FUERA DE PRODUCCIÒN
THOR 250
THOR 250 DUAL SPARK
THOR 250
- 928.000.014 – Thor 250 with Ø28 carburetor – FLASH STARTER
- 928.000.015 – Thor 250 with Ø28 carburetor – ELECTRIC starter + FLASH STARTER
| 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 40 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 DS
928.000.019 –
| Polini Engine | 2 stroke monocylinder |
| Cooling | Liquid cooled |
| Bore for stroke | 72 x 60 |
| Displacement | 244 cm3 |
| Power | 36,5 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 1 | Electronic |
| Ignition 2 | Electronic battery powered |
| Battery charger | Output power 40 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 |
| Starting | Electric starter + Flash Starter |
| Clutch | Centrifugal in oil bath |
| Muffler | Expansion with oval silencer |
| Engine weight | From 18 Kg (without radiator) |
| Propeller rotation | Clockwise |
*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.
The main novelties are about reduced consumption, improved maximum power and torque out-put. Thanks to the new cylinder optimized admission transfers, the head has been modified with the optimization of the combustion chamber and squish, while the fuel system has been redesigned with new carburetor setting and new air-intake that improve the gas-petrol flows, making them more stable.
Thanks to this restyling, THOR 250 and THOR 250 DS are equipped with the latest version of the well-known flash starter system, improved in all its parts, with a new ergonomic handle that helps in the ignition phase and increases its safety with a better grip. These technical novelties by the R&D Polini staff make THOR 250 and THOR 250DS new, powerful and reliable engines.
Polini THOR 250 and THOR 250 DS engine feature a liquid cooled system, that grants an extraordinary steady power output and better performance at every rpm.
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 and to increase the flame propagation speed.
The advanced technology and the great performance of the new THOR 250 and THOR 250 DS give a better feeling when driving making the flight even more performing, dynamic, reactive, beside granting more stability.
THOR 250 and THOR 250 DS are provided with a balancing countershaft; this feature cancels the vibrations and guarantees such a driving comfort never felt during a flight and engines will last much longer.
Polini Motori has focused its attention to the security matter too. THOR 250 and THOR 250 DS are 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.
THOR 250 and THOR 250DS distinguish themselves 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.
THOR 250 engine adapts itself to various applications, as two-seat trikes, powered hang gliders, one-seat small three-axis, ULM motor-gliders, ULM and it is available with electric starter, that maintains the manual-starter too.
THOR 250 DS combines the safety of two electronic ignitions, two coils and two spark- plugs with redundant circuits each one independent. These features confirm it as the best engine for the following applications: one-seat three-axis, one-seat trike, light two-seat trikes and many others.
