Nitro Star Pro 21R SC
The perfect fit for your Proceed
The Nitro Star Pro 21R SC is designed in Italy by engine manufacturer Novarossi, winner of multiple world championships with their .15- and .21-size engines. This engine was designed just for HPI, so this isn't just a rebadged Novarossi engine! HPI Racing is the only company in the world to have these specifications from Novarossi.
The Nitro Star Pro 21R SC is an ABC engine, and is made in the tradition of Novarossi's .15 and .21 world championship winning engines. The engine is made with an aluminum case and piston, with a chrome-plated brass sleeve. This is the standard construction for all high-performance engines. A machining process developed from the aerospace industry is used to construct the engines for virtually zero flaws in the metal. The crankcase is vacuum-cast to lessen the probability of defects, such as density voids (spots of low density in the metal which can cause a weak point). The nine ports of the engine are profile cast for perfect alignment with the sleeve, unlike other engines which have the ports machined in after molding.
Resting on special Novarossi-designed ball bearings (patented) is a large 14mm diameter crank shaft, which gives the absolute maximum flow of fuel and power with a minimum of flex. The connecting rod uses a unique double bushing design, and is made from super-competition aircraft aluminum alloy for lightweight strength.
The race-bred slide carburetor is an extremely smooth unit that provides smooth throttle control with a super-fast reaction time! The 9mm opening allows more air into the engine for massive power. The three adjustment screws allow fine-tuning of low-speed, mid-range and high-speed air/fuel mixtures. This is a top-quality carburetor, designed for serious racers!
To maximize engine cooling, the combustion chamber and gray anodized cooling head are a two-piece design. This will ensure that the Nitro Star Pro 21R SC runs cool and efficient, for low fuel consumption and extreme engine power!
The Nitro Star Pro 21R SC comes with a sheet of Nitro Star Pro decals, slide carb, gray anodized aluminum head, and full, easy instructions for installation, break-in and tuning. Be the envy of all your Nitro racing buddies! Get ready for max speed for your Proceed racing car!
Click here for the exploded parts view and parts list!
Designed and manufactured by Novarossi in Italy, this .21-size engine is a Nitro powerhouse!
| Construction | ABC (Aluminum case and piston, Chrome-plated Brass sleeve) |
| Displacement | 3.49cc |
| Bore | 16.26mm |
| Stroke | 16.8mm |
| Crankshaft Diameter | 14mm |
| PS/Max RPM | (Because this engine was designed especially for HPI, horsepower and RPM specs are currently unavailable) |
| Weight | 320g |
| Carburetor | 9mm opening, slide-type, three-needle adjustment |
| Cooling head | Two-piece Turbo Head with optional adjustment shims available |
| Porting | Nine ports in cylinder, profile cast |
| Suggested header/pipe | HPI # 1890 OR Ron Paris #7079 and Novarossi #ART40002 |
HPI Nitro Star engines have a 2 year limited warranty. Read our Nitro Star Engine Warranty.