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PN83931 Datasheet(PDF) 2 Page - Mallory performance club |
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PN83931 Datasheet(HTML) 2 Page - Mallory performance club |
2 / 8 page 2 INSTALLATION INSTRUCTIONS MSD • W W W. M S D PE R F OR M A NC E . C OM • ( 91 5 ) 8 57 - 5 20 0 • F AX ( 91 5 ) 8 57 - 33 4 4 Rev Limiter: The Ready-to-Run Distributor has a built-in rev limit that can easily be adjusted from 2,000 rpm to over 10,000 rpm. The default is 10,000 rpm. To set the rev limiter, run the engine to half the desired rpm then ground the Gray Tach wire (a jumper is supplied) for approximately one second. See page 7 for the programming procedure. CHOOSING AN ADVANCE CURVE The function of the advance curve is to match the ignition timing to the burning rate of the fuel and speed (rpm) of the engine. 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 Advance Timing Retard Timing For For C ylinder Pressure Low High Vacuum High Low Energy of Ignition Low High Fuel Octane High Low Mixture (Air/Fuel) Rich Lean Temperature Cool Hot Combustion Chamber Shape Open Compact Spark Plug Location Offset Center Combustion Turbulence Low High Load Light 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. Example: An engine has 11:1 compression with a high energy ignition. With the specifications given, you will have to retard the timing for the high compression and high energy ignition. By comparing the engine’s specifications against the chart, a usable timing guideline can be found. Engines with a combination of items from both columns will require a timing that is set in the mid range. Obviously a full technical explanation of correct ignition timing would be very complicated. The best way to arrive at a suitable ignition curve for your engine is to use the Ignition Timing Factors Chart as a guide and compare it to the Advance Graphs in Figure 4 until a suitable curve is found. When selecting your advance curve, use detonation (engine ping) as an indicator of too much advance, and a decrease in power as an indicator of too little advance. TIPS ON SELECTING AN ADVANCE CURVE • Useasmuchinitialadvanceaspossiblewithoutencounteringexcessivestarterload. • Startthecentrifugaladvancejustabovetheidlerpm. • The starting point of the centrifugal advance curve is controlled by the installed length and tension of the spring. • Howquicklythecentrifugaladvance(slope)comesiniscontrolledbythespringstiffness.The stiffer the spring, the slower the advance curve. • The amount of advance is controlled by the advance bushing.The bigger the bushing, the smaller the amount of advance. CENTRIFUGAL ADVANCE CURVE SELECTING THE ADVANCE SPRINGS The rate, or how quick the advance comes in is determined by the type of springs which are installed on the distributor. The MSD distributors are equipped with two Heavy Silver springs installed. These will give you the slowest advance curve possible (Figure 2). The parts kit contains two additional sets |
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Similar Description - PN83931 |
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