Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 452728 for flyrotary@lancaironline.net; Mon, 04 Oct 2004 21:05:01 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i9514RZg017612 for ; Mon, 4 Oct 2004 21:04:29 -0400 (EDT) Message-ID: <002601c4a9b6$8b236070$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Low power 20B operation Date: Sun, 3 Oct 2004 22:04:55 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0023_01C4A995.03D3CD10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0023_01C4A995.03D3CD10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI could be wrong, but I sort of doubt its an apex seal, John. The reason is a bad apex seal will generally make starting very = difficult (two chambers down on compression), but once started an engine = with a bad apex seal will generally produce power (just not as much as = with good seals) enough to get you up into the 4000-5000 rpm. Generally = just a normal compression gauge will tell you whether you have a bad = apex seal as you will get one face with good compression and two with = low compression. But, of course, a professional Mazda compression test = is the ultimate. You generally will also find a bit of vibration when an apex seal goes = as the power pulses are no longer in balance. It sounds to me like your are not getting enough fuel if you can not = make enough power to get beyond 2300 rpm. Even if you were not staging = and getting all four injectors, two should easily get you up into the = 4000-5000 rpm range. I presume the throttle body is opened fully when = you are at 2300 rpm - no slipping throttle cables? No pinched fuel = hoses? No collapsed air filters/hoses? Ed Anderson =20 ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, October 04, 2004 8:45 PM Subject: [FlyRotary] Re: Low power 20B operation After fixing the injector switches, EC2, PCM and triple checking all = the ignition and injector circuits I STILL have an engine that runs like = sh.t. 2300 rpm full throttle. I'm beginning to suspect an internal = problem like an apex seal or O rings. Tomorrow I'm having a professional = mazda compression test done. =20 Is it running incredibly rough? It's semi-likely that you could have = a stuck apex seal as long as the engine has sat around. I think Ed is = our resident expert on trying to free those. Even an unprofessional = compression test would tell the tale. =20 John (Please tell me it's not a blown engine)=20 Your neighbors must get tired of that black cloud over your house all = the time. I'm starting to think you and Al need to take a trip to New = Orleans and have a consult with one of the voodoo folks :-) Seriously, I'm sorry to hear of your continued problems. I can only = imagine how frustrating it must be. Hang in there. Rusty (feeling better about my engine with every message I read)=20 ------=_NextPart_000_0023_01C4A995.03D3CD10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I could be wrong, but I sort of doubt = its an apex=20 seal, John.
 
The reason is a bad apex seal will =  generally make starting very difficult (two chambers down on = compression),=20 but once started an engine with a bad apex seal will generally produce = power=20 (just not as much as with good seals) enough to get you up into the = 4000-5000=20 rpm.  Generally just a normal compression gauge will tell you = whether you=20 have a bad apex seal as you will get one face with good compression and = two with=20 low compression.  But, of course, a professional Mazda compression = test is=20 the ultimate.
 
You generally will also find a bit of=20 vibration  when an apex seal goes as the power pulses are no longer = in=20 balance.
 
It sounds to me like your are not = getting enough=20 fuel if you can not make enough power to get beyond 2300 rpm. Even = if you=20 were not staging and getting all four injectors, two should easily get = you up=20 into the 4000-5000 rpm range.  I presume the throttle body is = opened fully=20 when you are at 2300 rpm - no slipping throttle cables?  No pinched = fuel=20 hoses?  No collapsed air filters/hoses?
 
Ed Anderson
 
 
 
 
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, October 04, 2004 = 8:45=20 PM
Subject: [FlyRotary] Re: Low = power 20B=20 operation

After fixing the injector switches, EC2, = PCM and=20 triple checking all the ignition and injector circuits I STILL have an = engine=20 that runs like sh.t. 2300 rpm full throttle. I'm beginning to suspect = an=20 internal problem like an apex seal or O rings. Tomorrow I'm having a=20 professional mazda compression test done.  
 
Is it running incredibly rough?  It's = semi-likely=20 that you could have a stuck apex seal as long as the engine has sat=20 around.  I think Ed is our resident expert on trying to free = those. =20 Even an unprofessional compression test would tell the = tale. =20  
 
John (Please tell me it's not a blown = engine) 
 
Your neighbors must get tired of that black = cloud over=20 your house all the time.  I'm starting to think you and Al need=20 to take a trip to New Orleans and have a consult with one of = the=20 voodoo folks :-)
 
Seriously, I'm sorry to hear of your = continued=20 problems.  I can only imagine how frustrating it must = be. =20 Hang in there.
 
Rusty (feeling better about my engine with = every=20 message I read) 
 
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