MSD 6201 User Manual

INSTALLATION INSTRUCTIONS

MSD Digital 6A and 6AL Ignition Control

6A - PN 6201, 6AL - PN 6425

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Parts Included:

1 - MSD Ignition 1 - Harness, PN 8860 1 - Mag Pickup

WARNING: During installation, disconnect the battery cables. When disconnecting the battery always

remove the Negative cable ﬁrst and install it last.

1 - Main Harness 1 - Parts Bag

6AL ONLY

4 - Vibration Mounts 1 - Screwdriver

Note:

Note: If you're triggering an aftermarket EFI system with the Gray wire of the MSD, see page 4 to

Important: When installing a Digital Series Ignition, timing will be affected, reset to your engine's

The Carb label supplied is required to aid in passing the California Smog Check program. This label must be installed in an underhood location that is readily visible.

deactivate the tach veriﬁcation feature.

speciﬁcations.

OPERATION AND FEATURES

DIGITAL OPERATION

The Digital 6A and 6AL use a high speed RISC microcontroller to control the ignition's output while constantly analyzing the various inputs such as supply voltage, trigger signals and rpm. The high speed controller can make extremely quick compensations to the output voltage, multiple spark series, timing and rpm limits while maintaining precise timing and accurate rev limiting. The circuits and controller of the MSD have been thoroughly ﬁltered to create protection against Electro Magnetic Interference (EMI).

CAPACITIVE DISCHARGE

The Digital 6A and 6AL feature a capacitive discharge ignition design. The majority of stock ignition systems are inductive ignitions. In an inductive ignition, the coil must store and step up the voltage to maximum strength in between each ﬁring. At higher rpm, since there is less time to charge the coil to full capacity, the voltage falls short of reaching maximum energy which results in a loss of power or top end miss.

The MSD Ignition features a capacitor which is quickly charged with 520 - 535 volts and stores it until the ignition is triggered. With the CD design, the voltage sent to the coil positive terminal is always at full power even at high rpm.

MULTIPLE SPARKS

The MSD produces full power multiple sparks for each ﬁring of a plug. The number of multiple sparks that occur decreases as rpm increases, however the spark series always lasts for 20° of crankshaft rotation. Above 3,000 rpm there is simply not enough “time” to ﬁre the spark plug more than once, so there is only one powerful spark.

PROTECTION

The Digital 6A and 6AL have a built in reverse polarity protection circuit. This will protect the ignition in the event of wrong connections.

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INSTALLATION INSTRUCTIONS

LED INDICATOR

There is an LED that monitors the status of the Ignition. When the key is turned On, without starting the engine, the LED will momentarily turn on and then turn off. When running, the LED will ﬂash with each trigger signal which will make it appear to be on steady as rpm increases.

Note: Solid Core spark plug wires cannot be used with an MSD Ignition. Note: Do not use digital or dial back timing lights.

REV LIMITER

The Digital 6AL features a built-in Soft Touch Rev Control that provides a smooth and accurate rev limit by dropping the spark to individual cylinders. The Soft Touch produces a load-free rev limit that is within 1% of the selected rpm.The rpm limit is adjusted in 100 rpm increments with the sealed rotary switches under the black cover on top of the 6AL.

CYLINDER SELECT

The MSD is programmed at the factory for use on 8-cylinder engines. If you are installing it to a different engine you will have to program the Ignition. This is easily achieved through the cylinder select wire loops on the side of the ignition. Page 5 outlines setting the cylinder select.

GENERAL INFORMATION

BATTERY

The Digital 6A and 6AL will operate on any negative ground, 12 volt electrical system with a distributor. The MSD can be used with 16 volt batteries and can withstand a momentary 24 volts in case of jump starts. The Ignition will deliver full voltage with a supply of 9 - 18 volts.

If your application does not use an alternator, allow at least 15 amp/hour for every half hour of operation. The MSD uses about .9 Amps for every 1,000 rpm. If the engine is cranked with the same battery or other accessories such as an electric fuel or water pump are used, the amp/hour rating should be higher.

