Oil Cooling hell.

Yesterday, I went from having a flying airplane back to having a project.  For quite a while now, my oil temperatures on hot days and climbouts have been marginal to unacceptable, and since I have the break in the work schedule, I figured I’d do something about it.   So I joined the Compton EAA chapter and rented a space in the hangar for a month while I sort it out.  My oil cooler is the stock Van’s 7-row Niagara oil cooler that seems to work on most RV installs, but not mine.   There are a few reasons this might be: timing, blow-by (which would suck, the cyls are more or less new) bad baffling (worked when I first flew, so wtf) or carbon deposits in the cooler.  It’s actually fine as long as the OAT is 65f or below.  I can settle in to cruise at 190-195F no problem.  But on hot days, or long climbs, I will go above 220 real fast, and that’s no good.   Last year, I purchased a 10-row cooler with the intention of replacing the stock one, but I never put it on.  I first attempted to seal up any baffle leaks.  This improved things a bit, but not enough to matter.  Cylinder head temps are fine.   I’ll hit 400 on those if I mash it and rabbit up to 10,000ft, but they cool down pretty fast once leveled off, and usually settle in around 350-375.  I’m sure there’s more I can do, but for now I need to solve the big one.

The 10-row cooler will not fit on the back of the baffle like the stock one does.  It’s too wide.  There are a number of ways to mount the cooler on the firewall, but none of them work because my firewall is already full of stuff, namely the RDAC, fuel pump, and brake line fittings.

I supposed I could probably move the RDAC and fuel pump, but that’s less appealing to me than mounting on the engine mount and connecting it with a SCEET tube to a flange on the baffle where the original cooler was mounted.

So it’s off to Compton I go, first to do exploratory surgery, then some design work, and then hopefully some fabrication.  They have ALL the tools.

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