Graham Singleton wrote:
> >Would just like to add that I know of two cases here in Austria where the
> >plastic expansion bottle ruptured due to extensive heat and/or pressure
> >and due to the fact that the very small vent hole incorporated in the
> >screw cap was obstructed and possibly even totaly blocked!
> >I would strongly recommend to check the vent hole in the red screw cap of
> >the expansion bottle!
> >In my opinion the vent hole - at least on my cap - was hardly visible and
> >seemed too small; therefore I increased the size of the vent hole to 1,5
> >mm and also drilled a second vent hole with a diameter of 1,5 mm.
> >
> >Klaus
>
> Thanks for that Klaus, good to know I wasn't the only one! (Sort of)
> If I ever install another Rotax I will add an overflow pipe to take any
> boiling coolant overboard. I understand the BanBi already does this.
> Sensible IMHO.
>
> Graham
>
This is what we did on our XS with 912S,
drilled a hole for a small brass tube,
which was reduxed into the cap,
then attach a tube which goes to the
bottom of the engine compartment to
get rid of any overflow coolant.
We did a similar thing to the bottom,
both sides, of our carb intake plenum,
with tubes` leading any float bowl
overflow, etc. to the bottom of the
engine compartment.
Terry Seaver
A135
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