COILS

The Digital 6A and 6AL Ignition can be used with most stock coils and aftermarket coils designed to replace the stock coils. The line of MSD Blaster Coils are great for street and mild racing. For extended high rpm operation the Blaster HVC, PN 8252 or HVC II, PN 8253, are recommended. For more information on recommended coils, check with our Customer Service Department at (915) 855-7123.

TACHOMETERS

The MSD Ignition features a Gray Tach Output wire that provides a trigger signal for tachometers, a shift light or other add-on rpm activated devices. The Tach Output wire produces a 12 volt square wave signal with a 22.5° duty cycle.

Some vehicles with factory tachometers may require a Tach Adapter to operate with the MSD. For more information on Tachometers and MSD Tach Adapters, see the Tachometer Section on page 6. If your GM vehicle has an in-line ﬁlter it may cause the tach to drop to zero on acceleration. If this occurs, bypass the ﬁlter.

SPARK PLUGS AND WIRES

Spark plug wires are very important to the operation of your ignition system. A good quality, helically wound wire and proper routing are required to get the best performance from your ignition, such as the MSD 8.5mm Super Conductor Wire. Helically wound wires provide a good path for the spark to follow while keeping Electro Magnetic Interference (EMI) to a minimum. Excessive EMI, such as the amount that solid core wires produce, will interfere with the operation of the MSD. Solid Core spark plug wires

cannot be used with an MSD Ignition.

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INSTALLATION INSTRUCTIONS

Routing: Correct routing of the plug wires is also important to performance. Wires should be routed away from sharp edges and engine heat sources. If there are two wires that are next to each other in the engine’s ﬁring order, the wires should be routed away from each other to avoid inducing a spark into the other wire. For example, in a Chevy V8, the ﬁring order is 1-8-4-3-6-5-7-2. The #5 and #7 cylinders are next to each other in the engine and in the ﬁring order. If the voltage from the #5 wire is induced into #7 detonation could occur and cause engine damage. To add more heat protection to your plug wires, MSD offers Pro-Heat Guard, PN 3411. This is a glass woven and silicone coated protective sleeve that you slide over your plug wires. For extra protection of the spark plug boots, MSD offers Pro Boot Guard, PN 3412.

Spark Plugs: Choosing the correct spark plug design and heat range is important when trying to get the best performance possible. Since there are so many engine combinations and manufacturers, MSD does not recommend which plug or gap is exactly right for your application. It is recommended to follow the engine builder or manufacturer’s speciﬁcation for spark plugs. With that, you can then experiment with the plug gap to obtain the best performance. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. MSD judges the plug gap by compression and components.

These examples are just starting points to get you going in the right direction. Every application is different and should be tested and tuned.

Compression Spark Plug Gap Up to 10.5:1: 0.050" - 0.060"

10.5:1 - 13.0:1: 0.040" - 0.050" Above 13.0:1: 0.035" - 0.045"

Welding: If you are welding on your vehicle, to avoid the chance of damage, always disconnect both Heavy Power cables of the MSD (You should also disconnect the tach ground wire too).

Distributor Cap and Rotor: It is recommended to install a new distributor cap and rotor when installing the MSD Ignition Control. The cap should be clean inside and out especially the terminals and rotor tip. On vehicles with smaller caps, it is possible for the air inside the cap to become electrically charged causing crossﬁre which can result in misﬁre. This can be prevented by drilling a couple vent holes in the cap. The holes should be placed between the terminals, at rotor height and face away from the intake. If your environment demands it, place a small piece of screen over the hole to act as a ﬁlter.

MOUNTING

The MSD can be mounted in the engine compartment as long as it is away from direct engine heat sources. It is not recommended to mount the unit in an enclosed area such as the glove box. When you ﬁnd a suitable location to mount the unit, make sure the wires of the ignition reach their connections. Also be sure that the program dials can be accessed. Hold the Ignition in place and mark the location of the mounting holes. Use a 3/16" bit to drill holes, install the vibration mounts and mount the ignition.

