Not certain about the 20 B, Phil.
However, those sound like the may be the holes for the “Knock” sensor on the car. But, I don’t
believe those go all the way through. The oil injection holes do, but they are
on a different side of the block.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Phil White
Sent: Sunday, August 16, 2009
11:52 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] 20B - holes
above plugs
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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