MSD 8981 Programmable Timing Computer

The MSD Programmable Timing Computer has several features in common with the pre-programmed Timing Computer. Both are adjustable for 4, 6 and 8 cylinder operation and both models have a High Speed Retard function. The difference is that the Programmable Timing Computer has an adjustable timing curve. The Programmable Timing Computer allows you to adjust the start point, rate and total amount of the advance curve to fit your application. First, the idle or initial timing must be set with the Initial Timing potentiometer. This can be adjusted up to 20� from full advance (total timing). Second, the rpm level where the timing will begin advancing needs to be set. This can be set from 1,000 to 3,000 rpm. The last adjustment is the slope or how easy you want the timing to advance. The range of adjustment for this feature is 1/2� per 1,000 rpm to 20� per 1,000 rpm. All of these timing adjustments are made with locking potentiometers located on the side of the unit.