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Bob, I have no experience with the ignition on the 20B. However, I suspect that some of the sparks you are seeing may be "waste sparks". The 13B uses the "waste Spark" on the trailing plugs - the spark plug fires but it is during the exhaust stroke - so has no effect, but does simply the ignition design. So the sparks you are seeing that surprise you may be "waste sparks". OR you could have an ignition problem.
Ed
----- Original Message ----- From: "Bob Darrah" <RDarrah@austin.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, September 21, 2006 4:02 PM
Subject: [FlyRotary] Re: It runs!
20B It still runs, but not good. Thanks for all your suggestions. New gas with exactly measured oil made no difference.
However, I put the timing light on each of the plug leads and was really confused at what I saw.
#1, both lead and trail, 35 degrees before TDC So good so far.
#2, " " " " mostly 35 degrees Btdc, and an ocasanal 120 off from that
# 3 A lot of 240 degrees (about where it should be) and a lot at 35 Btdc.
After looking at that, I am surprised it runs at all. And Tracy won't be back till next week. I am hopeing that the extra length of my embilical cord from the firewall to engine (Seawind) accounts for all of that, but I have a hard time convincing myself that is so.
Any other good ideas?????
Bob Darrah
Seawind/20B
Near Austin, TX
(But my spell checker said it was ok)
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