. > 3. EGT's are 2000-2050F. Seems a tad high to me!! My EGT probes > are located about 2.5" from the rotor housing. When I shut it > down my exhaust manifold/muffler was a very nice glowing red. > It's made out of Inconel and is .06 thick so it seems to hold up > pretty well. But if it's like this at 1600RPM what's it going > to be at 5800RPM?? > What does your fuel mixture meter show? I guess you could be running so rich that you have a nice fire going in the headers... Finn > > > > --------------050002000702050304050809 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Joe Hull wrote:

I ran the engine for an hour straight tonight. It seemed to run well but I do have a couple of questions that maybe this esteemed group can comment on.

 

  1. Engine starts out at about 1300RPM at idle when cold and Oil PSI briefly is 81PSI and then drops to 65 or so after 15-20 seconds. Then as things warm up the RPM’s increase and oil pressure drops.  RPM levels out at about 1550 and oil pressure hovers around 30PSI.  Is 30PSI an OK oil pressure level at that RPM?  I did increase the RPM briefly toward the end of the hour and oil pressure did go up. At 1900-2000 RPM oil pressure was around 50PSI.
I think the factory manual says at least 1 PSI per 100 RPM so it looks like you're fine.
  3. EGT’s are 2000-2050F.  Seems a tad high to me!!  My EGT probes are located about 2.5” from the rotor housing.  When I shut it down my exhaust manifold/muffler was a very nice glowing red.  It’s made out of Inconel and is .06 thick so it seems to hold up pretty well.  But if it’s like this at 1600RPM what’s it going to be at 5800RPM??
What does your fuel mixture meter show? I guess you could be running so rich that you have a nice fire going in the headers...


Finn

 

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