X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail02.syd.optusnet.com.au ([211.29.132.183] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTPS id 2190436 for flyrotary@lancaironline.net; Fri, 20 Jul 2007 22:07:14 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.183; envelope-from=lendich@optusnet.com.au Received: from george (d58-104-174-232.dsl.nsw.optusnet.com.au [58.104.174.232]) by mail02.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l6L26Vnf032004 for ; Sat, 21 Jul 2007 12:06:32 +1000 Message-ID: <002b01c7cb3b$c51fe7e0$e8ae683a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] carbs vs efi Date: Sat, 21 Jul 2007 12:06:33 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01C7CB8F.94862690" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0025_01C7CB8F.94862690 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have been surprised at the recent flurry of carb postings. I = assumed that everyone was doing EFI. having experienced total = electrical failure in march on a trip to the Bahamas I was thinking a = lot about that Neanderthal carb bolted under my O320 and the magnetos, = all unaware of what was going on in the radio, GPS, and nav lights = departments. the reality is that you don't want a reserve battery to = get you to the ground safely, you want to get to the Bahamas and back = and THEN look into what's wrong. my questions are "how much power/performance is lost with a carb, and = which carbs can do manual mixture?". is it stupid to ask if the = Lycoming carb could run a 13B? someone mentioned Harley carbs having a = good history of rough service. what about marvel/schebler? is this = question heresy? :-) isn't efi a bit of overkill for an engine that = basically runs at 100% power, 75% power and idle? scanning thru the = archives I see a lot of postings regarding mixture, mapping, abrupt = failures and such. does this complexity buy us 5%, 20%? the question = of turbo-charging seems to beg similar line of questioning. kevin Kevin, It's probably my fault, with a number of chaps helping me out with = information. My Buddy Bill Jepson will tell you nothing beats EFI and when it's = running well, he's absolutely right! Not only that it is the best for fuel efficiency, leaning reading = fuel flow etc. etc. However I'm developing a single rotor and looking at all sorts of = issues including cost effectiveness of less elaborate installations. I'm = also not keen on high pressure fuel under the cowl. Most importantly I'm not an electronics person and seeing the problems = experienced by others has me more than a little nervous, in regard to = EFI. Of course I know very little about carbies, so their helping me with = this as well. The Revmaster might be the choice for me, but I'm awaiting the sticker = shock! George ( down under) ------=_NextPart_000_0025_01C7CB8F.94862690 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
I have been surprised at the recent = flurry of=20 carb postings.  I assumed that everyone was doing EFI.  = having=20 experienced total electrical failure in march on a trip to the Bahamas = I was=20 thinking a lot about that Neanderthal carb bolted under my O320 and = the=20 magnetos, all unaware of what was going on in the radio, GPS, and = nav=20 lights departments.    the reality is that you don't = want a=20 reserve battery to get you to the ground safely, you want to get to = the=20 Bahamas and back and THEN look into what's wrong.
my questions are "how much = power/performance=20 is lost with a carb, and which carbs can do manual mixture?".  is = it=20 stupid to ask if the Lycoming carb could run a 13B?  someone = mentioned=20 Harley carbs having a good history of rough service.  = what=20 about marvel/schebler?  is this question heresy? :-)  isn't = efi a=20 bit of overkill for an engine that basically runs at 100% power, 75% = power and=20 idle?  scanning thru the archives I see a lot of postings = regarding=20 mixture, mapping, abrupt failures and such.  does this complexity = buy us=20 5%, 20%?  the question of turbo-charging seems to beg = similar line=20 of questioning.    kevin
 
Kevin,
It's probably my fault, with a = number of chaps=20 helping me out with information.
My Buddy Bill Jepson will tell you = nothing=20 beats EFI and when it's running well, he's absolutely = right!
Not only that it is the best = for  fuel=20 efficiency, leaning reading fuel flow etc. etc.
However I'm developing a single = rotor and=20 looking at all sorts of issues including cost effectiveness of less = elaborate=20 installations. I'm also not keen on high pressure
fuel under the cowl.
Most importantly I'm not an = electronics=20 person and seeing the problems experienced by others has me more than = a little=20 nervous, in regard to EFI.
Of course I know very little about = carbies, so=20 their helping me with this as well.
The Revmaster might be the choice = for me, but=20 I'm awaiting the sticker shock!
George ( down=20 under)
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