Mailing List flyrotary@lancaironline.net Message #27442
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Timing
Date: Fri, 4 Nov 2005 09:05:20 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message
 
 Joe, one thing to keep in mind.  Your static timing setting is really setting your Maximum possible advance - in other words, you can NOT advance the timing beyond that point by electronic means.
 
However, the controller can retard the timing simply by delaying the time at which it fires the ignition modules.  Your "Advance" under those circumstances is really "less retard".
 
So if you can not get sufficent advance then you must Mechancially adjust the static timing.  I mark on the pulley my static timing point (35deg BTDC), then I pull the crank angle sensor and rotate it so that the prong of the two prong rotor with the red dot on it is aligned with the metal core of the pick up coil which has a red dot.  (The pick up coil on the side of the housing toward the pulley). When you reinsert the crank angle sensor the merging of the gears will cause it to rotate - so you might need to move it one way or the other a tooth.
  At that point I have 35Deg BTDC static timing.
 
Now your system may call for different settings and I am not going to tell you they are incorrect - but make certain that you understand the timing markers on your pulley.  I know some of the after market pulleys are marked different from the stock pulley.  And if you have a stock pulley that does not match your engine (it has happened) that can also add confusion to the "real" timing.  I understand that the timing reference pointer can be different from the 12A to the 13B cover as well.
 
You'll get it sorted out shortly. Main thing its RUNNING and Noise is being make and exhaust gas are filling the air! {:>)
 
Ed A
 
 
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