Early Rotary & 1979-85 Mazda RX-7 : Ignition

 : Ignition : Spark Plug - Stock BR8EQ14 12A & 13B

Spark Plug - Stock
BR8EQ14 12A & 13B

RB Part Number: 11530

NGK
BR8EQ14

Price: $10.00

Qty:

Spark Plug - Stock - BR8EQ14 12A & 13B - Detail 1

Addtional Photos - Select to Enlarge

Spark Plug - Stock
BR8EQ14 12A & 13B

For literally decades, Racing Beat has recommended NGK Spark Plugs for Street, High Performance, and Race rotary engine applications. The NGK BR8EQ14 spark plug is the Mazda factory-recommended spark plug for daily driving applications. This resistor type plug is recommended for city driving for all 1974-85 12A and 13B engines.

Specifications: NGK BR8EQ14

B= 14mm Thread Diameter
R= Resistor Type Plug
8= Heat Rating *
E= 19mm Thread reach
Q= 4-Ground Electrodes (Firing End Construction)
14= 1.4 MM (.055-inch)

Note: The use of spark plugs other than the "factory recommended" plugs requires the use of a "thin wall" socket. Installation and removal of these plugs requires the use of the Racing Beat Spark Plug Socket.

THIS PART CANNOT BE RETURNED FOR EXCHANGE OR REFUND DUE TO ITS FRAGILE NATURE AND POSSIBLE CUSTOMER MISHANDLING 

 

*A spark plug's heat range has no relationship to the actual voltage transferred though the spark plug, Rather, the heat range is a measure of the spark plug's ability to remove heat from the combustion chamber. The heat range measurement is determined by several factors; the length of the ceramic center insulator nose and its' ability to absorb and transfer combustion heat, the material composition of the insulator and center electrode material.

The insulator nose length is the distance from the firing tip of the insulator to the point where insulator meets the metal shell. Since the insulator tip is the hottest part of the spark plug, the tip temperature is a primary factor in pre-ignition and fouling. Whether the spark plugs are fitted in a lawnmower, boat, or a race car, the spark plug tip temperature must remain between 850-1500 degrees F. If the tip temperature is lower than 850 degrees F the insulator area surrounding the center electrode will not be hot enough to burn off carbon and combustion chamber deposits. These accumulated deposits can result in spark plug fouling leading to misfire. If the tip temperature is higher than 1500 degrees F the spark plug will overheat which may cause the ceramic around the center electrode to blister and the electrodes to melt. This may lead to pre-ignition /detonation and expensive engine damage.

The firing end appearance also depends on the spark plug tip temperature. There are three basic diagnostic criteria for spark plugs: good, fouled and overheated. The borderline between the fouling and optimum operating regions is called the spark plug self-cleaning temperature. The temperature at this point is where the accumulated carbon and combustion deposits are burned off.

Bearing in mind that the insulator nose length is a determining factor in the heat range of a spark plug, the longer the insulator nose, the less heat is absorbed, and the further the heat must travel into the cylinder head (rotor housings) water journals. This means the plug has a higher internal temperature, and is said to be a hot plug. A hot spark plug maintains a higher internal operating temperature to burn off oil and carbon deposits, and has no relationship to spark quality or intensity.

Conversely, a cold spark plug has a shorter insulator nose and absorbs more combustion chamber heat. This heat travels a shorter distance, and allows the plug to operate at a lower internal temperature. A colder heat range can be necessary when the engine is modified for performance, subjected to heavy loads, or is run at high RPM's for a significant period of time. The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and burn-out of the firing end. (Engine temperature can affect the spark plug's operating temperature, but not the spark plugs heat range).

The NGK heat range is from Hot (2) to Cold (10).

Reprinted from the NGK Product Catalog.

Prop65Warning

Customers who bought the above item also often bought:

Distributor Rotor - 80-85 RX-7

Distributor Rotor - 80-85 RX-7

Distributor Rotor  We offer a replacement distributor rotor for use on 1980-85 (all) electronic distributors. No longer available from Mazda as an OE part, this is a suitable aftermarket version for use with either the stock or aftermarket... »more
Price: $34.00 ADD »

Distributor Cap - 80-85 RX-7

Distributor Cap - 80-85 RX-7

We offer the genuine Mazda distributor cap for use on 1980-85 (all) electronic distributors. The Mazda part number for this cap is listed as 8245-24-310B-9U. If needed, the distributor rotor is also available. »more
Price: $57.00 ADD »

Mazda OEM Oil Filter - RX7, RX8, Protege, Miata

Mazda OEM Oil Filter - RX7, RX8, Protege, Miata

This OEM Mazda Oil Filter is intended for use on RX-7, RX-8, Protege & Protege 5, and Miata applications. It is recommended that the oil filter be replaced at the same time of an oil change. This is the genuine Mazda oil filter and is listed as part... »more
Price: $10.47 ADD »

NGK Spark Plug Wires - 71-85 RX-7 RX-3 RX-2 ALL

NGK Spark Plug Wires - 71-85 RX-7 RX-3 RX-2 ALL

NGK Wire Set 1971-85 RX-7 RX-3 RX-2 (All Models) The NGK wire set for the RX-7 offers an economical replacement for a set of old, wore wires. The NGK spark plug wire set for the RX-7 features a  7mm ultra-low resistance magnetic... »more
Price: $32.00 ADD »

Go to Racing Beat Home Page
Select: Go to Shopping Cart