Phil,
My 20B had knock sensors threaded into those holes. I didn't use the knock sensors, so there are just three threaded holes in my housings. They don't go all the way through, but maybe someone would like to try using them for direct injection???
Mark S.
On Sun, Aug 16, 2009 at 10:51 PM, Phil White <philwhite9@aol.com> wrote:
Bill, Tracy: I have just now noticed that the 20B rotor housing has a treaded hole about an inch above the upper spark plug hole. There appears to be a small hole at the bottom into the rotor chamber.
What is this for? For aviation use, should it be plugged? If so, do you know what size thread is needed?
Phil
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