Return-Path: Received: from mtiwmhc11.worldnet.att.net ([204.127.131.115] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 552674 for flyrotary@lancaironline.net; Wed, 01 Dec 2004 12:21:22 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.131.115; envelope-from=keltro@att.net Received: from 204.127.135.57 ([204.127.135.57]) by worldnet.att.net (mtiwmhc11) with SMTP id <2004120117205111100ijsqve>; Wed, 1 Dec 2004 17:20:51 +0000 Received: from [209.247.222.97] by 204.127.135.57; Wed, 01 Dec 2004 17:20:50 +0000 From: keltro@att.net (Kelly Troyer) To: flyrotary@lancaironline.net Subject: FW: Re: ad plenum and cowl design Date: Wed, 01 Dec 2004 17:20:50 +0000 Message-Id: <120120041720.27993.41ADFD71000728A400006D592160376316019D9B040A05@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 18 2004) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_27993_1101921650_0" --NextPart_Webmail_9m3u9jl4l_27993_1101921650_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit A little something from the other list !! -- Kelly Troyer Dyke Delta/13B/RD1C/EC2 -------------- Forwarded Message: -------------- From: keltro@att.net (Kelly Troyer) Subject: Re: ad plenum and cowl design Date: Wed, 1 Dec 2004 16:48:29 +0000 > > >> Paul, over the last year there were few people complained about > > >> dribbling injectors after shut down. I wander if it is healthy to have > > >> standing gasoline in the plenum, which can happen in the one you are > > >> showing? I'm thinking about the possibilities of a big BOOM! :) > > >> I made sure my injectors and runners face downhill towards the engine > > >> ports. On my engine also the original injectors were oriented to face > > >> downhill. What do you think? > > >> Bulent > > > > > How does it help to face them down hill? > > > > > > Paul Lamar > > Matt Prather wrote: > > > > I'd rather have the gas stay in the plenum than soak/clean > > the innards of the engine. If the fuel sits in the engine > > there's a better chance of corrosion in the places where > > the fuel washes the oil coating from the parts. > > > > In old CIS mechanical injection, leaking injectors were > > one form of failure - replace when you find that. I suspect > > modern injectors are the same. > > > > Regards, > > > > Matt- > Group, One way to address leaky injectors ( a common problem with high mileage RX7's ) is to put a bypass between the pressure side of the fuel pump to the fuel return line after the fuel regulator . A .020 +/- oriface will bleed off the fuel pressure (35-40 psi) after shutdown and prevent or severely reduce leakdown and potential flooded start and/or the possible washdown of lube from rotors and housings. As Mark Steitle has noted previously this fix also provides a way to purge the lines of air after running a fuel tank dry which causes a air lock in the fuel system . The fuel pump has plenty of excess capacity to compensate for the slight loss of pressure during normal operation. FWIW Kelly Troyer --NextPart_Webmail_9m3u9jl4l_27993_1101921650_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

A little something from the other list !!

--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2

-------------- Forwarded Message: --------------
From: keltro@att.net (Kelly Troyer)
Subject: Re: ad plenum and cowl design
Date: Wed, 1 Dec 2004 16:48:29 +0000

> > >> Paul, over the last year there were few people complained about
> > >> dribbling injectors after shut down. I wander if it is healthy to have
> > >> standing gasoline in the plenum, which can happen in the one you are
> > >> showing? I'm thinking about the possibilities of a big BOOM! :)
> > >> I made sure my injectors and runners face downhill towards the engine
> > >> ports. On my engine also the original injectors were oriented to face
> > >> downhill. What do you think?
> > >> Bulent
>
>
> > > How does it help to face them down hill?
> > >
> > > Paul Lamar
>
> Matt Prather wrote:
> >
> > I'd rather have the gas stay in the plenum than soak/clean
> > the innards of the engine. If the fuel sits in the engine
> > there's a better chance of corrosion in the places where
> > the fuel washes the oil coating from the parts.
> >
> > In old CIS mechanical injection, leaking injectors were
> > one form of failure - replace when you find that. I suspect
> > modern injectors are the same.
> >
> > Regards,
> >
> > Matt-
>
Group,

One way to address leaky injectors ( a common problem with high

mileage RX7's ) is to put a bypass between the pressure side of the fuel

pump to the fuel return line after the fuel regulator . A .020 +/- oriface will

bleed off the fuel pressure (35-40 psi) after shutdown and prevent or

severely reduce leakdown and potential flooded start and/or the possible

washdown of lube from rotors and housings. As Mark Steitle has noted

previously this fix also provides a way to purge the lines of air after

running a fuel tank dry which causes a air lock in the fuel system . The

fuel pump has plenty of excess capacity to compensate for the slight

loss of pressure during normal operation. FWIW

Kelly Troyer

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