Product Details
Tempest Aviation Spark Plugs – The best spark plugs at the best price
- ‘Fired in’ resistor for stable resistance value and smoother running engine
- Zero-leakage seal encloses hot, high pressure combustion gases
- Durable nickel finish offers wear and corrosion resistance
- Ceramic insulator provides high performance in severe operational conditions
- Reduced fouling and enhanced heat range control
- Available individually or save $$$ in convenient 12 packs!
Service Bulletin SB012 — Inspection and Replacement of Tempest Spark Plugs
High Conductivity Copper Core Center Electrode
Copper, co-extruded inside a nickel alloy sleeve ensures outstanding heat and electrical conductivity while the nickel sleeve offers high resistance to corrosive combustion gases.
Proprietary Glass Center Seal
21st century “fired in” resistor replaces the multipart screw, spring, and carbon pile stack up used in competitive plugs and known to suffer from resistance value instability that can cause misfires, wasted fuel, and engine roughness.
High Alumina Ceramic Insulator
High mechanical strength, superior dielectric properties, and proprietary protective glaze, provides high performance to conquer severe operational conditions. “Clean Collar” massive electrode “V” tip focuses heat to reduce fouling and enhance heat range control.
Nickel Finish
Environmentally preferable electrolytic nickel provides outstanding durable finish, superior corrosion protection, and extreme wear resistance.
Nickel Ground Electrodes
Aviation grade nickel electrode design focuses on minimizing sparking voltage requirements while maintaining specification gaps to ensure large, stable “flame kernels” for on-time ignition and complete combustion.
Vacuum Infused Center Electrode
The proprietary vacuum infusion process seals the electrode/insulator gap providing stable heat range and superior center electrode cooling (heat flow to the insulator).
Hot-Lock Assembly
Intense pressure and heat create positive, zero-leakage, shrunken in seal between insulator and shell to contain the hot, high pressure combustion cycle gases.
Harness Wire Contact
The spring contact surface is smooth, uninterrupted, oxide-treated, and corrosion resistant. It’s chemically bonded to the fired-in resistor providing the ultimate harness/spark plug termination integrity and energy transfer.
Part Number Information
Supersedes Part Numbers
EARHB32E
Cross-reference information
Cross Reference Reference only: Please verify this product is appropriate for your use case before adding to your cart. OEM Part Number McFarlane Part Number Comment EARHB32E URHB32HE
Additional product information
Approval: FAA PMA SupersedesPartNumber: EARHB32E
Product Documents
Frequently Asked Questions
What size spark plug does Tempest® manufacture?
Tempest currently manufactures only 18mm spark plugs.
What spark plug should I use for my engine?
Please refer to the Tempest application chart. There are several things you will need to know as most engines have several different spark plugs approved. You will need to know your harness B-nut size. This is the nut that screws onto the spark plug. It will be either a 5/8-24” or ¾-20 thread. Be aware that a 5/8-24 utilizes a 3/4” wrench and a ¾-20 utilizes a 7/8” wrench. Long reach v. short reach will be determined by the specific engine. Heat rating is indicated by the numeric value of the spark plug part number. The lower the numeric value the colder the heat rating. Best practice is to use the same heat rated plug you have removed. Massive electrode or fine wire is a personal choice. Massive plugs will generally operate 400-500 hours. Fine wires can last 1500 hours. This choice is usually determined by number of annual hours flown and the size and performance of the specific engine.
What Ohm value is recommended on Tempest spark plugs?
Typically Tempest spark plug resistors will stay between 1000 and 1500 Ohms throughout their life. Tempest specifies that the plug resistor should never be below 500 Ohms or above 5000 Ohms. We offer a lifetime guarantee on our fired-in resistor.
How can I check my spark plug resistor?
First, the firing end of the plug must be cleaned of lead, carbon and oil. Once cleaned you can use the Tempest AT5K® or a multi-meter. If using an AT5K please see the tool section of our website. If using a multi-meter place one lead on the center electrode and the second lead on the contact point inside the spark plug terminal well. Be sure that your multi-meter is set to the correct setting.
What is the best way to clean and gap my Tempest spark plugs?
Please visit the Technical Data portion of our website to find our articles on best cleaning practices.
What causes lead fouling on my spark plug?
Indicated by hard ash-type deposits, lead fouling can be caused by poor fuel vaporization due to cold operating temperatures or high-lead content in the fuel (misdistribution of tetraethyl lead). Lightly fouled plugs can be cleaned, re-gapped, tested and reinstalled using a new copper mounting gasket. Severely fouled plugs should be replaced with new Tempest® spark plugs.
What causes carbon fouling on my spark plug?
Carbon fouling is indicated by dry, fluffy, sooty deposits. The plug is operating too cold to burn off combustion deposits. This may be fuel related or ignition related. Fuel related causes include rich fuel mixture, faulty carburetor adjustment, excessive idling or improper idle mixture. Ignition causes could be related to a worn spark plug ignition lead, improper magneto timing or running too cold of a spark plug.
What causes oil fouling on my spark plug?
Oil fouling is indicated by oily, wet deposits and frequent misfires. Causes can include damaged pistons, worn or broken piston rings, worn valve guides, sticking valves, faulty ignition supply or an engine during break-in period.
Should I rotate my Tempest spark plugs?
Yes, you should rotate your spark plugs every 100 hours. This will help even out electrode wear caused by constant polarity and capacitance after-fire. Place them in a Tempest spark plug tray (P/N T240) and follow the rotation guide supplied on every Tempest spark plug box.
