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SPARK PŁUG OPERATING TEMPERATURES

Typical spark pług temperatures measured by thermocoupłe plugs in the Volkswagen "1200" (Uo h.p. S.A.E.) engine are shown in the graph below. (Basic timing 10° BTDC) .

Both spark pługs operate above the carbon fouling temperaturę of approximately 700° F. . . . yet, they stay below the preignition "ceil-ing" of approximately 1750° F. at maxłmum output.

Notice the Important advantages offered by the PROJECTED INSULATOR TIP typa L-87Y:

VOlKSWAOEN "1200" (40-h.p.-S.A.E.) ENGINE

MPH IOLE    20

40    60    80

V    at Iow speeds it runs

warmer than the con-ventional    pług    and

thus has    morę    foul

ing protection.

V    at fuli throttle it runs

cooler than the con-ventional    pług    and

thus has    morę    pro

tection fran overheat-ing.

2° A^e 6°    8®    10    12

OEGREES ADVANCED BEYOND BASIC SETTING

PROPER IGNITION TIMING IS IMPORTANT!

Always pay particular attention to correct igni-tion timing. If the igni-tion breaker points and distributor are not set correctly, poor performance, high fuel consump-tion, spark pług overheat-ing and even severe damage to the engine can resultl

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