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Length of drain
MSHAC,
Your perception may well be correct, but my guess is that the amount left behind is going to be a very small amount. I have not measured the threads of the oil pan to be able to determine how much may get left over, but if they are designed properly, they should not leave any behind.
That being said - the design of the IO-360 oil pan does locate the drain in such a way that is very effective in draining, and if there was small amount that was not drained, it would likely be in the range of only a tablespoon or two. In my experience, this is completely acceptable, and still way more effective than using the suction device (unless of course, you can guarantee that the suction device is at the bottom of the sump). There will always be that little bit of sludge/carbon that will accumulate in a pan (in my opinion), and the net benefit of the quick drain is still far greater than the mess the old way of draining the oil can make. Of course, I say all this with the full expectation that everyone has oil filter systems installed, is changing the oil when it is hot (and not sitting long) and is changing their oil at proper intervals for how they are operating their aircraft.
If anyone has an oil pan on the shelf or next time they remove a plug, could measure the depth of the threads - we could validate approximately how effective the quick drains are.
Jeff
P.S. As a side note, on a different engine OEM, I once had a cam shaft crap a bearing into my oil pan. I discovered this after investigating why my oil pressure had a change of about 5 PSI (but still well within limits). I had a new gasket for the pan, and thought at the time I will have a look at the screen on the oil pump pick up while have it off. As I walked the oil pan over to the bench, I noted large pieces of material in my oil pan and thought to myself...this is going to be expensive. Anyway, the point is, metal deposits may or may not come out of the drain, regardless of the drain type, but certainly less likely with a quick drain. However, the most effective tools to mitigating that or any other particulate issue in the oil, is a filter.
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