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Jabiru sump mounted oil cooler baffle

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Jabiru sump mounted oil cooler baffle

Postby diablo » Tue Dec 27, 2016 9:21 am

I have designed a baffle that fits under sump that is aimed at improving oil cooling without having to fit a TOCA or oil cooler. The baffle should channel air entering cowling via the opening just below oil pump, through sump fins and allow air to exit via opening at bottom of cowling.

The desired effect are:

1. less disruption of air flow from cylinder heads cooling baffles so more efficient cooling
2. oil maintained within prescribed temps by adjusting flap via push/pull plunger in cockpit so making the TOCA, oil coller and hoses redundant
3. simplify and reduce weight

Here are some images ...

DSCN0681.JPG
Cowling lip
DSCN0681.JPG (3.83 MiB) Viewed 3297 times


DSCN0683.JPG
Sump baffle 1
DSCN0683.JPG (4.5 MiB) Viewed 3295 times


DSCN0682.JPG
Sump BAffle 2
DSCN0682.JPG (4.25 MiB) Viewed 3295 times


DSCN0680.JPG
Air inlet on cowling
DSCN0680.JPG (3.68 MiB) Viewed 3297 times


Feedback and thoughts please ...
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Re: Jabiru sump mounted oil cooler baffle - Latest

Postby diablo » Fri Dec 30, 2016 8:40 am

Here are the latest images ....

DSCN0695.JPG
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DSCN0697.JPG (4.37 MiB) Viewed 3213 times


DSCN0696.JPG
DSCN0696.JPG (4.14 MiB) Viewed 3215 times


Dscn0698.jpg
Dscn0698.jpg (553.26 KiB) Viewed 3215 times
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Re: Jabiru sump mounted oil cooler baffle

Postby diablo » Tue Jan 03, 2017 10:58 am

Following further work, find attached last images. Hopefully test this saturday following some further aly welding!

IMG_5499.JPG
IMG_5499.JPG (383.56 KiB) Viewed 3201 times


IMG_5497.JPG
IMG_5497.JPG (345.12 KiB) Viewed 3201 times
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Re: Jabiru sump mounted oil cooler baffle

Postby Garyo » Fri Jan 06, 2017 7:25 pm

Thats a nice bit of tinware Deano, interested to see the results, but this rime of year had to tell, my couling intake is fully blanked off now till spring as cannot get the temp up regardless what I do
Former Owner of
G-OMER
Jabiru 450 UL
Engine serial 1041
1 CHT sensor on No 4 under plug
No Exhaust temp sensors
No glass panel
No xponder
Microair radio
No bells and whistles
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Re: Jabiru sump mounted oil cooler baffle

Postby diablo » Sat Jan 07, 2017 5:10 pm

Gary,

working with aly is easy peasy. I weld using durafix rods and the finish is brilliant. Here are the latest images. Hopefully testing soon ...

IMG_5536.JPG
IMG_5536.JPG (327.18 KiB) Viewed 3178 times


IMG_5537.JPG
IMG_5537.JPG (423.13 KiB) Viewed 3178 times


IMG_5539.JPG
IMG_5539.JPG (504.58 KiB) Viewed 3178 times


IMG_5538.JPG
IMG_5538.JPG (463.16 KiB) Viewed 3178 times
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Re: Jabiru sump mounted oil cooler baffle

Postby diablo » Thu Jan 19, 2017 8:52 pm

Did some flight testing today following completion of the sump baffle. Flew for around ½ hour. Outside temps were low (in the 5-7 centigrade).

Ground testing
I can report that the engine definitely took a lot longer to warm up. I was on the ground for around 10 mins getting CHTs up to around 90C and OT to around 50C.

In the air
OT slowly climbed to around 85C when running at 2800 RPM. I think it would have kept going up but doubt very much it would have got to the limits as on easing off the power, it quickly cooled off to 65-70C and stayed there.

I monitor all four CHTs. Amazingly, with all of the holes closed off (only bottom opening and air intakes open) temps were remarkably lower. CHTs never went above 115 (hottest) with coolest showing around 105. On final, and at low RPMs, CHTs and OT seemed to really cool off.

Discussion
I will have to do some further testing but feel I have a result as there has been a significant reduction in CHTs and OT seems to be within acceptable limits. My next test will be a 5 min climb at full power and flat out straight an level for 10 mins. I want to see what sort of range temps span …

I will continue posting updates ...
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Re: Jabiru sump mounted oil cooler baffle

Postby Jon » Mon Feb 06, 2017 10:06 pm

This looks like a very interesting mod. Is there any news on benefits? Sonex reported that up to 30% of cooling could be achieved by using a similar baffle system and the Czech Samba aircraft uses a scoop for all of its oil cooling. Would be nice to get rid of weight as well and other bits that could possibly go wrong and improve by doing so reliability of engine.

Has anyone heard of a new mod to head covers? Seems that someone is developing aluminium finned cylinder head covers to aid cooling of heads. Sounds like a good idea and I for one would be up for six of those!
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PostThis post was deleted by diablo on Sun Sep 24, 2017 1:38 pm.


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