I used the RV4 drawings that I borrowed to draw up
an RV4 motor mount.

Boy that was a tight squeeze. Without those cowl cheeks
on there I don't know how I would get a rad under the cowl
and still get the air out from behind it in a reasonably
low drag way.

The other weird thing about this is the way Van took the
aft bending loads from the landing gear. You need to run two
tubes from the tops of the landing gear out to each
rubber bushing tube cluster to take these loads.

One of the things taking up so much room in there is that
foot box for tall people. If you are short you might be
able to get the engine in there with out extending the
cowl as shown. Yes the PSRU is the 14.5 inch version.
Perhaps you can notch the foot box in the center
to clear part of the engine.

The muffler will be a tight squeeze too. 

The rear motor mount should be no problem as it is
right next to the top of the landing gear.

Paul Lamar
 
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