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INSTALLATION INSTRUCTIONS

WIRING

The Digital 6A and 6AL use a main wiring harness that connects to the ignition through a sealed and locked connection.

Power Leads

Heavy Red

Heavy Black

Red

Orange

Black

Trigger Wires

White

Violet and Green (Magnetic Pickup Connector)

These are the two heavy 12 gauge wires and are responsible for getting direct battery voltage to the ignition. The Ignition is load protected from reverse battery connections.

This wire connects directly to the battery positive (+) terminal or a positive battery junction such as the starter solenoid. Note: Do not connect to the alternator.

This wire connects to a good ground, either at the battery negative (-) terminal or to the engine.

This wire is responsible for turning the MSD On and Off. Connects to a switched 12 volt source such as the ignition key or switch. (Max current draw of .250 mA.)

This wire connects to the coil positive (+) terminal. This is the ONLY wire that makes electrical contact with the positive coil terminal.

This wire connects to the coil negative (-) terminal. This is the ONLY wire that makes electrical contact with the negative coil terminal.

There are two circuits that can be used to trigger the MSD Ignition; a Points circuit (the White wire) and a Magnetic Pickup circuit (the Green and Violet wires). Only one circuit will be used at a time.

This wire is used to connect to breaker points, electronic ignition ampliﬁer output or to the Yellow wire of an MSD Timing Accessory.

When this wire is used, the Magnetic Pickup connector is not used.

These wires are routed together in one harness as the magnetic pickup connector. The connector plugs directly into an MSD distributor or crank trigger. It will also connect to aftermarket pickups. The Violet wire is positive (+) and the Green wire is negative (-). When these

wires are used, the White wire is not.

Accessories

Gray

Red Loop Blue Loop

Tach output wire. Connects to the tachometer trigger wire or other rpm activated device.

These are the cylinder-select wire loops. Cut one loop for even-ﬁre 6-cylinders, two loops for 4-cylinders.

GENERAL WIRING INFORMATION

Wire Length: All of the wires of the MSD Ignition may be shortened as long as quality connectors are used or soldered in place. To lengthen the wires, use one size bigger gauge wire (12 gauge for the power leads and 16 gauge for the other wires) with the proper connections. All connections must be soldered and sealed.

Grounds: A poor ground connection can cause many frustrating problems. When a wire is speciﬁed to go to ground, it should be connected to the battery negative terminal, engine block or chassis. There should always be a ground strap between the engine and the chassis. Always securely connect the ground wire to a clean, paint free metal surface.

Ballast Resistor: If your vehicle has a ballast resistor in-line with the coil wiring, it is recommended to bypass it.

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INSTALLATION INSTRUCTIONS

AL 6AL

Routing Wires: The MSD wires should be routed away from direct heat sources such as exhaust manifolds and headers and any sharp edges. The trigger wires should be routed separate from the other wires and spark plug wires. It is best if they are routed along a ground plane such as the block or ﬁrewall which creates an electrical shield. The magnetic pickup wires should always be routed separately and should be twisted together to help reduce extraneous interference.

PROGRAMMING

CYLINDER SELECT

The MSD is programmed for operation on 8-cylinder engines. If installing the Ignition on a different style engine, the number of cylinders will need to be selected by cutting the cylinder select wire loops as shown in Figure 1.

REV LIMITER

The rev limiter can be set from 2,000 to 11,000 rpm. To adjust the rev limiter of the Digital 6AL, remove the black cover next to the LED by prying up with the supplied screwdriver. The dial on the left is for 1,000 rpm increments, on the right is for 100 rpm increments.

CYLINDERS WIRE LOOPS 8 No Cut Loops

6 Cut One Loop 4 Cut Both Loops

REV

LIMITER

DIGIT

For a rev limiter in the 10,000 range, set the dials as they would be for any other RPM but the left dial will use '0'. To

Figure 1 Programming the Number of

Cylinders.

set the rev limiter to 11,000 rpm, put the left dial to '1' and the right dial to '0'. Setting both rotary dials to '1' will activate a special function explained below. Note: The engine can be running as you make adjustments

to the rev limiter function.

