Specifications

Silverstone

™

Heatrange

What is the Spark Plug Heat-range?

The heat-range identifies if a spark plug is  hot or cold. Some times a hot spark plug is

mistakenly thought to be a performance spark plug. However, just the opposite is true.

Hot or a cold just identifies the spark plugs ability to dissipate heat.

A cold spark plug dissipates heat easily, making racing and performance spark plugs usually

cold spark plugs. The colder the spark plug the more heat can be created in the combustion

chamber without overheating the spark plug. The spark plug heat-range should be lower than the

pre-ignition zone.

A hot spark plug does not dissipates heat easily, making the spark plugs for everyday use usually

hot spark plugs. Short distance driving, where the engine rarely reaches optimum operating

temperature, makes the use of hot spark plugs essential. The spark plug heat-range should be higher than the

cold fouling zone, where the spark plug never gets hot enough to clean itself. At lower temperatures,

residues from fuel and oil are not burnt away, which could lead to misfire.

A cold spark plug is for Highway driving and racing.

A hot spark plug is for prolonged idling, short distance driving and city travel.

Chuck Rayburn, National Record-Holder NHRA B/Stock Automatic,

71 Dodge Challenger 440 six-pack, 1/4 mile ET of 10.33 and 127.2 mph.

My HotWires, ProFire M80 and Silverstone plugs worked perfect....Thank You, Nology!

ITEM# TYPE SIZE (hot 4... 8 cold) HEATRANGE

120 001 010 S1K -14 mm, 0.7" reach, tapered seat, 5/8 hex 4-6

120 001 020 S2K -14 mm, 0.7" reach, tapered seat, 5/8 hex 6-8

120 001 030 S3F -14 mm, 3/4" reach, gasket, 5/8 hex 5-8

120 001 040 S5 -14 mm, 3/4" reach, gasket, 13/16 hex 5

120 001 050 S6 -14 mm, 1/2" reach, gasket, 13/16 hex 5-7

120 001 060 S7 -14 mm, 3/4" reach, gasket, 13/16 hex 6

120 001 070 S9 -14 mm, 3/4" reach, gasket, 13/16 hex 8

120 001 080 CS1K -14 mm, 0.46" reach, tapered seat, 5/8 hex 4-6

120 001 090 CS2K -14 mm, 0.46" reach, tapered seat, 5/8 hex 6-8

(Heat-Range rating is equivalent to NGK’s [hot/4.....8/cold])

THE INTELLIGENCE OF SPEED

S1K

S2K

CS1K

CS2K

S3F