2

USER INFORMATION

CAP-A-DAPTS

When space permits, upgrading to a larger diameter magneto

cap can add extra protection against spark scatter and crossfire.

MSD offers a Cap-A-Dapt for each style Pro Mag. Each kit is sup-

plied with everything required to install the new, large cap and

rotor assembly.

Pro-Cap, PN 7455 (5" cap)

The largest cap and rotor available plus the entire assembly is

molded from strong Rynite material. Designed for MSD generators

with a four inch diameter (Figure 2).

Figure 2 Pro-Cap for Pro Mags, PN 7455.

CROSS DRIVES

Band Clamp style Pro Mag generators are equipped with cross drives due to their strength but

existing two and four pin drives will interchange. If the drive is replaced it is recommended to replace

the lock nut. Also use Blue Loctite and torque to 20 lbs-ft. Check out TechTips at www.msdpromag.

com for more information.

CRANKING RPM

MSD Pro Mags require a minimum generator speed of 200-250 RPM to start (at the crank). If a block

mounted starter is used a 16 volt battery will be required to produce reliable starting rpm. Blower

Pulley starters may require 48 volts on Alcohol applications due to pulley drive ratios. On these ap-

plications, a jumber wire should be connected across the coil terminals. Once the engine reaches

the required RPM this jumper should be pulled quickly from the terminals. MSD offers High Speed

Block mounted starters for various applications.

SPARK PLUG WIRES

MSD only recommends using our 8.5mm Super Conductor spark plug wire. This wire features

a copper-alloy conductor with a low resistance of 40 - 50 ohms per foot. The core and winding of

the conductor produce a highly effective Electro Magnetic Interference (EMI) choke so it also has

extremely high EMI suppression capabilities.

Your spark plug wires should be inspected for cuts, abrasions, resistance and continuity. It should

be noted that spark plug wire is a maintenance item of the ignition system and should be replaced

at least three times per season. Note that the coil wire should be replaced more frequently than the

entire wire set due to handling eight times the energy.

To ensure a quality crimp when building spark plug wire sets, use the MSD Pro Crimp Tool, PN 35051.

This Crimp Tool is supplied with the correct crimp dies for the 8.5mm Wire with MSD Dual Crimp Ter-

minals. The dies are also replaceable, PN 3508.

DynaForce High Speed Starters:

Ford 289, 302, 351W

- PN 50902

Ford BB 351M, 400, 429 -

PN 50922

Chevy 10 Pitch/139 Tooth -

PN 50953

Chevy 153/168 Tooth, Pro Mag

- PN 50952

(Pefect for applications with magnetos that require 250+ rpm to start.)

Chevy 318 - 440 -

PN 50982