I suggested the filter be placed on the breather door (inspection door) because the oil would be comming over the top of the crankshaft and headed down into the filter media. Based on what George B told me, I designed the pocket you see on the coppermine gallery.
Jack chose the ultimate in simplicty, and judging by his picture, bent the filter bottom so it would be close to the crank / rod to take the full impact of oil after it was accelerated over the crank by the 'windage'. Who knows? It might also be a power adding "Crank Scraper" like Hot Rodders talk about?
I particulary liked jack's comment on the ease of servicing, because you open this door to clean the sump when changing oil, so the filter is now sitting on the work bench just because you took the door off. I haven't run my filter setup yet, I just got my crankcase back from the hot tank, but it still needs alot more work before I start loading the guts back in.
Jack, I'm wondering what the oil in the bottom of the sump looked like?
Also, could you summarize the effect the filter is having? Is it cleaning up the oil? Does the sump seem any cleaner on the bottom when you squeegie out the oil at change time? Does the oil have less entrained moisture?
My old Lister manual suggests oil changes at 500 hours, whereas the ASHWAMEGH manual says 250 hours. Could the filter help extend the interval? Or do Listeroids only hold half as much oil?
Bruce suggests placing the filter in the small door under the cam. My twin does not have a door there, so I never thought of it.
George B says many old listers had these filters inside the sump, so It's nothing new, just a good idea revisited.