Cliff Shaw wrote:
> The way I figured it out, the water is on its way back
> when it goes to the little pot with the radiator cap.
> That is the way I plumed up my "skydrive" carb heaters
> .
Rob Housman wrote
> The "Operator's Manual for all versions of Rotax 914"
> page 9-1 of version Dec 01/98 has a diagram (Fig. 4) at
> the bottom of the page showing that the coolant flows
> from the water pump UP to the cylinder heads, up to the
> expansion tank, down to the radiator and back to the
> pump.
Thanks guys - you have confirmed what I thought. Which
begs the question about the installation instructions for
the carb heaters.
As instructed the water starts from the water pump, goes
through the starboard side carb, then through the port
side carb and then to the header tank.
HOWEVER. I see the starboard side as being the hotter side
as the airflow is restricted by pipes and also by the oil
dry sump tank, which itself is very hot. So the starboard
side has a heat advantage already over the port side. So
why doesn't the hotter water from the water pump get
directed to the port side first and THEN to the starboard
side ?
I mention this as, even with the carb heat kit fitted, I
am still getting the minor slight hiccups which I was
getting before the kit was fitted and which I have decided
(maybe wrongly) is carb icing. Today the outside temp was
about 12 degrees C and I got the hiccups. I shall do some
careful tests, recording ambient temps, carb body temp,
and oil and CH temps in the cruise after settling down to
see if there is any consistency about it.
The hiccups are quite minor but I hate to hear anything
which is not a continuous note from the engine.
Richard
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