Mailing List flyrotary@lancaironline.net Message #33726
From: Al Gietzen <ALVentures@cox.net>
Subject: RE: [FlyRotary] Re: It runs!
Date: Thu, 21 Sep 2006 20:40:50 -0700
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

 

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.

 

Timing marks on the pulley are set for timing on rotor one.  Spark on #2 should be 120 degrees later (40 degrees rotation of rotor) and another 120 degree later on rotor 3.  I don’t know about ‘waste’ sparks, but it does seem you should see consistent sparks at the right place for each rotor.

 

 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.

 

What do you mean by ‘embilical’ cord engine (I think the word is umbilical) – wires from the box to the engine?  Do you have the ‘triggering’ leads from box to coils separated from the leads from the CAS to the box?  I think inductive coupling there could be a problem, even if the CAS leads are shielded. I’m sure you’ve double checked all the coil wiring, ground points, etc.

 

Good luck,

 

Al

 

 

Any other good ideas?????

 

Bob Darrah

Seawind/20B

Near Austin, TX

 

(But my spell checker said it was ok)

 

 

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