HPI Savage Performance Fin Heatsink HSA-027/G Technical Upgrade by 3Racing  [HSA-027/G]

Technical notes for fin heatsink installation

This fin-style heatsink mounts to the engine head on HPI Savage 21, Savage 25 and Savage X 13 types sharing the same head geometry. CNC-style fin geometry and a gold anodised finish increase surface area and resist corrosion while offering a straightforward external cooling solution that does not alter internal head geometry.

Fitment is constrained to heads with matching profiles and factory mounting points. Prior to assembly, inspect head contours, measure clearance to the muffler and carburettor, and confirm body shell clearance. The heatsink is designed to bolt on using the existing head fastener pattern and functions as an external thermal management aid for nitro engines.

Installation procedure: seat the heatsink onto the head, align fins with expected airflow, and secure using the original screws or studs torqued to specification. Verify there is no contact with the exhaust system or bodywork at full travel and ensure glow plug access remains unobstructed. Reassess fastener torque and clearances after initial heat cycles to confirm stable seating.

Performance role: the heatsink provides passive dissipation and will not modify engine timing, porting, or fuel requirements. Use thermocouple measurements or trackside readings to evaluate benefit and integrate the heatsink with optimised body venting and exhaust routing for effective thermal control.