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

Fin Heatsink for Savage Series

This fin-style engine heatsink is a scale RC accessory designed for HPI Savage 21, Savage 25 and Savage X 13 models and supplied as the 3Racing HSA-027/BL part. Its role is to sit over the model’s nitro engine head and provide additional surface area to passively dissipate heat during running, helping maintain consistent engine temperature under load.

Fitment and installation are straightforward on compatible Savage nitro engine heads that accept an accessory heatsink; use the original head screws where possible and check for secure, even contact across the head surface to avoid creating hotspots. No special tools are required beyond common hobby hex drivers and spanners.

For tuning and maintenance, consider the heatsink as a passive aid: it does not change carburetion or fuel requirements but can reduce peak cylinder head temperatures during long runs. Inspect mounting screws after initial runs and clean fins of dirt and debris to preserve airflow.