Sky Tractor offers a filter kit for large radial engines, but it uses this large 12″ long Fram PH3335 oil filter. If bigger is better, why don you use this large filter?
Bigger is not always better. The Fram NASCAR filter we use will handle 20 gals/min oil flows all day long. It was designed for the exacting and very expensive NASCAR engines. If you think we have expensive engines in airplanes, ask the price of a NASCAR engine. Anyway, after digging up some internal documents at Fram, we found that the PH3335 filter was designed for 10-20 gal/min flows. When we pressed Fram for why the big difference in oil flows, their reply was that this filter was designed for large diesel engines, with very thick oil, just like a radial engine, but at not very high flow rates, so this wide range was just fine. Well what might be fine for a truck, is not fine for an airplane engine. Since you never know how tight or fine the media will be in one of the replacement PH3335 filters, installing it on a large Pratt or Wright, might mean that the filter is bypassing inside. I know it is hard to believe with such a large filter, but it does happen. Also, many people don’t
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