X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail05.syd.optusnet.com.au ([211.29.132.186] verified) by logan.com (CommuniGate Pro SMTP 5.2.7) with ESMTPS id 3121768 for flyrotary@lancaironline.net; Tue, 09 Sep 2008 17:50:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.186; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-70-177.dsl.nsw.optusnet.com.au [211.31.70.177]) by mail05.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m89LnWBX013301 for ; Wed, 10 Sep 2008 07:49:33 +1000 Message-ID: <003901c912c5$f29cf640$6400a8c0@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: New rotary engine-mazda points on design Date: Wed, 10 Sep 2008 07:49:33 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C91319.C3BC56A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 X-Antivirus: avast! (VPS 080908-0, 08/09/2008), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0036_01C91319.C3BC56A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Good feed back Bill, George (down under) Hey Guys, There is nothing wrong with the Bing Carb. The one Jabaru uses is a = perfectly good carb, but tuning will effect any installation. Mikuni = makes a vacuum carb that looks so similar to the Bing you can't tell the = difference until you read the name on the side. Jabaru's intake system = does not look optimized for power. Not really bad, rather super = conservative and making carb placement easy. A carb of larger size or a = better manifold might certainly give better performance across the = board. Port electronic fuel injection would probably be better, but the = thing to remember that that system needs to be tuned as well. Bill Jepson -----Original Message----- From: George Lendich To: Rotary motors in aircraft Sent: Sat, 6 Sep 2008 6:45 pm Subject: [FlyRotary] Re: New rotary engine-mazda points on design That's good feed back Ben. I have myself suggested the Bing selection = is not such a good one. I believe that some use Mikuni carbs as a = replacement. I also notice with the Jabiru supplied Bing there is no = leaning knob, perhaps their afraid of losing valves. The Jabiru supplied = carb kit was running very rich mixtures and only recently have they = offered replacement (and leaner) jets as a modification. I've flown a 4 seat Jabiru and the six cylinder is very strong and = very good climb performance. However I agree with the advice and so glad = my opinion is supported. However some claim the benefit of altitude = compensation, but I believe that's only good up to certain heights. I have been lucky enough to have recently worked on a RV 7 with the = Bendix type ( constant feed) fuel injection system - only 30 psi. It = looks simple enough and runs of a mechanical pump - can be run off an = electric pump as well, so I'm told. Thanks again for the comment. George (down under) George, A friend of mine is flying his Kitfox with a Jabiru 2200. He had = some trouble with his carburetor leaking and took it to the FBO. The guy = looked at it and told him they used to run the Bing carburetor on = motorcyles years ago and now throw them in the scrap pile. I think the = Jab is a great engine, however, EFI would make it sing like your Suzuki. Ben ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Saturday, September 06, 2008 5:50 PM Subject: [FlyRotary] Re: New rotary engine-mazda points on design Tracy, I must be missing a point somewhere, or we have crossed wires, as I = haven't mentioned the combustion chamber. My only concern is high = pressure fuel leak in flight. Don't get me wrong I like fuel injection = because of the control over injection volume and performance. I only = wish there was high pressure at the point of injection - only.=20 I have fuel injection on my Suzuki 1800 Motorbike and it's great, = but I would hate to have to work on it, like I did on the old carbied = bike. I've noticed the Jabiru are running a very simple system. Their = using a Honda ignition module with an altitude compensating carby - not = that the system is perfect either. George ( down under) -------------------------------------------------------------------------= ----- Looking for spoilers and reviews on the new TV season? Get AOL's = ultimate guide to fall TV. ------=_NextPart_000_0036_01C91319.C3BC56A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Good feed back Bill,
George (down under)
Hey=20 Guys,
There is nothing wrong with the Bing Carb. The one Jabaru = uses is a=20 perfectly good carb, but tuning will effect any installation. Mikuni = makes a=20 vacuum carb that looks so similar to the Bing you can't tell the = difference=20 until you read the name on the side. Jabaru's intake system does not = look=20 optimized for power. Not really bad, rather super conservative and = making carb=20 placement easy. A carb of larger size or a better manifold might=20 certainly give better performance across the board. Port electronic = fuel=20 injection would probably be better, but the thing to remember that = that system=20 needs to be tuned as well.
Bill Jepson


-----Original=20 Message-----
From: George Lendich = <lendich@optusnet.com.au>
To:=20 Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: = Sat, 6=20 Sep 2008 6:45 pm
Subject: [FlyRotary] Re: New rotary engine-mazda = points on=20 design

 That's good feed back Ben. I = have myself=20 suggested the Bing selection is not such a good one. I = believe that=20 some use Mikuni carbs as a replacement. I also notice with the Jabiru = supplied=20 Bing there is no leaning knob, perhaps their afraid of losing valves. = The=20 Jabiru supplied carb kit was running very rich mixtures and only = recently have=20 they offered replacement (and leaner) jets as a = modification.
 
I've flown a 4 seat Jabiru and the = six cylinder=20 is very strong and very good climb performance. However I agree = with the=20 advice and so glad my opinion is supported. However some claim the = benefit of=20 altitude compensation, but I believe that's only good up to certain=20 heights.
 
I have been lucky enough to have = recently worked=20 on a RV 7 with the Bendix type ( constant feed) fuel injection system = - only=20 30 psi. It looks simple enough and runs of a mechanical pump - can be = run off=20 an electric pump as well, so I'm told.
 
Thanks again for the = comment.
George (down under)
George,
A friend = of mine is=20 flying his Kitfox with a Jabiru 2200. He had some trouble with his=20 carburetor leaking and took it to the FBO. The guy looked at it and = told him=20 they used to run the Bing carburetor on motorcyles years ago = and now=20 throw them in the scrap pile. I think the Jab is a great engine, = however,=20 EFI would make it sing like your Suzuki.
Ben
 
 
-----=20 Original Message -----
From:=20 George Lendich
Sent:=20 Saturday, September 06, 2008 5:50 PM
Subject:=20 [FlyRotary] Re: New rotary engine-mazda points on design

Tracy,
I must be missing a point somewhere, or we = have crossed=20 wires, as I haven't mentioned the combustion chamber. My only = concern is=20 high pressure fuel leak in flight. Don't get me wrong I like fuel = injection=20 because of the control over injection volume and performance. I only = wish=20 there was high pressure at the point of injection - only. =
 
I have fuel injection on my Suzuki 1800 = Motorbike and it's=20 great, but I would hate to have to work on it, like I did on the old = carbied=20 bike.
 
I've noticed the Jabiru are running a very = simple system.=20 Their using a Honda ignition module with an altitude compensating=20 carby - not that the system is perfect either.
George ( down = under)
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