10 - 50hp piston engine THOR 250

10 - 50kgfor paramotor2-stroke

Polini THOR 250 engine features a liquid cooling system, that grants an extraordinary steady power output and better performance at every rpm. Thor 250 engine is small and very compact with a great power/weigh ratio. The die cast light-alloy aluminium cylinder grants a better thermal stability. The liner with Nickel-Siliceous coating improves the piston sliding, its resistance to wear and abrasion. The piston, gravity cast at high silicon content light alloy, reduces thermal expansion and the coupling slack. The piston top design is specific to optimize the compression ratio. The advanced technology and the great performance of the new THOR 250 gives a better feeling when driving making the flight even more performing, dynamic, reactive, beside granting more stability. THOR 250 is provided with a balancing countershaft; this feature cancels the vibrations and guarantees such a driving comfort never felt during a flight and a better engine lasting. Polini Motori deeply directed its attention to the security matter too. THOR 250 is in fact provided with a centrifugal clutch entirely in oil bath, with a mechanical gear with helical teeth. The counter revolving rollers considerably decrease the upsetting torque-steer for a further flight comfort.