For a big boost in power upgrade to the HPI Nitro Star 18SS engine. Rated at 1.5 horsepower, the 18SS is a high torque engine with features that include aggressive porting, durable ABC construction, a large heat sink head, dual needle 6mm carburettor and a lightweight aluminium connecting rod. The large .18 cubic inch size propels, for example, the Nitro RS4 3 18SS to a top speed in excess of 50 mph or the MT-2 to a top speed in excess of 45 mph!
The Nitro Star 18SS engine is designed to be easy to start, easy to tune and rock-steady reliable. It's equipped with an easy to use recoil pullstarter and, for racing applications, can be bump started.

When purchased seperately, this engine comes with a purple heatsink as shown in the pictures. The same engine fitted as standard to some kits is supplied with a black heatsink.