Description
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 aluminum 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 |
| Cooling | Liquid cooled |
| Bore for stroke | 72 x 60 |
| Displacement | 244 cm3 |
| Power | 36 HP |
| *Max trust | 105 Kg with Ø 150 cm propeller |
| R.P.M. max | 8.000 |
| Cylinder | Aluminum with Gilnisil coating |
| Compression ratio | 11,5:1 |
| Piston | Two chromium plated rings mm 1 |
| Intake | Reed valve in the crankcase |
| Carburetor | Polini Ø28 float |
| 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 | E5 petrol or LL AV GAS-al with 2,5% synthetic oil 100% |
| *Consumption | 2,9 Lh 30 Kg of static trust |
| Gear reduction unit | Helical teeth in oil bath with 2,8 reduction ratio |
| Starter | Flash Starter – (Electric starter -optional) |
| Clutch | Centrifugal in oil bath |
| Muffler | Expansion with oval silencer |
| Engine weight | From 18 Kg (without radiator) |
| Propeller rotation | Clockwise |
THOR 250 engine adapts itself to various application types, as two-seat trikes, powered hang gliders, one-seat small three-axis, ULM motor-gliders, ULM.
- 928.000.014 – Ø 28 Carburetor – Flash starter –
- 928.000.015 – Ø 28 Carburetor – Electric starter+ Flash starter–Euro
100% MADE IN ITALY
*The values have been detected on the sea level at standard atmosphere. The trust and consumption values may vary according to the air temperature and density.
**E5 means the petrol type that can be used. E5= unleaded petrol 95 octanes up to 5% of ethanol. This symbol is shown on all the petrol pumps in Europe.
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