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1. 01:14 AM - Re: Oversized Oil Cooler Installation For IO-390... (Don)
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| Subject: | Oversized Oil Cooler Installation For IO-390... |
Matt,
I also noted that you are using the red fire sleve that is mounted using
hose clamps. Nothing really wrong with this but a safer and better looking
hose is available from http://www.herberaircraft.com/prod_hoses.htm. Theese
hoses are installed on my bird for fuel and oil lines everywhere onder the
cowl. They look great and provide better fire protection than the hose clamp
mounted type. Just my two cents worth.
Don VS RYV7 flying
-----Original Message-----
From: owner-rv7-list-server@matronics.com
[mailto:owner-rv7-list-server@matronics.com] On Behalf Of Matt Dralle
Sent: Sunday, October 18, 2009 9:37 AM
Subject: RV7-List: Oversized Oil Cooler Installation For IO-390...
Since the IO-390's a little bigger than the 0-320's and 0-360's
traditionally used on the RVs, there have been reports of issues with oil
temperatures climbing too high. Marc Ausman has some very interesting
findings on his web site http://www.io-390.com regarding his experiences
with the IO-390, his RV-7, and some various oil cooler installations he
tried. Essentially, it boiled down to using a Steward Warner 10610R oil
cooler to keep oil temperatures in a normal range. The problem with the
10610R, however, is that it is a LOT bigger than the stock Van's oil cooler.
Mark had trouble fitting it on his RV-7 and I've got even less space on the
RV-8.
So, once again, I found myself having the re-engineer to accommodate the
IO-390 engine installation. The rear left baffle with the Van's supplied
.040" doubler is sufficiently rigid for the stock oil cooler, but the
SW10610R is quite a bit heavier and also about 1.5 times as wide. Initial
fittings looked like it was going to be a close fit if it would fit at all.
I spent the good part of two full days working on a new design for
installing the SW10610R. I came up with a .063" double that completely
shadows the rear baffle and also ties into the angle on the right of the oil
cooler. I emulated the flow baffles on the stock double by cutting the rear
baffle hole slightly large then bending them back and through the hole in
the .063" doubler. I spent a lot of time carefully measuring and cutting
and filing the paired holes and I'm extremely pleased with the fit and
function. I riveted the rear baffle and the .063" doubler with a matrix of
1/8" rivets at 1" spacing. Probably went overboard here, but I have to say,
it really stiffened up the structure, so maybe it was worth it.
I orientated the oil cooler such that I was able to catch the mounting screw
in the back of rear cylinder. This will take a huge amount of load off the
baffling components and I'm really glad I noticed that I could use it with
just a little bit of shifting. I also added a 4" long piece of .063" angle
cut down on one side to the center rear baffle picking up the 1/4 mounting
screw hole. This also really tightened up the structure.
I had to file a large half-moon shape out of the right-rear mounting ear on
the oil cooler to clear the engine mount. It is not used structurally on
the oil cooler so no harm done. I opted to use all six mounting screw holes
on the oil cooler instead of the normal four. This also seems to stiffen up
the installation.
The oil cooler is sufficiently mounted in toward the centerline such that
there are no clearance issues with the cowling, although there would have
been if I hadn't hogged out such a large half-moon from the oil cooler
mount.
The best part of the installation is that the hose fittings are nearly in
the stock location, so I will be able to use the standard hose that come
with the FWF kit. Whew, for once, something works without modification.
All in all, I'm extremely pleased with the oil cooler installation. It is
very solidly mounted, still uses the stock hoses, and clears the cowling.
There are a few more pictures at (Logs 01-11):
http://www.mattsrv8.com/users/display_log.php?user=MattsRV8&project=638&cate
gory=2972&log=90253&row=12
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's All New RV-8 Construction Blog
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