Mallory Ignition ACCEL timing computer 49340 User 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°.