X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cpoproxy1-pub.bluehost.com ([69.89.21.11] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with SMTP id 4674622 for flyrotary@lancaironline.net; Fri, 14 Jan 2011 09:39:49 -0500 Received-SPF: pass receiver=logan.com; client-ip=69.89.21.11; envelope-from=jslade@canardaviation.com Received: (qmail 4586 invoked by uid 0); 14 Jan 2011 14:39:12 -0000 Received: from unknown (HELO host296.hostmonster.com) (66.147.240.96) by cpoproxy1.bluehost.com with SMTP; 14 Jan 2011 14:39:12 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=canardaviation.com; h=Received:Message-ID:Date:From:Reply-To:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type:X-Identified-User; b=He2UVRKsWQJU0Zs0G5dJ7S50XYA2jz9Ae8rlWOb5lCYQAjwaOxNQRmLCt+ao47SQNPgG4QTgryrwxhmU+8Cbc621Jy9/cRgPcVbdqxt15FkAnMxzu5eVQgylYBeK0oo+; Received: from c-174-61-10-12.hsd1.fl.comcast.net ([174.61.10.12] helo=[192.168.1.4]) by host296.hostmonster.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69) (envelope-from ) id 1Pdko3-0004kl-Mk for flyrotary@lancaironline.net; Fri, 14 Jan 2011 07:39:12 -0700 Message-ID: <4D30602F.2090503@canardaviation.com> Date: Fri, 14 Jan 2011 09:39:43 -0500 From: John Slade Reply-To: jslade@canardaviation.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Apex seal update cont with pix of rotor andapexseals References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------090504080208040403080906" X-Identified-User: {3339:host296.hostmonster.com:instanu1:canardaviation.com} {sentby:smtp auth 174.61.10.12 authed with jslade+canardaviation.com} This is a multi-part message in MIME format. --------------090504080208040403080906 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit This doesn't make sense, Chris. In the early days with the fixed pitch prop I could HEAR detonation starting during the runup. I throttled back a bit and it went away. My seals were undamaged. I boost 5 - 7 lbs. (44map). The one thing that jumped out from your list that I never did was play with the timing. Obviously I had the same lack of inter-cooling during static and taxi tests and my engine would get hot. The biggest difference between our engines is the seals themselves - mine are the 3mm 'indestructible' type. Regards John On 1/14/2011 8:19 AM, Chris Barber wrote: > > I am premixing. > > Also, I am only using three lbs of boost. I was under the impression > that this low of boost should not be a problem. I know there are many > other possible causes and will be investigating. > > I may start by putting in a lower boost spring in the waste gate (1.5 > lbs) but I am not really thinking this is the issue. Perhaps timing, > as I did play with it quite a bit before I sent my EC2 to Tracy for a > check and update. My higher power tests were quite short as the > engine would get hot fast but never to any degree that I would have > thought would be a problem. > > I have an intercooler, however, without any airflow its usefulness > during testing is next to nothing. Also, the intercooler ducting is > somewhat minimum at this point. > > I thought I would recognize detonation, as Lynn mentioned, but perhaps > not. > > I also read on the RX-7 site that the rear chamber is the one to > usually fail, as mine seems to bare out. > > Christopher Barber, JD. > Corporal; Patrol Division > Master Peace Officer > Badge 330 > Bellaire Police Department > 5100 Jessamine > Bellaire, Texas 77401 > 713-668-0487 > CBarber@BellariePolice.com > ------------------------------------------------------------------------ > *From:* Rotary motors in aircraft [flyrotary@lancaironline.net] on > behalf of Mark Steitle [msteitle@gmail.com] > *Sent:* Friday, January 14, 2011 05:52 > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: Apex seal update cont with pix of rotor > andapex seals > > My first impression is they got overheated. Each apex appears very > dark, possibly due to heat. Are you pre-mixing or using the injection > pump. > > Mark > > On Thu, Jan 13, 2011 at 8:52 PM, Chris Barber > > wrote: > > ...and finally, for now. > > Thanks folks > > Chris > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > > Warning: This e-mail transmission, and any documents, files or > previous e-mails attached to it, may contain confidential information > that is legally privileged. If you are not the intended recipient or > the person responsible for delivering it to the intended recipient, > you are hereby notified that any disclosure, copying, distribution or > use of any of the information contained in or attached to this > transmission is STRICTLY PROHIBITED. If you have received this > transmission in error, please immediately notify us by telephone at > 713-662-8132 and destroy the original transmission and its attachments > without reading them. Thank you. > --------------090504080208040403080906 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit This doesn't make sense, Chris. In the early days with the fixed pitch prop I could HEAR detonation starting during the runup. I throttled back a bit and it went away. My seals were undamaged. I boost 5 - 7 lbs. (44map). The one thing that jumped out from your list that I never did was play with the timing. Obviously I had the same lack of inter-cooling during static and taxi tests and my engine would get hot. The biggest difference between our engines is the seals themselves - mine are the 3mm 'indestructible' type.
Regards
John


On 1/14/2011 8:19 AM, Chris Barber wrote:

I am premixing.

 

Also, I am only using three lbs of boost.  I was under the impression that this low of boost should not be a problem.  I know there are many other possible causes and will be investigating. 

 

I may start by putting in a lower boost spring in the waste gate (1.5 lbs) but I am not really thinking this is the issue.  Perhaps timing, as I did play with it quite a bit before I sent my EC2 to Tracy for a check and update.  My higher power tests were quite short as the engine would get hot fast but never to any degree that I would have thought would be a problem.

 

I have an intercooler, however, without any airflow its usefulness during testing is next to nothing. Also, the intercooler ducting is somewhat minimum at this point.

 

I thought I would recognize detonation, as Lynn mentioned, but perhaps not.

 

I also read on the RX-7 site that the rear chamber is the one to usually fail, as mine seems to bare out.

 

Christopher Barber, JD.
Corporal; Patrol Division
Master Peace Officer
Badge 330
Bellaire Police Department
5100 Jessamine
Bellaire, Texas 77401
 
713-668-0487
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Mark Steitle [msteitle@gmail.com]
Sent: Friday, January 14, 2011 05:52
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Apex seal update cont with pix of rotor andapex seals

My first impression is they got overheated.  Each apex appears very dark, possibly due to heat.  Are you pre-mixing or using the injection pump.  

Mark

On Thu, Jan 13, 2011 at 8:52 PM, Chris Barber <cbarber@texasattorney.net> wrote:

...and finally, for now.

 

Thanks folks

 

Chris


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Warning: This e-mail transmission, and any documents, files or previous e-mails attached to it, may contain confidential information that is legally privileged. If you are not the intended recipient or the person responsible for delivering it to the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of any of the information contained in or attached to this transmission is STRICTLY PROHIBITED. If you have received this transmission in error, please immediately notify us by telephone at 713-662-8132 and destroy the original transmission and its attachments without reading them. Thank you.


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