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PN8504 Datasheet(PDF) 2 Page - Mallory performance club |
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PN8504 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 Figure 2 Ignition Timing Factors. Note: It is recommended to have a dial-back timing light, timing tape or a fully degreed balancer to set the timing correctly. CHOOSING AN ADVANCE CURVE The function of the advance curve is to match the ignition timing to the burning rate of the fuel with the speed (rpm) of the engine. The piston is traveling much faster through the combustion stroke at 5,000 rpm compared to 1,000 rpm. Any factor that changes the burning rate of the fuel or the engine speed can cause a need for an ignition timing change. Figure 2 shows some of the factors that will affect engine timing. FACTOR Advance Timing Retard Timing For For Cylinder 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 As you can see from the chart, most factors will change throughout the range of the engine operation. The Digital E-Curve allows you to make timing changes based on these factors. Example: An engine has 11:1 compression, a high energy ignition and turns 5,500 rpm. 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 3 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. Also consider how the engine cranks and starts. Too much advance can cause an engine to crank slow or even kick back. Here are a couple of suggestions. • Useasmuchinitialadvanceaspossiblewithoutencounteringexcessivestarterload. • Starttheelectricaladvancejustabovetheidlerpm. • Selectanadvancecurvethatproducesgoodaccelerationwithoutdetonation. |
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