REV LIMITER VERIFICATION

The MSD Digital 6AL has an optional built in Rev Limiter Veriﬁcation feature. When the key is in the On position (not cranking or running), an rpm signal is sent to the tachometer to verify the unit's rev limit setting. With this

1,000's

function users can be sure of their rev limit settings before each drive.This feature is not activated from the factory. To enable this feature, follow the procedure below. Note: It is important to note that this feature should not

Figure 2 Adjusting the Rev Limits.

be used with EFI systems. When activated, an rpm signal is sent to the tachometer. With an aftermarket EFI system, this could activate the injectors causing a ﬂooding situation.

Enable Rev Limit Veriﬁcation

1. With the ignition switch in the off position, ground the Gray tach output wire.

2. With the Gray wire connected to ground, turn on power to the ignition without starting the engine.

3. Hold the Gray tach output wire to ground for seven seconds. (AT LEAST ﬁve seconds.)

4. Release the wire from ground before ten seconds have passed.

5. To conﬁrm the process has worked, cycle turn the key On. The tachometer should sweep to the rpm limit set on the ignition.

100's

As soon as this process is complete the feature will be activated. The Digital 6AL uses the red LED to help indicate when an adequate amount of time has passed to release the Gray tach wire. The LED will turn on after the wire has been grounded for ﬁve seconds and will turn off at the 10 second mark. To deactivate the feature again, repeat the same process.

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Playback Tach: If you use a playback tach, be sure to check the high rpm value prior to turning the key to the On position. When the key is in the On position, the rev limit will be displayed and may override the tach memory.

INSTALLATION INSTRUCTIONS

CONNECTING THE DIGITAL 6AL WITH THE MSD POWER GRID SYSTEM CONTROLLER, PN 7730

A wiring diagram to connect the MSD Power Grid System Controller to a 6AL can be found in the instructions for the System Controller, PN 7730. A special rev limit must be selected when connecting to the Power Grid. This setting is (1 / 1), meaning to put both dials on 1. With the Digital 6AL's Rev Limit Rotary Dials both set to one, the box programming will change to accept the Power Grid.

Note: Under no other conditions should the rotary dials be set to (1 / 1); this could cause severe

issued with how the box reads the input signal. Similarly, using the System Controller when the 6AL is not set to 1 / 1 will cause issues that could result in engine damage.

Note: The 6A, PN 6201, is not compatible with the Power Grid Controller.

PRESTART CHECK LIST

• The only wires connected to the coil terminals are the MSD Orange to coil positive and Black to coil negative.

• The small Red wire of the MSD is connected to a switched 12 volt source.

• The MSD power leads are connected directly to the battery positive and negative terminals.

• The battery is connected and fully charged if not using an alternator.

• The engine is equipped with at least one ground strap to the chassis.

• If you are installing on a 4 or 6-cylinder engine, conﬁrm the programming loops have been modiﬁed, see page 5.

THEFT DETERRENT

The MSD provides the opportunity to easily install a theft deterrent kill switch (Figure 3).

White Wire Trigger

When using the WHITE wire to trigger the MSD, install a switch across the magnetic pickup VIOLET wire to ground. When the VIOLET wire is grounded, the vehicle will crank but not start.

Figure 3 Connecting a Theft Deterrent Switch Through the MSD Ignition.

Magnetic Pickup Trigger

When using the mag pickup to trigger the MSD, install a switch to the WHITE wire and the other side to ground. When the WHITE wire is grounded, the vehicle will crank but will not start.

TROUBLESHOOTING

Every MSD Ignition undergoes numerous quality control checks including a four hour burn-in test. If you experience a problem with your MSD, our research has shown that the majority of problems are due to improper installation or poor connections. The Troubleshooting section has several checks and tests you can perform to ensure proper installation and operation of the MSD. If you have any questions concerning your MSD, call our Customer Support Department at (915) 855-7123, 7 - 5 mountain time.

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