Description
Product Overview
The Moroso Ultra 40 Race Wire set is engineered for high‑performance automotive applications where precise spark timing is critical. Featuring 8.65mm diameter conductors, each foot of wire maintains a stable 40 ohms resistance, ensuring consistent voltage delivery to every spark plug. Constructed from premium, heat‑resistant alloy, the wire resists degradation under extreme engine temperatures, providing long‑term reliability. The set includes individually labeled wires for each cylinder, simplifying installation and reducing the risk of misrouting.
Usage

Designed for race cars, performance street builds, and high‑output street engines, this wire set excels in environments that demand rapid throttle response and maximum power output. Ideal for enthusiasts upgrading their ignition system, professional race teams, and mechanics performing engine rebuilds, the Moroso Ultra 40 ensures optimal spark plug performance across a wide range of displacement and cylinder configurations.
Why Choose Us
Moroso’s reputation for Italian design and engineering excellence translates into a spark plug wire set that combines durability, precision, and ease of use. Each wire undergoes rigorous testing for resistance consistency, heat tolerance, and electromagnetic interference shielding. The labeled wires eliminate guesswork during installation, saving time and preventing costly errors. Backed by Moroso’s quality guarantee, this set offers peace of mind for demanding applications.
Key Features
- 8.65mm diameter conductors provide robust current capacity.
- Consistent 40 ohms per foot resistance for uniform spark delivery.
- Heat‑resistant alloy construction withstands extreme engine temperatures.
- Each cylinder wire is clearly labeled for fast, error‑free installation.
- Race‑proven performance suitable for both track and high‑output street use.
FAQ
What engines are compatible with the Ultra 40 Race Wire set?
The set is designed for a wide range of gasoline engines, from small‑displacement sport cars to large V8 and V12 performance engines. It works with any application that requires standard spark plug wire dimensions and 40 ohms per foot resistance.
Do I need to add heat sleeves to the wires?
The Ultra 40 wires are engineered to perform without additional heat sleeving, thanks to their heat‑resistant alloy construction. However, for extremely high‑temperature environments, optional heat sleeves can be added for extra protection.
How do I identify the correct wire for each cylinder?
Each wire in the set is pre‑labeled with its corresponding cylinder number, allowing you to match the wire to the spark plug quickly and accurately during installation.
Is this set suitable for street‑legal performance upgrades?
Yes, the Moroso Ultra 40 Race Wire set meets all standard automotive regulations and is ideal for street‑legal performance upgrades that demand reliable spark delivery.
What warranty does Moroso provide?
Moroso offers a limited warranty covering manufacturing defects for a period of two years from the date of purchase, ensuring confidence in the product’s durability and performance.






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