O.S. 21B/40E/70C Thermo Insulator for Glow Engines - OS23818140 by O.S. Engine  [OS23818140]

Heat buffer for O.S. engine heads

This O.S. Engine OS23818140 thermo insulator is an RC-scale accessory designed to fit O.S. 21B, 40E and 70C model engines to control heat transfer at the engine head. It reduces direct conduction between mating faces and helps maintain a more consistent head temperature during running and tuning.

Compatibility is limited to the model codes listed in the product name, so confirm your engine stamping before installation. Fitting is straightforward on most glow engine head assemblies using the engine's existing mounting hardware; clean and flatten mating faces and verify there is adequate clearance with surrounding components after assembly.

Use the insulator as a thermal buffer to reduce temperature swings when testing different needles and propellers, and monitor head temperature during initial runs and routine checks. This component is intended for RC engine use only and is not suitable for full-size engines.