Msd Secrets to Successfully Using an MSD Magnetic and Manual de usuario descargar pdf

Secrets to Successfully Using

an MSD Magnetic and

Non-Magnetic Pickup

MSD’s Tech Bulletins are designed to give you a more in-depth

understanding of the ignition system and its components. If you have any other questions about the

subject or MSD products you can contact our Customer Support Department at (915) 855-7123 or

email your questions to [email protected].

# 109

Every ignition system requires a trigger signal to accurately ﬁre and deliver a high voltage spark from the coil. There

are several ways this is achieved, from mechanical breaker points to magnetic pickups, optical triggers and other elec-

tronic switches which all serve the same function; to accurately trigger the ignition at the correct moment for the ideal

spark timing.

MSD Ignition incorporates a magnetic pickup in our distributors because of their reliability and accuracy. In fact, most

major automotive manufacturers used magnetic pickups in their distributors until the advent of distributorless ignition

systems in late model vehicles. (For MSD’s Flying Magnet Crank Trigger systems, a non-magnetic pickup is used. This

pickup functions in a similar manner as the magnetic pickup which will be explained below.)

This bulletin provides an explanation as to the operation of a magnetic pickup and non-magnetic pickup, their polarity

and testing along with a few helpful installation tips.

Secrets to Successfully Using

an MSD Magnetic and

Non-Magnetic Pickup

Figure 2 - MSD Flying Magnet Crank Trigger.

Theory – How Does It Work?

The magnetic pickup is actually a wire that is wound around

a magnet to create a magnetic ﬁeld. Whenever this ﬁeld

changes, due to another metal object coming into the ﬁeld,

a voltage is generated. MSD uses this voltage as a trigger

signal for the ignition control.

An MSD Distributor incorporates a metal reluctor wheel

with eight evenly spaced trigger tabs (six for 6-cylinder en-

gines, four on 4-cylinders). This reluctor is mounted to the

distributor shaft (Figure1). Each time one of these reluctor

tabs passes the magnetic pickup, a trigger signal is created

which ﬁres the MSD Ignition.

Conversely, an MSD Flying Magnet Crank Trigger system

uses a non-magnetic pickup. The pickup consists of a wire

that is wound around an iron core rather than a magnet. To

create the voltage for the trigger signal, a magnet must pass

the pickup rather than a metal post (Figure 2). MSD uses this

design because we have the capability to install magnets in

a crankshaft mounted wheel and the pickup cannot be trig-

gered by anything other than the magnet so there are no

chances of false triggering.

Though these two pickups require different trigger sources,

they essentially function in the same manner and share the

same wiring and installation tips.

Figure 1 - MSD Pro-Billet Distributor.

RELUCTOR

TRIGGER TABS

MAGNETIC

PICKUP

TRIGGER

MAGNET

NON-MAGNETIC

PICKUP

T ech Bulletin

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Indice de contenidos

Pagina 1 - T ech Bulletin

Secrets to Successfully Using an MSD Magnetic and Non-Magnetic Pickup MSD’s Tech Bulletins are designed to give you a more in-depth underst

Pagina 2 - POLARITY

Polarity These pickups can only be connected one way to operate correctly so it is important to know the polarity of the wires. The magnetic pickup

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