Msd ROTOR PHASING Tech Bulletin Bedienungsanleitung PDF herunterladen

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].

T ech Bulletin

Rotor Phasing

Rotor Phasing is deﬁned as the alignment between the rotor tip and the distributor cap terminal when the spark oc-

curs. This position can be very important to your engine’s performance. If the alignment is incorrect, the spark will jump

to the next closest terminal or another ground resulting in a misﬁre and loss of Power.

On engines with extreme cylinder pressures, such as nitrous and supercharged applications, correct rotor phasing

increases in importance. More voltage is required to ionize the plug gap and if the phasing is off, the spark is more apt

to ﬁnd an easier path to ground rather than the correct cap terminal. This may result in severe engine damage.

Checking Rotor Phasing

To check rotor phasing, you’ll have to modify a distribu-

tor cap so you can observe the rotor tip with a timing light

when the engine is running. Drill a large hole into a cap near

a terminal that will allow you an easy view of the terminal

(Figure 1).

To help see the rotor tip you may want to mark it with white

correction ﬂuid. With your modiﬁed cap installed, connect the

timing light’s inductive lead to the corresponding plug wire.

Start the engine and run at a steady speed. Shine the timing

light in the modiﬁed cap and note the relation of the rotor tip

and the terminal when the spark jumps (Figure 2).

Figure 1 - Examples of modiﬁed distributor caps.

ROTOR PHASING

Figure 2 - Drill a hole in a cap to view the location of the rotor

tip with one of the cap terminals.

Figure 3 - The rotor tip should align with the cap

terminal when the spark occurs.

Note: MSD recommends using a non-dial back timing

light for best timing results.

No Vacuum Advance: The rotor tip should line up with the cap termi-

nal or be on the leading edge of the terminal when the spark occurs

(Figure 3). This ensures that the spark is jumping to the correct cylinder

at the proper time.

frm28392_tech_bulletin_rotor_pha1 1 2/20/2007 9:45:55 AM

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Seite 1 - T ech Bulletin

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 oth

Seite 2 - Preventative Maintenance

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Msd ROTOR PHASING Tech Bulletin Bedienungsanleitung

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