Hi David,
I have the Monowheel Classic with the Rotax 912ULS 100hp. This produces 8% more
heat as compared to the Rotax 912UL. Consequently I moved the oil cooler from
behind the port radiator to underneath the gearbox/spinner. I created an inlet
in the bottom cowl, without creating a ‘spitfire nose’ inlet, to allow air to
flow freely through the cooler and exit out the bottom of the cowl next to the
exhaust. I also have the Rotax shroud over the cylinders and created an inlet
either side of the spinner, one for air to flow under the shroud, the other for
cabin air. With this arrangement I do not have any problems with cooling. I
would not think any firesleeve/silver foil tubing would make a difference to
the temperature. The piggy back oil coolant on port radiator is not very
effective, as the air exit flow path is not good. I will send you a photo to
clarify what I have done.
Cheers, Tim
Sent from my iPad
Tim Ward
12 Waiwetu Street,
Fendalton,
Christchurch, 8052
New Zealand.
ward.t@xtra.co.nz
021 0640221
> On 1/09/2023, at 12:12 AM, Davidcripps <dpc@knightonweb.com> wrote:
>
> --> Europa-List message posted by: "Davidcripps" <dpc@knightonweb.com>
>
> As part of recent work replacing all oil and fuel lines in my Europa Classic
> Trigear 912UL, I added firesleeve to both the new fuel and oil lines. In
> addition I have added heat-reflective silver foil tube to the oil lines. This
> was done since some significant deterioration of the exterior of the
> previously uninsulated/unsleeved oil lines had been seen where the oil lines
> passed rather close to parts of the exhaust (unavoidable in the tight
> confines of a Classic!)
>
> While carrying out this work I also tried to deal with the previously seen
> 'high oil temperature in climb issue', by silicone sealing the oil cooler to
> the back of the port radiator, in order to ensure that more air went through
> the oil cooler and didn't leak around it.
>
> If anything, high oil temperatures in the climb have got worse since all
> these changes, requiring even more careful climb management, using multiple
> steps. It's manageable, but a bit of a pain, and that's in the not-too-hot UK
> climate. Oil temperatures stabilise around 115C once settled in the cruise,
> and water temps are completely fine, in both climb and cruise.
>
> Has the expected oil-cooling benefit of silicone sealing the oil cooler to
> the radiator been completely negated by the added insulation effect of the
> firesleeve/silver foil tube on the oil lines? I'm wondering how much oil
> cooling depends on radiation from the oil lines themselves? Does anyone have
> any experiences of the impact on temps of adding firesleeve to oil lines?
>
> My next planned step is to try to make a better seal of the port radiator to
> the cowl (not quite sure how to do this) and possibly add spacers to the
> bottom edge of the lower cowl to increase exit area. From reading the many
> useful postings on cooling issues, these would seem to help, but should I
> take off the oil hose firesleeve instead/as well? I would welcome any
> thoughts, ideas and comments!
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=511385#511385
>
>
>
>
>
>
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