Could well be related to heat; the inlet manifolds have been hot and cold
starting remains easy. However, fuel IS getting through because fuel vapour
can be seen "puffing" out of the exhaust pipe. If it's too much fuel, then
trying to dry out by cranking at full throttle doesn't help (and probably
wouldn't anyway with CD-type carbs.). Can't see why over hot fuel would be a
problem, so long as its still present as a vapour rather than as a 'gas'.
Maybe it has something to do with winter MOGAS; other forums have recorded
that these problems are eased by use of AVGAS. Also, inlet air is taken from
under the cowl, which would exacerbate a heat-related problem.
Duncan McF.
----- Original Message -----
From: "nigel charles" <nigelcharles@tiscali.co.uk>
Subject: Re: Europa-List: Rotax starting - 912S
<nigelcharles@tiscali.co.uk>
>
> >By the way, I'm having ENORMOUS problems with hot starting at the moment,
> which doesn't seem to be related to any of the related issues discussed at
> length on this and parallel forums. Hope its not another symptom of the
> clutch problem (there's no banging and shaking, just no firing at all).
Any
> ideas out there?<
>
> Perhaps it might be fuel vapourisation. I have a fuel temperature gauge
> which measures temperature at the carb inlet and the temperature jumps up
by
> about 10degC within 5 minutes after shutdown. I leave the inspection
panels
> open during short turnarounds which helps cool the engine compartment
> significantly. If it is fuel related then a check of a plug after several
> start attempts will show a dry plug.
>
> Nigel Charles
>
>
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