User manual MSD IGNITION PN 8388 MSD PRO-BILLET READY-TO-RUN CHRYSLER V8 DISTRIBUTOR

[. . . ] Any factor that changes the burning rate of the fuel or the engine speed can cause a need for an ignition timing change. Figure 1 shows some of the factors that will affect engine timing. FACTOR Cylinder Pressure RPM Vacuum Energy of Ignition Fuel Octane Mixture (Air/Fuel) Temperature Combustion Chamber Shape Spark Plug Location Combustion Turbulence Load Advance Timing For Low High High Low High Rich Cool Open Offset Low Light Retard Timing For High Low Low High Low Lean Hot Compact Center High Heavy Figure 1 Ignition Timing Factors. As you can see from the chart, most factors will change throughout the range of the engine operation. The timing mechanism of the distributor must make timing changes based on these factors. [. . . ] These will give you the slowest advance curve possible. The parts kit contains two additional sets of springs which can be used to match the advance curve to your particular application. Refer to the Spring Combination Chart (Figure 3) for combinations that can be achieved. To change the springs, remove the cap and rotor and use needlenose pliers to remove the springs. Be sure the new springs seat in the groove on the pin. Timing Curve From Factory SPRING COMBINATION 2- Heavy Silver 1- Heavy Silver 1- Light Blue 1-Heavy Silver 1-Light Silver 2- Light Blue 1- Light Silver 1- Light Blue 2- Light Silver RATE OF ADVANCE SLOWEST FIGURE 4 (Page 3) A B C D E FASTEST F Figure 2 The Factory Equipped Curve. Figure 3 Spring Combination Chart. Figure 4 Advance Curves. AUTOTRONIC CONTROLS CORPORATION · 1490 HENRY BRENNAN DR. , EL PASO, TEXAS 79936 · (915) 857-5200 · FAX (915) 857-3344 4 INSTALLATION INSTRUCTIONS SELECTING THE ADVANCE STOP BUSHING Three different advance stop bushings are supplied in the distributor kit. The distributor comes with a Blue (21°) bushing already installed. If a different amount of centrifugal advance is desired, follow the next procedure to change the bushings. The chart in Figure 5 gives the size and approximate degrees for the corresponding bushings. BUSHING DIAMETER Red - 0. 283" Silver - 0. 313" Blue - 0. 343" Black - 0. 375" APPROXIMATE CRANKSHAFT DEGREES 28° 25° 21° 18° Figure 5 Advance Stop Bushing Chart. CHANGING THE ADVANCE STOP BUSHINGS 1. Remove the locknut and washer on the bottom of the advance assembly (Figure 6). Remove the bushing and install the new one. Install the washer and locknut. Figure 6 Changing the Advance Stop Bushing. LOCKING OUT THE CENTRIFUGAL ADVANCE 1. Remove the advance springs, weights and the advance stop bushing from the advance assembly. Remove the roll-pin from the shaft and slide the retaining sleeve down (Figure 7). Slide the shaft two inches out of the housing. Figure 7 Removing the Retaining Sleeve. AUTOTRONIC CONTROLS CORPORATION · 1490 HENRY BRENNAN DR. , EL PASO, TEXAS 79936 · (915) 857-5200 · FAX (915) 857-3344 INSTALLATION INSTRUCTIONS 5 5. Rotate the shaft 180° and insert the advance stop bushing pin into the small hole on the advance plate (Figure 8). Install the locknut and washer to the advance stop bushing pin. Install the retaining sleeve and roll-pin. Figure 8 Locking Out the Centrifugal Advance. INSTALLING THE DISTRIBUTOR 1. Remove the existing distributor cap without disconnecting any of the spark plug wires. [. . . ] Connect the supplied wiring harness to the distributor. Route the wires to their connections as shown in Figure 10. AUTOTRONIC CONTROLS CORPORATION · 1490 HENRY BRENNAN DR. , EL PASO, TEXAS 79936 · (915) 857-5200 · FAX (915) 857-3344 6 INSTALLATION INSTRUCTIONS Figure 10 Wiring the Ready-to-Run Chrysler Distributor. Figure 11 Connecting an MSD Ignition Control. For more information, call the MSD Customer Service Line (915) 855-7123. MSD technicians are available from 8:00 a. m. [. . . ]