X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1922028 for flyrotary@lancaironline.net; Thu, 15 Mar 2007 01:55:28 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao104.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070315055438.GDOH1606.fed1rmmtao104.cox.net@fed1rmimpo02.cox.net> for ; Thu, 15 Mar 2007 01:54:38 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id atue1W00n1xAn3c0000000; Thu, 15 Mar 2007 01:54:39 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Speaking of Mistral....? Date: Wed, 14 Mar 2007 21:54:43 -0800 Message-ID: <000001c766c6$6deb1870$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C76683.5FC7D870" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C76683.5FC7D870 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Chris; =20 As mentioned, it is designed for the regulator plumbed in series with = the fuel rail, and the pinhole is for bleed-off of air in the rail. Some = sort of rail air bleed is needed for the case where the EFI pump is not in a = low point of the system such that any air on the inlet side would migrate = back to the tank so the pump would will always self prime. =20 Al =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Christopher Barber Sent: Wednesday, March 14, 2007 5:15 PM To: Rotary motors in aircraft Subject: [FlyRotary] Speaking of Mistral....? =20 I have the Mistral intake and am setting up my fuel lines. The lines go into the fuel rail through a big hole (3/8?), but exit through a very = tine "pin hole" on the other end. I am not versed in fuel injection as my history is with carbs in my ol' 65 Mustang ragtop. =20 During the first incarnation my build buddy David had a pressure = regulator installed before the fuel rail. Then, following some internet research = on fuel injection by me, I found several sources that stated the pressure regulator is usually installed downstream of the rail. David figured = this may make sense, but felt it should be T'ed back to the sump tank (sump = per Velocity plans). =20 =20 I looked at my friends RV-7 who is installing an Eggennfelder Subaru = which also has pin hole restrictor and tried to copy its pressure regulator = set up, however, Dave and my mechanical engineering hangar mate, Richard, do = not think it is proper. I too wondered what the pressure regulator was = actually doing since it is downstream of the pin hole which provides a lot of restriction and it was T'ed in a manner that went around the regulator = and since the fuel would go by the path of least resistance would in all likelihood bypass the fuel pressure regulator almost completely. =20 I had another engineering friend look at the set up (who btw has worked = with some of the Mistral folks as he is heavily involved in the aviation community...the company he owns provides aircraft A/C systems for = companies like Cirrus, Moony, Eclipse, Columbia and in the last couple of months = he has been in discussions with Cessna, Piper and Honda Jet.....pretty good credentials....and he is the builder of the RV-7 with the Eggenfeilder) = He believes that the Mistral Intake does not need the pressure regulator = since the pin hole is doing the job of keeping the rail "charged". =20 We have emailed the contacts at Mistral who have not as of yet responded....it has been a couple of weeks. I understand they cannot provide major tech support, but I would love some direction. We hope to = be great ambassadors for their product. I would assume some basic tech = info is available. =20 However, since I have yet to hear from Mistral, do any of y'all have any insight and/or solutions as to what would be "best" . =20 =20 Thanks, I am quite close to first start, but I obviously need to resolve this question. =20 All the best, =20 Chris Barber Houston, Texas =20 www.LoneStarVelocity.com ------=_NextPart_000_0001_01C76683.5FC7D870 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Chris;

 

As mentioned, it is designed for = the regulator plumbed in series with the fuel rail, and the pinhole is for = bleed-off of air in the rail.  Some sort of rail air bleed is needed for the = case where the EFI pump is not in a low point of the system such that any air = on the inlet side would migrate back to the tank so the pump would will always = self prime.

 

Al

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Christopher Barber
Sent: Wednesday, March = 14, 2007 5:15 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Speaking of Mistral....?

 

I have the = Mistral intake and am setting up my fuel lines.  The lines go into the fuel rail = through a big hole (3/8?), but exit through a very tine "pin hole" on = the other end.  I am not versed in fuel injection as my history is with = carbs in my ol' 65 Mustang ragtop.

 

During the first incarnation my build buddy David had a pressure regulator installed = before the fuel rail.  Then, following some internet research on fuel = injection by me, I found several sources that stated the pressure regulator is = usually installed downstream of the rail.  David figured this may make = sense, but felt it should be T'ed back to the sump tank (sump per Velocity = plans). 

 

I looked at my = friends RV-7 who is installing an Eggennfelder Subaru which also has  pin = hole restrictor and tried to copy its pressure regulator set up, = however, Dave and my mechanical engineering hangar mate, Richard, do not think it is proper.  I too wondered what the pressure regulator was actually = doing since it is downstream of the pin hole which provides a lot of = restriction and it was T'ed in a manner that went around the regulator and since the = fuel would go by the path of least resistance would in all likelihood bypass the = fuel pressure regulator almost completely.

 

I had another = engineering friend look at the set up (who btw has worked with some of the Mistral = folks as he is heavily involved in the aviation community...the company he owns = provides aircraft A/C systems for companies like Cirrus, Moony, Eclipse, Columbia = and in the last couple of months he has been in discussions with Cessna, Piper = and Honda Jet.....pretty good credentials....and he is the builder of the = RV-7 with the Eggenfeilder)  He believes that the Mistral Intake does not = need the pressure regulator since the pin hole is doing the job of keeping the = rail "charged".

 

We have emailed = the contacts at Mistral who have not as of yet responded....it has been a = couple of weeks.  I understand they cannot provide major tech support, but I = would love some direction.  We hope to be great ambassadors for their product.  I would assume some basic tech info is = available.

 

However, since I = have yet to hear from Mistral, do any of y'all have any insight and/or solutions = as to what would be "best" <g>. 

 

Thanks, I am = quite close to first start, but I obviously need to resolve this = question.

 

All the = best,

 

Chris = Barber

Houston, = Texas

 

------=_NextPart_000_0001_01C76683.5FC7D870--