X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.12.137.3] (HELO imo-m22.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3042036 for flyrotary@lancaironline.net; Fri, 25 Jul 2008 12:39:45 -0400 Received: from WRJJRS@aol.com by imo-m22.mx.aol.com (mail_out_v38_r9.4.) id q.c41.3d22e6a6 (37554) for ; Fri, 25 Jul 2008 12:39:42 -0400 (EDT) Received: from smtprly-ma02.mx.aol.com (smtprly-ma02.mx.aol.com [64.12.207.141]) by cia-mb03.mx.aol.com (v121.5) with ESMTP id MAILCIAMB033-92b2488a01ce37b; Fri, 25 Jul 2008 12:39:42 -0400 Received: from webmail-nd10 (webmail-nd10.sim.aol.com [207.200.67.95]) by smtprly-ma02.mx.aol.com (v121_r2.10) with ESMTP id MAILSMTPRLYMA027-5c51488a01c5255; Fri, 25 Jul 2008 12:39:34 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: 13B--- N/A vs. Turbo engine buildup? Date: Fri, 25 Jul 2008 12:39:34 -0400 X-AOL-IP: 66.253.96.220 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CABC8C279EE990_5F4_6BFC_webmail-nd10.sysops.aol.com" X-Mailer: AOL Webmail 37955-STANDARD Received: from 66.253.96.220 by webmail-nd10.sysops.aol.com (207.200.67.95) with HTTP (WebMailUI); Fri, 25 Jul 2008 12:39:34 -0400 Message-Id: <8CABC8C274B7670-5F4-3547@webmail-nd10.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CABC8C279EE990_5F4_6BFC_webmail-nd10.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Yvon, When an engine "is a dog" it means doesn't run well or has poor output for i= t's configuration. Fairly old slang. Bill Jepson -----Original Message----- From: Yvon Cournoyer To: Rotary motors in aircraft Sent: Fri, 25 Jul 2008 9:18 am Subject: [FlyRotary] Re: 13B--- N/A vs. Turbo engine buildup? ''it is a dog'' What does that expression mean? YvonC ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Thursday, July 24, 2008 8:18 PM Subject: [FlyRotary] Re: 13B--- N/A vs. Turbo engine buildup? Paul,=20 I am running a N/A 20B-REW (twin turbo) rotary in my Lancair.=C2=A0 It has t= he stock 9.0 rotors.=C2=A0 I've read over and over that at the rpm range we=20= operate, there is very little difference in power between low and high compr= ession rotors.=C2=A0 I doubt that anyone that's ridden in my Lancair would s= ay that it is a "dog".=C2=A0 However, I did do a little porting, so probably= helps to offset the low compression rotors.=C2=A0 You can use high compress= ion rotors, but you'll need to have it rebalanced.=C2=A0 I used the stock tu= rbo rotors because I may want to turbo-charge later on and didn't want to te= ar the engine down again to change rotors.=C2=A0=20 Mark=20 On Thu, Jul 24, 2008 at 5:20 PM, Paul Vermillion wrote: =C2=A0 =C2=A0 Subject: 13B--- N/A vs. Turbo engine buildup? =C2=A0 To Everyone=E2=80=94 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 We have both a 13b =C2=A0NA (unknown vintage=E2=80=9480's?) and= a '91 Turbo 13B engine and are just beginning their teardowns, both alleged= ly running but internal condition unknown.=C2=A0=C2=A0 Would there be any pr= oblem running the Turbo engine (BUT NOT with the turbo setup-- AS IF it were= a NA engine)?=C2=A0 Is it a "stronger" engine than the NA? =C2=A0Would it n= eed a different Timing setup?=C2=A0 Would there be a compression problem run= ning it sans turbo? (Hearsay has it that it would be a "dog".)=C2=A0 If some= of the individual parts spec out to be better in one engine but not in the=20= other, would there be any problem/advantage in "mixing & matching" the vario= us parts in the newly built up engine, i.e., rotaries, side plates, eccentri= c shaft, etc?=C2=A0=C2=A0 We would appreciate your inputs.=C2=A0 =C2=A0=C2= =A0Thanks! =C2=A0 Paul & Don Vermillion ----------MB_8CABC8C279EE990_5F4_6BFC_webmail-nd10.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" Yvon,
When an engine "is a dog" it means doesn't run well or has poor output for i= t's configuration. Fairly old slang.
Bill Jepson


-----Original Message-----
From: Yvon Cournoyer <geryvon@videotron.ca>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, 25 Jul 2008 9:18 am
Subject: [FlyRotary] Re: 13B--- N/A vs. Turbo engine buildup?

''it is a dog'' What does that expr= ession mean? YvonC
----- Original Message -----
Sent: Thursday, July 24, 2008 8:18 PM=
Subject: [FlyRotary] Re: 13B--- N/A v= s. Turbo engine buildup?

Paul,

I am running a N/A 20B-REW (twin turbo) rotary in my Lancair.  It has t= he stock 9.0 rotors.  I've read over and over that at the rpm range we=20= operate, there is very little difference in power between low and high=20 compression rotors.  I doubt that anyone that's ridden in my Lancair wo= uld say that it is a "dog".  However, I did do a little porting, so pro= bably helps to offset the low compression rotors.  You can use high com= pression rotors, but you'll need to have it rebalanced.  I used the sto= ck turbo rotors because I may want to turbo-charge later on and didn't want=20= to tear the engine down again to change rotors. 

Mark

On Thu, Jul 24, 2008 at 5:20 PM, Paul Vermillion &l= t;paulo264@cox.net> wrote:
 
 

Subject: 13B--- N/A vs. Turbo engine buildup?
 
To Everyone=E2=80=94
            = ;    We have both a 13b  NA (unknown vintage=E2= =80=9480's?) and a '91 Turbo 13B engine and are just beginning their teardow= ns, both allegedl y running but internal condition unknown.   Would there be any pro= blem running the Turbo engine (BUT NOT with the turbo setup-- AS I= F it were a NA engine)?  Is it a "stronger" engine than the NA? &nb= sp;Would it need a different Timing setup?  Would there be a compressio= n problem running it sans turbo? (Hearsay has it that it would be a "dog".)&= nbsp; If some of the individual parts spec out to be better in one engine bu= t not in the other, would there be any problem/advantage in "mixing & ma= tching" the various parts in the newly built up engine, i.e., rotaries, side= plates, eccentric shaft, etc?   We would appreciate your inputs.&= nbsp;   Thanks!
 
Paul & Don Vermillion

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