Lectron carbs

    > No the 4 cycle style lectron would work fine for our applications. I
    > just want everyone to know what we are talking about. You could use
   the
    > controlled pressure in the float bowl for leaning as Gordon
   mentioned. > I
    > would appoach the leaning system carefully so you wouldn't eend up
    > flipping to severe lean conditions and siezing the engine.
    > Bill Jepson

   ***** Hi Bill,
   any thoughts on the Lectron plastic float bowl sitting over the hot
   exhaust; I think I prefer a metal float bowl.

   Also, it occurred to me that we could replace the float bowl with a
   metering block similar to the Revmaster or the Ellison, thereby making
   the carb into a simple low pressure fuel injection system and adjust
   fuel delivery at the inlet, or as Paul suggested, with an adjustable
   fuel pressure valve.
   (The biggest throat Revmaster make is 40mm and the Ellison is very
   expensive as we need two for Pport tubes)
   BR, Dave McC

   Dave,
   The plastic float bowl isn't really a problem. By the time you might
   have a problem, you would be boiling the fuel in the bowl. This
   would stop you anyway. If you use carbs at all you better protect
   them with a good heat shield. I'd be most worried after stopping
   when the heat soak from the exhaust might cause problems.
   You MUST shield well or you'll have problems.
   Bill Jepson

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Boiling fuel isn't directly disasterous - maybe it depends on quantity.
Air cooled FI engines routinely heat the fuel in the injector plumbing
enough to get bubbles (and probably boil) - after shutdown. It's
annoying - makes hot starts difficult. From a little net searching,
100LL boils around 275 at standard pressure - lower at altitude.
Melting the float bowl might be disasterous though.

Beyond just heat shielding.. Need airflow to be properly managed.
Shielding AND venting. Louvers on top of the cowl?

It used to be common on inline car engines for carbs to be mounted above
the exhaust manifold. The intake and exhaust manifolds were often on
the same side of the engine.

Regards,

Matt-

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.