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.
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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.
The hand starter is easier thanks to the flash starter device, which speeds up and simplifies the movements. THOR 250 engine distinguishes itself for many other advanced solutions, as, for example, the comfortable closed circuit system for the fuel recovery during transportation and the 12V output for any eventual electrical use. A version with electric starter is also available as optional. The engine has already confirmed its extraordinary performance features during the tests made on the test benches by the engineers of Polini Motori.
|Polini Engine||2 stroke monocylinder|
|Bore for stroke||64 x 60|
|Cylinder||Aluminum with Gilnisil coating|
|Piston||Two chromium plated rings mm 1|
|Intake||Reed vale in the crankcase|
|Carburetor||Walbro / Polini Float Ø28|
|Air filter||Air box|
|Ignition||Electronic with battery charger possible|
|Battery charger prearrangement||Output power 80 W at 5500 RPM|
|Spark plug hood||5k Ω resistance|
|Fuel type||Lead free petrol with 2% synthetic oil|
|Gear reduction unit||Helical teeth in oil bath with 2,8 reduction ratio|
|Starting||Pull start with self winding cable Flash Starter – Electric starter (optional)|
|Clutch||Centrifugal in oil bath|
|Muffler||Expansion with oval silencer|
|Engine weight||17,5 Kg (18,5 with electric starter)|
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