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Rob's REBVAIR Project
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Date: 5-1-2014
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Number of Hours: 10.00
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Manual Reference:
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Brief Description: Engine Baffling Part 4
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Here we get into the second most challenging area. The oil cooler install. Oil coolers can be mounted literally anywhere: the only considerations are available space, and an adequate source of cooling air. Many certificated installations have the cooler mounted on the firewall, with a duct feeding it cool air from a flange mounted on the baffles. My local A&P recommends this install, as he claims coolers installed on engine baffles are more prone to cracking due to engine vibration. W. Wynne on the other hand, prefers to mount coolers in the way described here, as it provides for a more compact installation. Presumably,the 6-cylinder corvair runs so smoothly that vibration is significantly less than lycoming 4-cylinder powerplants.
Also wanting to avoid additional SCAT tubing running through my engine compartment, I too have decided to follow the WW procedure, but use 0.032"material for extra strength instead of the 0.025" used everywhere else.
There are several brackets of several shapes and sizes to fabricate here. Fortunately none of them are particularly difficult, and again, it makes for a pretty rewarding few hours of fabrication.
Based on the top spped of this aircraft, and STOL climb angles, I followed WW's advice on a 9-plate cooler. However, I may need to swap this out for the standard 7-plate cooler because I'm unsure if the intake manifold pipe will clear the cooler itself. Consider Image 3, and imagine the intake following the path of the header stub (blue plastic), then turning 90 degrees down and in, toward the carb (behind and under the engine). I'm pretty sure the pipes are going to hit the edge of the oil cooler...the only question is whether or not it will be a small enough interference that can be cut out.
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rear of engine
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9-plate cooler
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left rear view
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