Mike and I were talking at Copper State on where to
put his oil cooler. Mike is talking about redoing
his motor mount to make room.

Here are a couple of pictures of his engine arrangement.

I need a few dimensions for a 3D Mike.
Diameter of the spinner?
Distance from spinner back to firewall.

I have the rest of the RV4 dimensions.

Looks like one of Jerry Hey's motor plates would be ideal.
The left side top diagonal tube would clear the exhaust
system if the up and down position of the left side rubber
bushings was chosen properly.  If the right side rubber
bushing was far enough outboard you might be able to
squeeze a stock oil cooler long ways outboard of
the spark plugs dumping air out the side of the cowl.

You could take it all apart and ship your motor mount to
Jerry Hey for modification. No need to make a new cowl.

Something similar to this 2D drawing.

Paul Lamar

Paul,

  I'm not redoing the motor mount. I am going to modify the top of the cowl
to accomodate a more standard forward facing inlet scoop and a top of the
cowl air exit. You should appreciate this since the inlet that I'm deleting
is one of those no good NACA scoops.  :-)

  Those are some pretty old pictures. The oil cooler will sit in the space
behind the alternator shown in that first pic. The alternator is no longer
in that position. Its been relocated to the plugs side to make room for an
inlet duct.  The ducting for the oil cooler will be almost identical to my
rad ducting with venetian blind cowl flaps in the top of the cowl to
regulate airflow through the cooler.

  Mike Wills

So it will be a more or less rectangular Setrabe oil cooler?
Sounds cool looking Mike (pardon the pun) :-)

Paul Lamar

  The Setrab cooler I have will fit in there. The core on the Setrab is
about 11 x 8 x 2. If the ducting is right it should be big enough. But with
this latest config of my cowl I think I can get a larger Fluidyne dual pass
cooler in the space available. The dual pass cooler has much better
placement of the fittings so the hose runs will fit the available space better.

  It pains me to ruin the top of the cowl line with a large scoop. And I'm
not real excited about the top exit either. But I'm tired of messing around
with different configs and making no progress. This current iteration
doesnt look as good as previous ones but should work (unlike the previous
iterations which looked good but probably wouldnt have worked).

Mike Wills

 
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