fredshiple(at)sbcglobal.n
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 Posted: Mon Aug 21, 2006 7:06 pm Post subject: oil temps 912S/S-6 on floats revisited |
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About two months ago I outlined an oil temp problem I was seeing in my newly float equipped S-6 with 912S. I was flying 10-12mph slower at 105mph with the new floats and began seeing redline temp (260F) with ambients over 80F.
Lockwood advised a larger (by about 75%) oil cooler they use for the turbo 914. Kept it in the same below prop position. Temps went down to Yellow arc (240F) at 85F, but back to 260F in the low 90's.
Talked to John McBean at Oshkosh and he had several suggestions:
The lower cowl outlet on the bottom of the S-6' cowl has a 5/8" flange (?for stiffness) that he removes on the new Kitfox (uses a smaller and flatter stiffener inside the cowling). I trimmed mine the same way and problem was completely solved. Now see no higher than 220F on climbout in the low 90's. Throughout, the cylinder head and water temps have been fine, but I did see a 10-15 degree lower water temps with the cowl modified. It took both the larger cooler and the modified cowl to get results.
The last step would have been to use John's large NACA duct on the bottom of the cowl for independent cooling air, but that wasn't necessary. He attaches his oil cooler to the front of the radiator below the engine, attached to the motor mount with the the NACA duct plumbed directly to the cooler and radiator.
Fred
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