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 452826 for flyrotary@lancaironline.net; Mon, 04 Oct 2004 23:11:58 -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 i953BOZg021623 for ; Mon, 4 Oct 2004 23:11:25 -0400 (EDT) Message-ID: <001101c4a9c8$47691980$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Low power 13B Operation Date: Mon, 4 Oct 2004 00:11:52 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C4A9A6.BFEE7E80" 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_000E_01C4A9A6.BFEE7E80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageJohn, I presume this is all with the turbocharger hooked up? = Getting 30/31 inches Hg at 2300 rpm indicates that the engine is not = sucking from the intake manifold as hard as it should be. If the = problem were an obstruction in the intake then I would expect the = manifold pressure to be lower due to the restriction hindering air from = flowing into the intake manifold. But, it sounds like your throttle is = wide open. Soooooo..... This leads me to wonder whether or not there could be a problem with the = exhaust side of the engine. If it were plugged or restricted due to a = collapsed muffler, turbo charger turbine not turning then that could = prevent it from going to higher rpm. If the case, then you would have a = high intake manifold pressure (since the throttle is wide open and the = engine is not sucking from the manifold as it should) and low power due = to the restriction in the exhaust. =20 I can remember when collapsed mufflers and cat converters (when they = first came out) could become plugged and give this type of results on = reciprocating engines So in lue of anything else I would check out the exhaust side of the = equation also. Ed Anderson ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Monday, October 04, 2004 10:29 PM Subject: [FlyRotary] Re: Low power 20B operation > I could be wrong, but I sort of doubt its an apex seal, John.=20 Please don't be wrong, Ed. > I presume the throttle body is opened fully when you are at 2300 rpm = - no slipping throttle cables? =20 > No pinched fuel hoses? No collapsed air filters/hoses?=20 I don't think so, but thanks for the list of things to check. My list = was empty. One symptom that caught my attention is the MAP reading. At full = throttle it bounces around 30/31. It goes down normally on throttle = reduction. It was always very steady (and went up and down with = throttle). Helpful clue??? > Is it running incredibly rough? =20 Not incredibly rough, no. Just VERY sluggish. John (what me? frustrated?) ------=_NextPart_000_000E_01C4A9A6.BFEE7E80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
John, I presume this is all with the = turbocharger=20 hooked up?  Getting 30/31 inches Hg at 2300 rpm indicates that the = engine=20 is not sucking from the intake manifold as hard as it should be.  = If the=20 problem were an obstruction in the intake then I would expect the = manifold=20 pressure to be lower due to the restriction hindering air from flowing = into the=20 intake manifold.  But, it sounds like your throttle is wide = open. =20 Soooooo.....
 
This leads me to wonder whether or not = there could=20 be a problem with the exhaust side of the engine.  If it were = plugged or=20 restricted due to a collapsed muffler, turbo charger turbine not = turning=20 then that could prevent it from going to higher rpm.  If the case, = then you=20 would have a high intake manifold pressure (since the throttle is wide = open and=20 the engine is not sucking from the manifold as it should) and low power = due to=20 the restriction in the exhaust. 
 
I can remember when collapsed mufflers = and cat=20 converters (when they first came out) could become plugged and give this = type of=20 results on reciprocating engines
 
 So in lue of anything else I = would check out=20 the exhaust side of the equation also.
 
Ed Anderson
----- Original Message -----
From:=20 John=20 Slade
Sent: Monday, October 04, 2004 = 10:29=20 PM
Subject: [FlyRotary] Re: Low = power 20B=20 operation

> I could be wrong, but I sort = of doubt=20 its an apex seal, John. 
Please don't be wrong, = Ed.
 
> I presume the throttle body is = opened=20 fully when you are at 2300 rpm - no slipping throttle = cables?   
> No=20 pinched fuel hoses?  No collapsed air filters/hoses? 
I don't think so, but thanks for the list = of things=20 to check. My list was empty.
One symptom that caught my attention is the = MAP=20 reading. At full throttle it bounces around 30/31. It goes down = normally=20 on throttle reduction. It was always very steady (and went up and = down=20 with throttle). Helpful clue???
 
> Is it running incredibly=20 rough?   
Not=20 incredibly rough, no. Just VERY=20 = sluggish.
&nbs= p;
John (what = me?=20 = frustrated?)
= ------=_NextPart_000_000E_01C4A9A6.BFEE7E80--