Mallory Ignition ACCEL timing computer 49340 - Manual (Page 8)

A DJUSTING YOUR I GNITION T IMING TO P ROPER S PECIFICATIONS
1 . Start your engine and then press the T IMING and VAC ADV keys.
The Timing Computer displays the number of degrees BTDC ignition timing.
2 . Use the ⇑ and ⇓ keys to select one of the engine timing marks as a value.
Your Timing Computer will use this fixed ignition timing, regardless of
engine speed or other inputs.
3 . Make fine adjustments to your trigger input, with a Timing Light,
so it matches the value on the Timing Computer’s display.
4 . Return the display to Control Mode by pressing the T IMING button twice.
R EV - LIMITING WITH THE T IMING C OMPUTER
our A CCEL + ignition has the final say in rev-limiting, but there are ways you can use
he Timing Computer to rev-limit at a lower engine speed than what has been set in the
gnition box. One way is to retard timing by 10° – 15° at your chosen engine speed, as
hown on Page 7. Another way is program a rev-limit with the Accel Timing Computer.
1 . Press the RPM and VAC ADV keys to get into Programming Mode.
The current value for rev-limit will display.
2 . Use the ⇑ and ⇓ keys to adjust this value in 100 RPM increments.
(Note: Your A CCEL + ignition rev-limits in 250 RPM increments.)
3 . Press the RPM button twice, to return to Control Mode, and then press SAVE.
C ONFIGURING WITHOUT A MAP S ENSOR
lthough we do recommend a MAP Sensor, you can operate without one. For best results
se Magnetic Triggering, or a Points Distributor with mechanical advance locked out.
o not adjust or remove the Vacuum Advance mechanism on the distributor.
1. Program your Base Timing Curve as described on Pg 6.
2. Set VAC ADV and B OOST R ETARD both to 0°.
3. Press SAVE to store all new values.
U SING THE DISPLAY AS A D IGITAL T ACHOMETER
ou can make your Timing Computer display engine RPM by simultaneously pressing
oth the RPM and T IMING keys. It will continue displaying as a digital tachometer until
ou enter Programming Mode. When you exit from Programming Mode the LED’s will
nce again display engine timing.
R ESTORING THE F ACTORY D EFAULT S ETTING
ou may decide, for one reason or another (such as replacing a major engine component)
o restore the Timing Computer’s original Factory Defaults. To restore Factory Defaults:
1 . Turn the power OFF .
2 . Press and hold down SAVE and B OOST R ETARD and apply the power.
When the display reads 1 2 3 0 0 release both keys.
F ACTORY SETTINGS : a default timing curve, no adjustment for additional inputs,
RPM Activated Switch-1 set at 4,500 RPM , Switch-2 set at 6,500 RPM ,
no rev-limit, Cylinders = 8, Trigger Position set to 36° BTDC.