The cooling




To cool the engine, normally you use baffle’s to press the air via the engine.
Mark L did a great job to make plenums. This way, you have more efficient cooling of the engine and the forces
are less on the engine cowlings.This means we can make a lighter engine cowling .
One of my dutch friends (Cherry bx2) builder did almost the same with his bmw engine. I will try to copy
his system.

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Plenum Andre G made in the Netherlands.

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First I made a spacer 8 mm on top of the cool ribs.

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3 layers of 260 gr cloth will do the job.

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I still have to make some changes

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One part finished, one to go.

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To get acces to the injector system I plan to open up the compleet upper part with a hinge system.

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Fuel system needs acces into the planum.

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Within 10 sec we now have acces to the system. Fuel hose and throttle cable stay in postion.

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Oil cooler in place. Some of the BMW guys are flying with 18 rows cooler. Result in the winter the oil
stays to cold. We will try 13 rows. Hopefully this will be enough in summertime.

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Because there were some problems with the delivering of our prop we decided to make first the airbox / planum.
This was a bad decision, when the prop arrived we made the engine cowlings.....the planum did not fit anymore.
So we had to modify the box.


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made also a bypass duct to arrange some more cold air at the muffler.
The small tubes gives the alternator some cold air.


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After 3 times a modification this is the final result. Light weight and quick removal planum.

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