CorvAircraft> alternative carbs

[Gary&Sharon]

Clare,
Thanks for your imput,  I am curious what you meant by "OVERKILL for our 
use"  to large?  to complex?

Mark,
   Thanks for your imput,  The one I have is an overhauled  DHLA.   I hate 
to admit it, but my primary reason for wanting to use it is that I have it, 
and its paid for.   I wish I could say I want the sophication, but the truth 
is, at my age, being retired, having started a homebuilt twice before, and 
having to sell it when life got in the way,  I just want to get a safe 
flying project in the air.  If its low and slow, so be it.
   Your comment about leaning a carb by introducing a manifold leak is 
simple and brillant.  I never thought of that.  I bet if you came up with a 
semi-universal apparatus to do that, you would have a ready market, as a lot 
of people want to use carbs that are otherwise  useful but lack mixture 
adjustment.
  If anyone out there reading this wants one of these and has something I 
can use, I would be willing to consider some kind of trade.  I still need a 
LH prop and some kind of  intake system.
thanks again and have a great new year
Gary

----- Original Message ----- 
From: "Mark Langford" <n56ml at hiwaay.net>
To: "Jim Wickert" <jimw_btg at earthlink.net>; "Corvair engines for homebuilt 
aircraft" <corvaircraft at mylist.net>
Sent: Tuesday, January 01, 2008 7:00 AM
Subject: Re: CorvAircraft> alternative carbs


> Jim Wickert wrote:
>
>>>Mark Langford is probly onr of the most experienced with the Dellorto and
> the corvair for aircraft use.  He has comments in hiw web regarding his
> findings with the weber.  I can tell you if was simple to setup and use 
> Mark
> would have used the weber but he elected after some work not to use it.  I
> find the Dellorto and Weber type carb to be fickle when working at 
> changing
> altitudes.  <<
>
> I'm not sure I've ever actually seen a Dellorto in person, but I do know 
> my
> way around Webers.  I didn't fly my Weber 40DCOE because I was going to
> mount mine on top and couldn't figure out how to run carb heat to it 
> without
> a hideous cowling.  Aesthetics mean less to me now, and I think I could 
> make
> that work.  Altitude compensation is another matter, but there was some 
> hope
> that it work by  introducing an intake manifold leak that would allow
> leaning at altitude.
>
> Webers can be made to run very smoothly over a wide range of throttle
> settings, and under radically different operating conditions, which is not
> something the Ellison impresses me with.  Even sitting on the ground,
> changing the throttle setting requires resetting the mixture, although 
> maybe
> I'm just more sensitive to that than most people because I have a mixture
> gauge that tells me exactly where optimal air fuel ratio is.  My idea of
> "rough" is subjective too, as I have the smoothest running engine that 
> I've
> ever flown behind.  And one could always argue that it's not set up
> properly, but there's not much to set up on the thing, and even Ellison 
> just
> says "hmmmm" when I explain the lack of consistent air/fuel ratio 
> throughout
> the range.
>
> I do know that at cruise if I go full throttle I'll have to fiddle around
> with the mixture to keep it from running rough, and I don't think  a Weber
> would require that kind of constant attention.  I haven't flown one, but
> John Martindale has, and he'd be better prepared to answer those questions
> than I would.  I do feel pretty certain that a Weber would provide a more
> homogenous air/fuel charge to the six cylinders than the Ellison, despite 
> my
> convoluted intake system.  I've toyed with replacing the Ellison with the
> Weber, and next time I'm in the mood to modifiy the cowling, I may do that
> just to see how it does.  I think I already know the answer to that one
> though.  It's not that the Ellison doesn't work OK, it just doesn't work
> like I think any reasonably good carburetor should work.  But like I said,
> I'm probably using an automotive yardstick, rather than the airplane
> measure.  The Ellison does get the job done with zero maintenance problems
> so far, so perhaps I shouldn't complain...
>
> Mark Langford, Huntsville, Alabama
> see KR2S project N56ML at http://home.hiwaay.net/~langford
> email to N56ML "at" hiwaay.net
> --------------------------------------------------------------
>
>
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