HPI Savage 21/25/X 13 Fin Engine Heatsink by 3Racing HSA-027/R  [HSA-027/R]

Fin engine heatsink for Savage series

This fin-style engine heatsink is a scale RC accessory intended for use on HPI Savage 21, Savage 25 and Savage X 13 engines. It is a passive cooling component that increases exposed surface area around the engine head to assist heat dissipation during running. The piece is designed for model use only and not for any real vehicle applications.

Installation is straightforward for hobbyists familiar with nitro setups: remove the existing glow head or cooling head, check thread and clearance, and slide the heatsink over the engine head while confirming there is no interference with the carburettor, exhaust or surrounding chassis parts. Verify fit and rotating-clearance before first run and recheck after the first heat cycle.

In tuning terms the heatsink helps manage peak temperatures by increasing surface area and improving convective cooling. It is most useful where airflow is available or can be directed by the body or chassis layout. Use it as part of a broader thermal check that includes fuel mixture, exhaust condition, and cooling airflow routes.

A practical fin heatsink for Savage-series nitro engines, intended to be checked for fit and clearance during installation and used alongside regular engine maintenance.