X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from omr-m07.mx.aol.com ([64.12.143.81] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6363784 for flyrotary@lancaironline.net; Sun, 07 Jul 2013 17:18:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.143.81; envelope-from=shipchief@aol.com Received: from mtaout-da02.r1000.mx.aol.com (mtaout-da02.r1000.mx.aol.com [172.29.51.130]) by omr-m07.mx.aol.com (Outbound Mail Relay) with ESMTP id 8EF68700000B0 for ; Sun, 7 Jul 2013 17:18:05 -0400 (EDT) Received: from [10.241.65.66] (73.sub-174-253-192.myvzw.com [174.253.192.73]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mtaout-da02.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id 437FFE00008E for ; Sun, 7 Jul 2013 17:18:04 -0400 (EDT) Subject: Re: [FlyRotary] Re: Turbo boost indication References: From: Scott Emery Content-Type: multipart/alternative; boundary=Apple-Mail-1--212308721 X-Mailer: iPhone Mail (8E600) In-Reply-To: Message-Id: <944449D3-E27A-444C-AF88-7CEF23BBB330@aol.com> Date: Sun, 7 Jul 2013 14:17:58 -0700 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPhone Mail 8E600) x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1373231885; bh=kg7Ju7kK2qmQCUqawrt0SVqRdTbdroYX1kvTU2qTaIU=; h=From:To:Subject:Message-Id:Date:Mime-Version:Content-Type; b=Bir88das9VzsNJxgCmInhsrKPZBvUKjsDX2+4IMXHrzwUFEDeQnWC3C4yZH+AmJDU XdFXLDx5QkIhoduV9mb+DFzkUrjHN04pLxamwJIb/omk5KdalKb3rjmGizGDkb3MbP wteKQAy+CqMTRbDL5hgo8u/XI7S22sj+kJkhQ3PE= X-AOL-SCOLL-SCORE: 0:2:375316928:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d338251d9db0a1332 X-AOL-IP: 174.253.192.73 --Apple-Mail-1--212308721 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii I'm thinking my "Blown Engine" experience might be avoidable in the future i= f I add a large manifold pressure gauge in plain sight, install a 1.30 A/R e= xhaust housing, retard the timing, run 100 LL blue gas, and add an intercool= er.=20 In that order. I got an engine hoist yesterday so now I can put the repaired engine back on= . Getting it off didn't require as much precision... After I get some experience, I'll try different grades of mogas @ defined ma= nifold pressure limits. Sent from my iPhone On Jul 6, 2013, at 12:36 PM, David Leonard wrote: > OK, so the more accurate conversion is=20 > 20psi=3D40.7 in Hg > so in your example > 20psi boost =3D 70.6 in MAP (Manifold Absolute Pressure) >=20 > It help in your article, turbos work as a boost ratio. So this turbo it t= hen making a boost ratio of: > 70.6 / 29.9 =3D 2.36 >=20 > So as you go up in altitude you multiply the ambient pressure by 2.36 >=20 > So at 17,500 ft the pressure is half, and so is the MAP, or, 35.3 " MAP >=20 > Losses are not porportunately reduced, and the turbo may be less efficient= in that range so actual MAP may be less. >=20 >=20 >=20 >=20 > On Sat, Jul 6, 2013 at 11:57 AM, Patrick Panzera wrote: > I'm editing an article about a bone stock, turbocharged direct injection c= ar engine that boasts 20 lbs of boost.=20 >=20 > I want to convert that to MP so us airplane junkies can wrap our heads aro= und it. >=20 > Thanks! >=20 > Pat=20 >=20 >=20 > On Sat, Jul 6, 2013 at 11:44 AM, David Leonard wrote= : > Simply convert 20 psi to Inches of Hg (its about 2 to 1 but not exactly) a= nd add it to 29.9. So the MP should be about 69 inches, give or take depend= ing on losses and where in the system you measure. >=20 > I keep my plane less that 45 inches MP. You have to be more rich and skil= led than me to go higher without detonation. >=20 >=20 > On Sat, Jul 6, 2013 at 11:14 AM, Patrick Panzera wrote: > Friends, >=20 > Hypothetical question.=20 > Let's say it's a standard day and I'm at sea level. > I've installed a turbocharger and have also connected the stock automobile= turbo boost gauge, along with my traditional manifold pressure gauge. >=20 > I ground-run the engine to full throttle (where the MP would normally be r= eading 29.92- minus some efficiency loss) and the boost gauge is reading 20 p= si. >=20 > What should the MP indicator be reading? >=20 > Thanks! >=20 > Pat >=20 >=20 >=20 >=20 > --=20 > David Leonard >=20 > Turbo Rotary RV-6 N4VY > http://N4VY.RotaryRoster.net > http://RotaryRoster.net >=20 >=20 >=20 >=20 > --=20 > David Leonard >=20 > Turbo Rotary RV-6 N4VY > http://N4VY.RotaryRoster.net > http://RotaryRoster.net --Apple-Mail-1--212308721 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
I'm thinking my "Blown Engine" experien= ce might be avoidable in the future if I add a large manifold pressure gauge= in plain sight, install a 1.30 A/R exhaust housing, retard the timing, run 1= 00 LL blue gas, and add an intercooler. 
In that order.
=
I got an engine hoist yesterday so now I can put the repaired engine ba= ck on. Getting it off didn't require as much precision...
After I g= et some experience, I'll try different grades of mogas @ defined manifold pr= essure limits.

