PN8485 Datasheet, PDF (1/8 Pages) Mallory performance club – MSD Billet VW Distributor

MSD Billet VW Distributor
PN 8485
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Important:  Read these instructions before attempting the installation.
Parts Included:
1- Billet Distributor
2 - #10 Disc Washers
3 - Advance Stops
1 - Retaining Nut
7 - Shims
1 - Clamp Stud
4 - Advance Springs
1 - Hold Down Bracket
2 - O-Rings
TIMING FUNCTIONS
Before continuing with the installation, here are a few definitions you should be aware of:
Initial Timing: This is the base timing of the engine before centrifugal advance begins.
Centrifugal Advance: The centrifugal advance mechanism is made up of weights, springs, advance
cam, and an advance stop bushing. The amount and rate of advance that your distributor is capable
of is determined by the centrifugal timing. If you ever wish to lock out the centrifugal advance, refer
to the centrifugal advance section.
Total Timing: This is the total of the initial timing plus the centrifugal advance added together. Example:
10° Initial + 25° centrifugal = 35° Total Timing.
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.
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