Mallory Ignition ACCEL timing computer 49340 - Manual (Page 5)

1. With the engine stopped, and the Timing
Computer powered off, adjust the trigger
(distributor position, crank or mag trigger, etc.)
as close to 36° as possible.
2 . Press and hold the SAVE and VAC ADV buttons,
and apply power. The unit will display a value for
Trigger Position.
3. Use the
⇑
or
⇓
key to select 36° (For the example
we are using ), and press SAVE to store this new
value and also return to Control Mode.
Programming
Dot
C ONFIGURING M AXIMUM T IMING WITH A C RANK T RIGGER
et your ‘Rotor Phase’ to 20° BTDC (most timing curves center around this arbitrary point).
1. Rotate the engine until Cylinder-1 is at 20° BTDC .
2. Adjust the distributor so the rotor centers on Cylinder-1’s terminal.
The A CCEL T IMING C OMPUTER has a Computational Delay of 2°.
New Timing Computers come with a default trigger
configuration of 36°, for a “Maximum Timing” of 34°.
(Trigger minus 2° Computational Delay = Maximum Timing)
3. To use the factory default, adjust your crank trigger to 36°.
(36° Crank Trigger minus 2° Computational Delay = 34° Maximum Timing)
C ONFIGURING M AXIMUM T IMING WITHOUT A C RANK T RIGGER
Instead of a crank trigger use a locked distributor and
a rotor phasing kit, or an A CCEL B ILLETECH distributor.
et your ‘Rotor Phase’ to 20° BTDC (most timing curves center around this arbitrary point) .
1 . Rotate the engine until Cylinder-1 is at 20° BTDC .
2 . Adjust the rotor ( NOT the distributor body) to center on Cylinder-1’s terminal.
3 . Adjust your distributor body to match the Timing Computer’s
trigger position (i.e. 36°).
C ONFIGURING A H IGHER M AXIMUM T IMING ( for example 50° )
1. With the power off, adjust your trigger to 52°.
(52° Trigger minus 2° Computational Delay = 50° Maximum Timing)
2. With the power still off, hold down the VAC ADV and SAVE buttons, and
power-up the unit (Do not start your engine yet).
The LED display will show the current trigger configuration.
3. Push the
⇑
button until the display reads 52°
This tells the Timing Computer that the crank trigger is at 52°.
The actual Maximum Timing is 50° (52° minus Computational Delay).
4. Store this new value of 52° by pushing the SAVE button.
5. You can now power-off the unit or continue with further programming,
P ROGRAMMING YOUR T RIGGER P OSITION ( Maximum Timing - 34° )
good choice to program for trigger position is the maximum timing you’ll ever use plus 2°.