Second Oil cooler

Walt, Very nice, really helpful,Thank you!  we are still in winter here in Alaska so I am waiting to see what happens with summer temps but I am guessing I may need do something like this. 

Hi Scott, how can I message you? Is there a way to send a DM through here? If not, are you willing to share your email? I like what you did here and had a few questions. Figured sending privately might be better.

Hi,  I don't know of a way to DM in the forum and I am pretty careful about posting my private email etc.  I see you just joined a couple days ago.  One of the great things about the forum is that others can learn form what is shared here.  I'm not sure why you are thinking it would be better to share info privately?

Scott, can you share more about what exactly you did here to drop the temps by 25-30 degrees? You posted two photos. One seems to show the cowling dumps air at the back and the other photo shows it completely closed off at the back. Which one is the before and which is the after? I’m trying to understand how to achieve “negative pressure” as I’m sadly not an engineer and I’m encountering the same high oil and high coolant temps with the 912iS that you we’re experiencing. 

Here are some more pics that show it better I hope.  All I really did was add and extension with a bit of a drop to the rear of the cowl.  I stole the idea from some of the Cub guys here in Alaska.  I'm not a Cub guy but apparently for one of the mods of float installs there is a similar cowl extension required.

I am not an engineer either, but  the cowl airflow depends on both the ram air at the front and the exit flow.  If you have a cowl that does not allow good flow at the exit as I did then an extension may help. With my cowl in it's original configuration It stopped about 3 inches short of the firewall and I suspect  that was creating some back flow and relatively high pressure,  By adding the extension with the sweep down as well the air flows smoothy over the bottom cowl and and, more or less like a wing, creates a lower pressure behind it. 

Anyway, that seemed to greatly increase the flow of air through the engine compartment and over the oil cooler without much if any loss of airspeed.

Hope this helps,

Scott