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

Nitro head fin heatsink for Savage models

This fin-style heatsink is a scale RC accessory made to suit HPI Savage 21, Savage 25 and Savage X 13 engine heads. It provides passive cooling by enlarging the exposed head area to assist heat dissipation while the engine is running. It is intended for model applications only and not for use on real vehicles.

Fitting is straightforward for hobbyists: remove the current glow or cooling head, check thread and clearance, then slide the heatsink over the head assembly and confirm it does not interfere with the carburettor, manifold or chassis components. Always ensure rotating clearance before the initial run and recheck after the first heat cycle.

As part of tuning, this heatsink helps manage peak temperatures by increasing surface area and improving convective cooling. It works best where airflow is present or can be directed by the body and should be used together with fuel and exhaust checks to maintain safe operating temperatures.

A useful fin heatsink for Savage-series nitro heads that should be trial-fitted and checked for interference before regular use.