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

Fin-style heatsink for Savage engines

This fin-style engine heatsink is a bolt-on accessory that fits HPI Savage 21, Savage 25 and Savage X 13 models sharing the same head profile. The gold anodised fins increase exposed surface area around the engine head to aid heat dispersion while bashing, without changing internal engine geometry.

Compatibility is limited to the listed Savage variants that use the same engine-head shape. Check head contours and body shell clearances around the exhaust and carburettor before fitting; physical interference is the most common issue with head-mounted cooling parts. The heatsink installs using the engine head's existing fastener points as an external cooling aid for nitro powerplants.

Installation notes: place the heatsink onto the head, orient the fins for airflow, and reuse the head screws or studs where appropriate. Confirm there is no contact with the muffler or bodywork through full suspension travel, and verify glow plug access after fitment. After initial runs, recheck fastener torque and clearances as thermal cycling can alter seating.

Tuning and operational role: the heatsink offers passive cooling only and does not modify timing, porting, or fuel needs. Use a temperature probe or trackside observations to gauge effect and adjust body venting or muffler routing as part of overall thermal management. Expect modest temperature moderation rather than dramatic changes.