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Finn is right. Static timing means with the engine NOT running. You adjust the crank angle holder (sometimes required to loosen the bolt completely and lift it free of the drive gear on the E shaft and rotate it a tooth way or the other) until when the e shaft pulley is at 35 deg BTDC with the timing pointer on the front cover, the end of big tooth wheel of the crank angle sensor with a red dot on it is pointed at the metal core of the reluctor coil (also with red dot) inside the crank angle housing. (Note: This step appears not to be critical - in that even if you get it 180 deg out with the red dot tooth NOT matched to the red dot on the coil, the EC2 will still get the correct signals). You will normally have to rotate the crank angle sensor housing to one side or the other to get this lined up. Then tighten the housing hold-down bolt/nut so that the crank angle sensor housing will not move. You have now set the static timing at 35 deg BTDC.
Ed
----- Original Message ----- From: "Finn Lassen" <finn.lassen@verizon.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, June 26, 2006 10:39 AM
Subject: [FlyRotary] Re: Timing adjustment
What may be confusing some here is the 35 BTDC static setting.
That doesn't mean that the ignition actually fires at 35 BTDC.
I believe that Tracy chose that setting to give the ECU plenty of time to receive the signal from the pickup and then calculate the actual firing time, which will vary by RPM, but be close to the yellow and red taining marks on the pulley.
Finn
Ed Anderson wrote:
Sorry, if I made it confusing, David.
Basically, I set static timing to 35 deg BTDC. I then fly with my ignition timing retarded 3.75 deg by the EC2 or at 31.25 deg BTDC. I normally use the center position as MY neutral timing position. If you punch the program control button 10 times that puts you at the most retarded timing position. Then anything lessening retard (i.e increasing advance) I make from that position. So I set the control knob to the 3 O'clock position and from the "Most Retarded" position (of the 10 positions) I punch it 5 times to get me to the "center". I do not run the engine at less than the center position (position 5). Then I have found that for my installation that if I increase it by three more clicks of the program button that gives me what I want when flying. I personally have not notice or found any benefit (in my installation) with any less that the center position. YMMV
Hope that was somewhat clearer.
Ed
----- Original Message ----- From: "David Carter" <dcarter11@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, June 24, 2006 4:05 PM
Subject: [FlyRotary] Re: Timing adjustment
Ed,
When you said, "I fly with my timing set 3 forward of the center position
which means 2 retarded or 2* 1.875=3.75."
did you mean " I fly with my timing set 3.75 retarded, i.e., 'two button pushes', i.e., 3.75 degrees from 35 degree max
static BTDC."?
In other words, I'm asking for clarification on the ". . . set 3 forward of the center position . . . " phrase. Was the "3" supposed to be "3.75"? Or is there some other physical measurement with respect to ". . . the center position . . . " of something not explicitely mentioned?
David Carter
----- Original Message ----- From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 23, 2006 1:19 PM
Subject: [FlyRotary] Re: Timing adjustment
Buly,
Last I recall, Tracy's instructions were to set the static timing at
approx 35degree BTDC for maximum advance. Then you can retard the timing
from that point using the EC2 mode 8? (Ignition Timing Adjustment mode)
for best performance. Each time you push the program store button in mode
8 it changes the timing approx 1.875 deg. There are 10 adjustments
possible for a total of 9.375 degs. Or when set at 35 deg static you
would retard the timing to a minimum of 35-9.375 deg = 25.625 deg BTDC.
I fly with my timing set 3 forward of the center position which means 2
retarded or 2* 1.875 = 3.75. Which would give me 35 - 3.75 or 31.25 degs
BTDC for normal flight.
Ed
----- Original Message ----- From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 23, 2006 2:54 PM
Subject: [FlyRotary] Timing adjustment
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