Posted for "sqpilot@earthlink" <sqpilot@earthlink.net>:

Hi, Jack....we looked at that possibility. A couple of problems, however.  A lot more machining, cost and complexity because of the 2nd 90 degree angle. We initially tried it that way, but then the filter would interfere with my oil pressure sending unit and my 5/8" heater core nipple. That meant I would have to relocate the oil pressure sending unit and try to find a 90 degree heater core nipple. It would create more work for my installation.
     If the engine hasn't run for a couple of hours, there is very little oil left in the filter, and by merely placing a rag or a thin plastic plate under the filter, there shouldn't be an oil clean-up problem. Our forklifts where I work have the oil filters mounted horizontally like this, and changing oil and filters is a non-event if the engine hasn't  been running  for a few minutes prior to changing the filter.
      We were also concerned about having a longer adapter, with a second 90 degree angle might possibly place more stress on the mounting screws and O-rings, since it is only held on by two small bolts. The further out we have to go, the forces rapidly increase on the mounting pad.  Haven't totally ruled it out, but it definately would be a lot more machining, material, cost and complexity.  Thanks for your input.   Paul Conner