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

Fin-style Cooling Accessory for Savage Nitros

This fin-style engine heatsink is a scale RC accessory made for HPI Savage 21, Savage 25 and Savage X 13 models and supplied as the 3Racing HSA-027/BL part. It fits over the nitro engine head to add surface area for passive heat dissipation, helping to keep head temperatures more consistent during extended or high-load running.

Fitment is simple on Savage nitro heads that accept an external heatsink; reuse the original head screws where possible and ensure the heatsink sits flat against the head to avoid uneven contact. Installation typically requires only common hobby hex drivers and spanners.

Think of the heatsink as a passive cooling aid rather than a tuning change: it does not alter carburetion or fuel needs but can reduce peak temperatures on long runs. After the first outings check screw tightness and keep fins clear of mud and oil to preserve airflow.