Hi David,
I have the Monowheel Classic with the Rotax 912ULS 100hp. This produces 8% m
ore 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 a
n inlet in the bottom cowl, without creating a =98spitfire nose=99
inlet, to allow air to flow freely through the cooler and exit out the bott
om of the cowl next to the exhaust. I also have the Rotax shroud over the cy
linders 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 h
ave any problems with cooling. I would not think any firesleeve/silver foil t
ubing 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 go
od. 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:
>
.com>
>
> As part of recent work replacing all oil and fuel lines in my Europa Class
ic Trigear 912UL, I added firesleeve to both the new fuel and oil lines. In a
ddition I have added heat-reflective silver foil tube to the oil lines. This
was done since some significant deterioration of the exterior of the previo
usly uninsulated/unsleeved oil lines had been seen where the oil lines passe
d 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 t
o the back of the port radiator, in order to ensure that more air went throu
gh the oil cooler and didn't leak around it.
>
> If anything, high oil temperatures in the climb have got worse since all t
hese changes, requiring even more careful climb management, using multiple s
teps. 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 f
iresleeve/silver foil tube on the oil lines? I'm wondering how much oil cool
ing 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 t
o the cowl (not quite sure how to do this) and possibly add spacers to the b
ottom edge of the lower cowl to increase exit area. =46rom reading the many u
seful postings on cooling issues, these would seem to help, but should I tak
e 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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