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

Racing-oriented Fin Heatsink Overview

The fin heatsink is an accessory engineered for HPI Savage 21, Savage 25 and Savage X 13 nitro engine heads, supplied under part HSA-027/BL. It increases exposed metal surface to aid passive thermal dissipation during sustained high-load operation, making it a practical choice for racing and endurance runs.

Fitment requires a compatible head pattern that accepts accessory heatsinks; install with the original head screws where possible and verify the heatsink base sits flat against the head to ensure even thermal contact. Routine hobby tools are adequate for fitting.

From a setup perspective this is a passive component that does not alter fuel or carburation. It reduces peak cylinder head temperatures by improving heat transfer away from the head. For consistent results inspect fasteners after break-in runs and keep fin channels clear of grime to preserve airflow.