Sonic X.21 & X.21-FT on-road engines

Sonic Nitro Engines has released the latest version of their successful .21 engine. After extensive tests in cooperation with some of the worlds fastest drivers the Sonic X.21 engines feature the latest long stroke design offering more low and mid range power while keeping the fuel economy on a very good level. While the timing was optimized to the 16% Nitro rules, the greatest innovation is the domed top of the piston. Equipped with a 7+2 sleeve with “teardrop” work and a lightened CNC machined piston made of high percentage silicone alloy the X.21 engines sport a balanced lightweight 14mm turbo crankshaft with silicone insert to lower the rotating mass and reduce inner turbulences while the optimized backplate in the “factory-tuned” version improves the fuel flow further more.

A special finned turbo combustion chamber, which is also optimized to the shape of the new domed piston, and the super light-weight cooling head ensure best heat dispersion to keep the engine temperature at a moderate level. High quality Swiss ball bearings, a modern composite valve carburettor and two aluminium venturies (8mm + 9mm) make this engine a perfect choice for competitive racers. Additionally the “factory-tuned” engines are equipped with a ceramic main bearing and come with a handmade optimized crankshaft and sleeve.

Source: Sonic Engines [sonic-engines.com]