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Matt Dralle's RV-8 Project
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Date: 10-10-2009
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: IO-390 Oversized Oil Cooler Installation - Part 01
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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 a bit 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 (pun intended) to using a Stewart Warner 10610R oil cooler to keep his oil temperatures in a normal range. The problem with this, however, is that the 10610R is A LOT bigger than the stock 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.
Cont. Next Log...
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Stewart Warner 10610R Oil Cooler
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Stock Oil Cooler vs. SW10610R
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Initial Mounting Template Fitting
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Copyright © 2008-2024 Matt Dralle. All Rights Reserved.
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