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  • Correct Mounting

Correct Mounting

Spark Plugs are constructed by using two different manners of sealing in the cylinder head.

METHODS OF SPARK PLUG SEALING

Conical Seat
Conical Seat
Spark plug is sealed in cylinder head with a conical seat. In this case no sealing washer is used. The assembly of spark plugs with this kind of sealing requires an especially sensitive approach. If the torque is exceeded, the spark plug shell can be stretched, thermal characteristics can be lost and there may even occur a rupture of the spark plug during its assembly or dismantling in the engine.
Sealing with a washer
Sealing with a Washer
Spark plugs can never be mounted into cylinder head without a sealing washer. In such a case the combustion area is not sealed sufficiently and heat removal into cylinder head does not work well enough.


INSTALLING SPARK PLUGS WITHOUT USING A TORQUE WRENCH

GASKET (WASHER) SEAT

New Spark Plug

Old Spark Plug

CONICAL (TAPERED) SEAT

New Spark Plug

Old Spark Plug


INSTALLING SPARK PLUGS USING A TORQUE WRENCH

SPARK PLUG TORQUE SPECS CHART (FT.LB)

Spark Plug

Head of Engine

plug sizes

seals

cast - iron

aluminum

M 10 x 1

sealing ring (gasket)

7.2-10.8 ft.lb

7.2-8.7 ft.lb

M 12 x 1,25

sealing ring (gasket)

10.8-18 ft.lb

10.8-14.5 ft.lb

M 14 x 1,25

sealing ring (gasket)

18-25.3 ft.lb

18-21.6 ft.lb

M 14 x 1,25

conical seat (tapered)

10.8-18 ft.lb

7.2-14.5 ft.lb

M 18 x 1,5

conical seat (tapered)

14.5-21.6 ft.lb

14.5-21.6 ft.lb

SPARK PLUG TORQUE SPECS CHART (IN.LB)

Spark Plug

Head of Engine

plug sizes

seals

cast - iron

aluminum

M 10 x 1

sealing ring (gasket)

86-130 in.lb

86-104 in.lb

M 12 x 1,25

sealing ring (gasket)

130-216 in.lb

130-174 in.lb

M 14 x 1,25

sealing ring (gasket)

216-304 in.lb

216-259 in.lb

M 14 x 1,25

conical seat (tapered)

130-216 in.lb

87-174 in.lb

M 18 x 1,5

conical seat (tapered)

174-259 in.lb

174-259 in.lb

SPARK PLUG TORQUE SPECS CHART (Nm)

Spark Plug

Head of Engine

plug sizes

seals

cast - iron

aluminum

M 10 x 1

sealing ring (gasket)

10-15 Nm

10-15 Nm

M 12 x 1,25

sealing ring (gasket)

15-20 Nm

15-20 Nm

M 14 x 1,25

sealing ring (gasket)

20-40 Nm

20-30 Nm

M 14 x 1,25

conical seat (tapered)

10-20 Nm

10-20 Nm

M 18 x 1,5

conical seat (tapered)

20-30 Nm

20-30 Nm


SELECTION OF PROPER SPARK PLUGS

HEAT RANGE

Vehicles produced in series (which are not additionally modified for engine power output enhancement), whose engines are properly adjusted and in good technical condition, can be equipped according to the current application tables.

Any comparison charts of spark plugs are always for informative purposes only and they do not substitute the current application tables in full.

In the case of engine power output enhancement by means of additional modifications it is suitable to contact a producer's representative. There always applies a principle that in the case of medium modifications of the power output it is suitable to use the spark plugs "colder" by 2 degrees than those forming its original equipment (e.g. a change from 15 to 12). After driving several miles and subsequent assessment of the insulator tip appearance it is possible to decide about the most suitable equipment. This operation requires enough experience.

PROPER LENGTH OF THE THREADED SHELL

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Contact Brisk Racing

Location

4550 FM 1960 Road East, Ste C
Humble, Texas 77346

Contact

Phone: (713) 459-6977
Fax: (866) 583-6239

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