For what you're looking for, go to:
http://www.calamander.co.uk/twinmax/twinmaxmk2.htm
which is a differential gauge that looks at both carbs simultaneously. Made
in France and a bit expensive. I've no idea how well it works.
Personally I've used a manometer that has a stainless steel rod in each arm,
instead of mercury. Much safer, but doesn't work as well, is sensitive to
dust making the rods stick slightly and needs to be held accurately upright.
Details at
http://www.carbtune.com/
But it was cheap!
Quirks of the engine seem to preclude being able to balance the carbs
across the rev. range; another compromise needed. However, if tickover speed
is to be low enough to land into short strips, the balance needs to be good
at idle speed.
I've got no further with finding out what it is that causes the variation of
balance; it may be tolerances in the pressed steel throttle arm and the way
it is tightened on to the throttle spindle; I'll explain further if you
haven't nodded off at this point.
Duncan McF.
----- Original Message -----
From: "Paul McAllister" <paul.mcallister@qia.net>
Subject: Europa-List: Carb balancing - Differential presure gauage ?
<paul.mcallister@qia.net>
>
> Hi All,
>
> I was pondering this exercise over the weekend. I have the gauges
supplied by Lockwood and I assume that this is what is recommended by Rotax.
They don't work that great and several people have been having more success
with manifold gauges from twin engine aircraft that have 2 needles sitting
on top of each other.
>
> I was wondering if this could be done with a single gauge that has a
center zero and maybe 5 ~ 10 psi either side. I haven't tired to locate
such a gauge but I shouldn't think it would be too hard to find one.
>
> Anyone have any thought on the practicality of this idea.
>
> Paul
>
>
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