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

Technical fin heatsink for Savage engine heads

This fin-style heatsink is engineered for use on HPI Savage 21, Savage 25 and Savage X 13 engine heads to improve passive heat rejection. The design increases exposed head surface area to lower peak running temperatures while remaining a model-only component not intended for real vehicle use.

Installation follows standard nitro practice: remove the current head, inspect thread engagement and axial clearance, then slide the heatsink over the head ensuring no interference with the carburettor, exhaust manifold or chassis fixtures. Confirm rotating clearance by hand prior to first start and reverify after an initial thermal cycle.

From a performance viewpoint the heatsink aids thermal stability by expanding convective surface area; it performs best when combined with effective airflow management, correct fuel mixture and a sound exhaust condition. Use it as part of a holistic thermal control strategy during tuning and testing.

A purpose-built fin heatsink for Savage-series nitro heads that should be checked for fit and rotating clearance and integrated into routine engine maintenance and tuning checks.