Sent from my iPhone

On Jul 6, 2013, at 1= 2:36 PM, David Leonard <wdleonard@= gmail.com> wrote:

<= div>
OK, so the more accurate conversion is 
20psi=3D= 40.7 in Hg
so in your example
20psi boost =3D 70.6 in MA= P (Manifold Absolute Pressure)

It help in your arti= cle, turbos work as a boost ratio.  So this turbo it then making a boos= t ratio of:
70.6 / 29.9  =3D 2.36

So as you go up in a= ltitude you multiply the ambient pressure by 2.36

S= o at 17,500 ft the pressure is half, and so is the MAP, or, 35.3 " MAP
=

Losses are not porportunately reduced, and the turbo may= be less efficient in that range so actual MAP may be less.




On Sat, Jul 6, 2013 at 11:57 AM, Patrick Panzera <editor@contactmagazine.com> w= rote:
I'm editing an article about a bone stock, turbocharged dir= ect injection car engine that boasts 20 lbs of boost.

I want to= convert that to MP so us airplane junkies can wrap our heads around it.

Thanks!

Pat 


On Sat, Jul 6, 2013 at 11:44 AM, David Leonard <wdleonard@gmail.com> w= rote:
Simply convert 20 psi to Inch= es of Hg (its about 2 to 1 but not exactly) and add it to 29.9.  So the= MP should be about 69 inches, give or take depending on losses and where in= the system you measure.

I keep my plane less that 45 inches MP.  You have to be more= rich and skilled than me to go higher without detonation.


On Sat, Jul 6, 2013 a= t 11:14 AM, Patrick Panzera <editor@contactmagazine.com> wrote:
Friends,

Hypothe= tical question. 
Let's say it's a standard day and I'm at sea= level.
I've installed a turbocharger and have also connected the stock automob= ile turbo boost gauge, along with my traditional manifold pressure gauge.

I ground-run the engine to full throttle (where the MP w= ould normally be reading 29.92- minus some efficiency loss) and the boost ga= uge is reading 20 psi.

What should the MP indicator= be reading?

Thanks!

Pat




--
David Leonard

Turbo Rotary RV-6 N4VYhttp://N4VY.RotaryRoster.net
http://RotaryRoster.net




--
D= avid Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster= .net
http://RotaryRoster.net = --Apple-Mail-1--212308721--