Engine Cooling for the Jabiru engine

The Jabiru Engine which is used in many other aircraft.

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Patrick H
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Re: Engine Cooling for the Jabiru engine

Unread postby Patrick H » Mon Jan 08, 2018 10:13 am

I'm really keen to see the improvement. I think you are on the right track. Cool everything not just the cylinders and heads. I'll be your first customer. Well done for the initiative. Please keep us posted.
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lessersg
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Tue Jan 09, 2018 1:18 pm

Yea,

That was my thinking as well. Radiated heat from the crank case either way Im sure is not helping. System seems to work quite well on any other air cooler engine why not Jabiru...anyway we will see.
J430
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Re: Engine Cooling for the Jabiru engine

Unread postby J430 » Wed Jan 17, 2018 1:51 pm

This has been done before using aluminium on a Bristell with a Jabiru 3300 in Australia. Much time was spent by the LAME's with lots of little modifications to get the temps all equal. The end result was 120-125c all round.
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Re: Engine Cooling for the Jabiru engine

Unread postby Patrick H » Thu Jan 18, 2018 9:09 pm

That's excellent on a Jab 6. With those temps it will last forever. Heat is the biggest killer of the Jab.
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lessersg
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Tue Jan 30, 2018 7:26 am

Below was the last flight we did with OAT at 32 deg. So with solving all the leaks we can from the ram ducts and NACA duct plus a small mod the CSP airfoil this was the result. Circuit work touch and go's brought the highest temp to 158 C.

Im sure the plenum will make a huge difference. Still not finished

I would say a happy engine .....max power no messing around...
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Re: Engine Cooling for the Jabiru engine

Unread postby AJW » Tue Jan 30, 2018 7:33 am

lessersg wrote:Below was the last flight we did with OAT at 32 deg. So with solving all the leaks we can from the ram ducts and NACA duct plus a small mod the CSP airfoil this was the result. Circuit work touch and go's brought the highest temp to 158 C.

Im sure the plenum will make a huge difference. Still not finished

I would say a happy engine .....max power no messing around...

Sorry if I missed it, but what was your altitude, fuel flow and speed ?
Please.
Be safe
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lessersg
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Tue Jan 30, 2018 7:37 am

Climb out ...its on the IEFIS, Ground temp 35C
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Re: Engine Cooling for the Jabiru engine

Unread postby Pepler » Wed Feb 07, 2018 8:14 pm

Is this "mod" in production already. When can we order =D>

Bring it to Surherland on the 24 & 25 for hot and high please.
http://avcom.co.za/phpBB3/viewtopic.php?f=307&t=197861
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Thu Feb 08, 2018 11:45 pm

Im doing the first layup tomorrow. So hopefully testing early next week.
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Sat Feb 10, 2018 11:43 pm

Started the fitting and adjustments today.....
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Sun Feb 11, 2018 8:07 pm

Progress,

Hope to finish off by wednesday or so, but looking good everything fits nicely.
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Re: Engine Cooling for the Jabiru engine

Unread postby J430 » Tue Feb 13, 2018 1:05 pm

It's going to be very interesting to see how that beast performs!!
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Tue Feb 13, 2018 9:52 pm

Last few items to do , 4 x baffle plates for un der the cylinders will be done tomorrow these will be made from .6 mm aluminium Final fitting tomorrow and hopefully testing Friday. So far I have three moulds, 5 templates which make up this plenum.

The current mould will not be the final product, this one now is the test bed. The original mould will be modified, and a new plug made from it should the full plenum work. No reason why it shouldn't be a success.

The top piece, main section and the bottom intakes will be common to all 6 cylinder jabs. The side plates will have to be fitted. Anyway when all is done and working ill put something together so all can see how this goes together. Should not take more than an afternoon to install.
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lessersg
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Tue Feb 13, 2018 10:09 pm

FYI, what we found during the whole exercise of improving the cooling that by eliminating the air leaking past the oil cooler , sides and top the temps drops about 10 c all around. So I can quite easily say that sealing that and sealing all the holes on the ram air ducts dropped temps by early 15 c. The originals have huge holes on the left rear cylinder 5 and look on the right side rear cylinder 6 top. Theres at least a 10mm gap on top off the cylinder and at the rear this doesn't help for cooling at all.

In front on the right side cylinder 2, 5-10 mm gap---air takes the shortest route. We did not mess with the factory setup of the deflectors inside the ram ducts at all.
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Re: Engine Cooling for the Jabiru engine

Unread postby lessersg » Wed Feb 14, 2018 9:04 pm

Finished the fitting today looks good fits nicely. Two small issues at the back both left and right. Will make up plates and install tomorrow holes are a bit big. Need to drill the holes for the plug leads and install grommets and fit the baffle plates under between the cylinders. Then testing. For the test will seal around the starter motor and right rear with some Red Devil Silicone. Version two will have rubber edging. Plus the starter motor will be under the plenum , theres enough clearance between the starter and the underside off the cowl. V 2 will also have a depression on the top of the cowl for the oil filler cap and cowl latch mechanism.
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