NX-15 Lighting The NX15 lightning engine is arguably the most powerful .15 pull start engine in its price range. This is the same engine that comes standard with the 73.4 MPH CT4S nitro sedan. The lightning shares many of the performance enhancing features that were developed throughout the development of the Turbo 2.5 engine. Special Features: · Big Block power · Easy to use pull starter · High end performance at low cost Big Block 2.5 Displacement: .15ci Ports: 3 Rear Exhaust Starter Type: Pull Start Carburetor: 2 needle slide Crankshaft: SG shaft Piston / Sleeve: ABC Green-anodized cooling head Horsepower: 1.5hp @ 33,000rpm