CHAMPION M40J Spark Plugs

( Brand: Champion ), ( Manufacturer Part Number: M40J ), ( Type: Spark Plug ), ( Material: Copper ), ( Country/region Of Manufacture: United States )

Review CHAMPION Spark Plugs New

Champion M40J spark plugs are a high-performance solution for automotive and racing applications. These plugs are designed to deliver reliable ignition in various engine conditions, making them an excellent choice for both daily drivers and high-performance vehicles.

The M40J spark plug features a central electrode made of 10.5mm iridium, a noble metal known for its excellent durability and resistance to wear. The iridium tip ensures a precise spark, even under heavy loads or high RPMs. The side electrode is made of nickel alloy, which provides excellent conductivity and durability.

These spark plugs also come with a copper core insulator, which helps to prevent fouling and ensures efficient heat transfer. The insulator also has a porcelain shell, which provides excellent insulation and resistance to thermal shock.

The M40J spark plugs have a heat range of H7, which provides optimal performance for most gasoline engines. They are designed to resist fouling, pre-ignition, and deterministic knocking, ensuring a stable and efficient combustion process.

Each spark plug comes with a high-temperature ceramic seal, which prevents fuel and combustion gases from leaking into the cooling system. The plugs also have a long insulator nose, which provides clearance for valves and other engine components.

Champion M40J spark plugs are available in a variety of thread sizes to fit a wide range of engines. They are easy to install, and the iridium tip does not require pre-gapping. The plugs also come with a protective boot to prevent damage during installation and removal.

Overall, Champion M40J spark plugs are a high-quality and reliable solution for anyone looking to improve their engine performance. They offer excellent durability, precise ignition, and efficient heat transfer, making them an excellent choice for both daily driving and racing applications.

Champion M40J spark plugs are a popular choice for high performance and racing applications due to their advanced design and features. Here are some pros and cons to consider before making a purchase:

1. Advanced Design: The Champion M40J spark plugs feature a multi-granule electrode design that provides fast ignition and improved combustion efficiency.

2. Longer Life: The longer insulator nose and reinforced insulator material help to increase the lifespan of these spark plugs.

3. Copper and Iridium Alloy Center Electrode: The use of copper and iridium alloy in the center electrode provides excellent conductivity and durability.

4. Resists Fouling: The Champion M40J spark plugs are designed to resist fouling and prevent carbon build-up, which helps to maintain optimal engine performance.

5. Wide Application: These spark plugs are suitable for a wide range of applications, including gasoline and diesel engines, and are commonly used in high-performance and racing applications.

1. Cost: The Champion M40J spark plugs are more expensive than standard spark plugs due to their advanced design and materials.

2. Requires Specific Ignition System: These spark plugs require a specific ignition system to operate effectively, which may not be available on all vehicles.

3. Installation: Installing these spark plugs may require specialized tools and knowledge, which may add to the overall cost of ownership.

Champion M40J spark plugs offer several advantages for high-performance and racing applications, including fast ignition, improved combustion efficiency, longer lifespan, and resistance to fouling. However, they come with a higher cost and may require a specific ignition system and specialized tools for installation.

If you are looking for a high-performance spark plug for your racing or high-performance application, the Champion M40J spark plugs are an excellent choice due to their advanced design and features. However, be prepared for the higher cost and potential installation challenges. If you are looking for a more affordable option, consider standard spark plugs.

Details:

I ship by USPS GROUND ADVANTAGE and only with the CONTINENTAL USA. Please zoom in to check for more detail. Please zoom in to see the condition of spark plugs. These M40J Aircraft Champion spark plugs are new old stock.

I am told these are used for small aircraft engines. From what I can tell the plugs look fine, but original packaging definitely shows age of being stored to a long time. They have been safely stored in a heated garage and are still their original packaging. This was part of my husbands extensive aircraft parts collection.

I have 7 available for sale, but I m thinking there must be an 8th one somewhere. IF there possibly is an 8th one, I will include it with the sale price, but cannot guarantee that exists.

part #: m40j prices

• $14.98-$59.90

specifications aviationpar:

• brand: Champion
• mpn: M40j
• type: Spark Plug
• material: Copper
• country/region of manufacture: United States

offer aviationpar:

• availability: In Stock
• quantity: 7
• started: June 8, 2025
• options: Ship-to-home
• sold: 0

shipping aviationpar:

• type: Fixed
• service: USPS Ground Advantage
• transit: 5-10 Days
• carrier: USPS
• cost: $12.99
• class: Standard

seller aviationpar:

• # reviews: 48
• city: Reynoldsburg, Ohio
• rating: 100.0%

returns aviationpar:

• policy: No Returns

general aviationpar:

• Parts Accessories > Aviation Parts Accessories > Parts
• condition: New other see details

payments aviationpar:

• wallet: Apple-pay
• other
• credit card: Visa

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