This is the Novarossi "Ultra" #4 very hot standard glow plug. This is a great
plug for 1/10th scale .12 race motors. It is usually too hot for 1/8th
scale on or off road motors.
The "Ultra" line of plugs from Novarossi are different from regular plugs in that the hole where the filament is located is slightly larger in diameter, and the glow plug element has a special coating. The new coating is intended to make the plug be more durable, while the larger diameter hole is designed to improve the idle and throttle response of the engine.
The Novarossi line of standard glow plugs are available in the following variations:
- #4 - Very hot filament glow plug
- #5 - Hot glow filament plug
- #6 - Medium filament glow plug
- #7 - Cold filament glow plug
- #8 - Very cold filament glow plug