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Janekom 12-29-2011 11:32 PM

Thanks Alton!
There is a "contact" form at
Otherwise as suggested please use webmaster "at"

Dean - I have replied to your e-mail the best I can.

Paul - seeing that you are in the RSA you can phone Deon on 082 seven seven three 5135 for his opinion. The first one was fitted on his RV7A, ZU-EXI. We drilled out all the rivets, removed the rubber seals and fitted it in two hours. Obviously it does not look so neat with all the redundant holes but is working fine. Note that this one also did not have the nice and shiny clear coat finish.

islandmonkey 12-30-2011 03:09 AM

Any plans for an 0320 size plenum for an RV-4 Jan? I would be very interested. I am also in no rush either so I am willing to wait for you to produce one if it is on your plans.

Janekom 12-31-2011 05:43 AM

Hi Anthony,
Not many RV4's around here so it will be a battle to find one to make the mold from. When and if I do that it will be posted in the RV4 section!

tgmillso 05-15-2015 04:05 PM

How did it perform?
Hi Jan. Can you provide some feedback on how the plenum performed from a CHT and speed perspective?

AltonD 05-15-2015 05:23 PM

My in-flight CHTs did not change much. What did change was the CHTs on takeoff climb out. Before, I would have to push over pretty quick for a 120 knot climb out. Now, it is almost never an issue. My general procedure to warm up the oil for change is to takeoff and pull for 90 knots and hold till oil temps are170-180 F. I usually level out 6-7000 feet all heated up.
I could not do this before installing the plenum.

Janekom 05-19-2015 12:12 AM

Hi Tom,
I always say that if you can build perfect rubber seals, you do not need our plenum lids. BUT even if you build them perfect, down the line there will be points where they sag or fold, causing air leaks.

On a new build and plenum you will not see any magic happening. On a retrofit you will see better cooling figures. In summary - the plenum gives you a life long air tight fit. :)

Remember there is an install guide line doc on

Any of those email addresses will reach me.

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