Polini Thor 200 EVO

Polini Motori is glad to present the new Polini THOR 200 EVO, which means never ending technical evolution for Polini Motori. The THOR 200 EVO engine has many improvements thanks to the new following features: 
• New transfers and exhaust diagrams 
• New head drawing with embedding in the cylinder 
• New crankshaft with filling inserts 
• New cooling shroud And a modification for the Walbro carburetor 

All these mechanics improvements concretize in advanced technology, better performance, and extraordinary weight/power ratio and above it is possible to exploit all the engine power. 
The cooling is better after a careful inspection of the air flows for the engine cooling and thanks to the new cooling shroud which keeps the operating temperatures under 10-15% (in standard conditions) increasing the engine reliability. 

The most important development refers to the carburation. Polini has been able to develop both the models together, one equipped with bowl carburetor and one with Walbro carburetor. And during this stage it has been clear that to finish the job it was necessary to follow two different ways: 
- Thanks to the upgrade the models with bowl carb proved to be really performing with a constant power output at all rpm, contained temperatures and reduced consumptions. Furthermore it features a torque increase and a wider engine range. Now the engine reaches 8000-8200 rpm. It is recommended the use of a propeller with more pitch to better exploit the engine trust that the new Thor 200 EVO offers. 
- To find the best Wabro carburetor setting the opening of the throttle valve has been limited: this allowed a torque increase and a smoother power output. The maximum engine range is 7400-7500 rpm and it is reached faster than with the previous Thor 200 model. It is not necessary to use a different propeller.