O.S. Engine OS71641500 High-Heat Turbo Glow Plug P5 Hot for R/C Nitro Engines  [OS71641500]

P5 HOT: Performance Summary

This P5 HOT turbo-design glow plug is built for use in nitro model engines as an ignition component. The P5 mark identifies a hotter filament heat range than lower numbers, which changes how the plug holds temperature and how the engine ignites under different loads.

It helps with difficult cold starts and can improve idle stability in engines that favour a hotter glow element. In tuning practice, selecting a hotter or cooler plug is a complementary step alongside needle and carb adjustments; the plug modifies filament thermal response rather than airflow or fuel metering.

Fitment tips: only install in engines that accept this thread and size, use a suitable glow-plug wrench, and avoid excessive torque to prevent thread damage. Make sure seating is even and clear any debris from the combustion area. Re-check starting and idle after installation before further tuning.

Safety note: for model use only. Allow the plug to cool before handling and observe general nitro fuel safety procedures when working on the engine.