OS 1.60FX: Which Perry Pump?
I have an OS 1.60FX on a 1/4 Scale Hangar 9 CAP 232 that rattles and pings in the midrange. It's done this ever since it was new, but it got worse once I went to the Bisson Pitts muffler.
From my research, it sounds like I need a pump. Now, which one? Looking at the Perry pumps website, both the VP20 Oscillating pump and the VP30 pressure-actuated pump have the same statistics. I like the idea of not having to disassemble my engine to cut holes in it, but it seems very few, if any, people are using the oscillating pump.
Can I simply tap out the backplate of my engine for the VP30 pump, or do I have to drill a hole in the crankcase?