X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail15.syd.optusnet.com.au ([211.29.132.196] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTPS id 2191766 for flyrotary@lancaironline.net; Sat, 21 Jul 2007 17:57:37 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.196; envelope-from=lendich@optusnet.com.au Received: from george (d58-109-55-132.dsl.nsw.optusnet.com.au [58.109.55.132]) by mail15.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l6LLuqW2011523 for ; Sun, 22 Jul 2007 07:56:54 +1000 Message-ID: <001001c7cbe2$0ffdb0c0$84376d3a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: carbs vs efi Date: Sun, 22 Jul 2007 07:56:57 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C7CC35.E0B1CC30" 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_000D_01C7CC35.E0B1CC30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jerry, Looks like Pat was wrong about Revmaster having a 44mm, the biggest they = go to is 42mm ( at the present time) and that costs $380. If I remember = the 32mm costs $320. Jerry I would be interested in feed back on what you thought about the = Aero Carb, especially how it's constructed - their all a little = different. I do like the Ellison but it's too bloody expensive. George ( down under) George, the web site says $326.00. You might want to compare the = aero carb which is similar. http://www.aeroconversions.com I will be looking at both at Oshkosh on Tuesday and Wednesday next = week. Jerry Jerry On Jul 20, 2007, at 10:06 PM, George Lendich wrote: 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_000D_01C7CC35.E0B1CC30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jerry,
Looks like Pat was wrong about = Revmaster having a=20 44mm, the biggest they go to is 42mm ( at the present time) and = that costs=20 $380. If I remember the 32mm costs $320.
Jerry I would be interested in feed = back on what=20 you thought about the Aero Carb, especially how it's constructed - their = all a=20 little different.
I do like the Ellison but it's too = bloody=20 expensive.
George ( down under)
George, =20 the web site says $326.00.  You might want to compare the aero = carb which=20 is similar.  http://www.aeroconversions.com
I will be looking at both at Oshkosh on Tuesday and Wednesday = next=20 week.  Jerry


Jerry






On Jul 20, 2007, at 10:06 PM, George Lendich wrote:
 
I have been surprised at the = recent=20 flurry of carb postings.  I assumed that everyone was doing=20 EFI.  having experienced total electrical failure in march on = a trip=20 to the Bahamas I was thinking a lot about that Neanderthal carb = bolted=20 under my O320 and the magnetos, all unaware of what was going on = in the=20 radio, GPS, and nav lights departments.    the = reality=20 is that you don't want a reserve battery to get you to the ground = safely,=20 you want to get to the Bahamas and back and THEN look into what's=20 wrong.
my questions are "how much=20 power/performance is lost with a carb, and which carbs can do = manual=20 mixture?".  is it stupid to ask if the Lycoming carb could = run a=20 13B?  someone mentioned Harley carbs having a good = history=20 of rough service.  what about marvel/schebler?  is this = question=20 heresy? :-)  isn't efi a bit of overkill for an engine that = basically=20 runs at 100% power, 75% power and idle?  scanning thru the = archives I=20 see a lot of postings regarding mixture, mapping, abrupt failures = and=20 such.  does this complexity buy us 5%, 20%?  the = question of=20 turbo-charging seems to beg similar line of=20 questioning.    kevin
 
Kevin,
It's probably my fault, with = a number=20 of chaps helping me out with information.
My Buddy Bill Jepson will = tell you=20 nothing beats EFI and when it's running well, he's absolutely=20 right!
Not only that it is the best = for =20 fuel efficiency, leaning reading fuel flow etc. = etc.
However I'm developing a = single rotor=20 and looking at all sorts of issues including cost effectiveness of = less=20 elaborate installations. I'm also not keen on high=20 pressure
fuel under the=20 cowl.
Most importantly I'm = not an=20 electronics person and seeing the problems experienced by others = has me=20 more than a little nervous, in regard to EFI.
Of course I know very little = about=20 carbies, so their helping me with this as = well.
The Revmaster might be the = choice for=20 me, but I'm awaiting the sticker shock!
George ( down=20 under)

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