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Polini THOR 303
Polini Motor presents the new Thor 303, a concentration of power and technology.
An innovative engine with important novelties that result into reliability, power. Reduced weights, reduced aerodynamic section and moderated depth.
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ABOUT
Polini Motori presents the new Thor 303, a concentration of power and technology.
An innovative engine with important novelties that result into reliability, power. Reduced weights, reduced aerodynamic section and moderated depth.
![](http://gear.toprudderaircraft.com/cdn/shop/files/1.jpg?v=1716136600&width=700)
Thor 303 is the result of 3 years of hard work, design and tests both on the Polini modern testing benches and of our professional Italian and international pilots. An accurate work that doesn’t stop after the production, when every single engine is tested and inspected before delivering it.
![](http://gear.toprudderaircraft.com/cdn/shop/files/2.jpg?v=1716136647&width=700)
The cylinder has been designed and manufactured for the specific aeronautic useby exploiting the best modern technology. Thereal displacement is 281cc with 76mm bore and 62mm stroke.The cylinder has 5 transfers to give precise and performance and at all rpm , giving smooth and powerful output able to offer more than 120kg of static thrust with 160cm* propeller installed.The head is designed with a special combustion chamber that make the flame front faster.
![](http://gear.toprudderaircraft.com/cdn/shop/files/3.jpg?v=1716136719&width=700)
Thor 303 is equipped with an air filter which is the result of a deep fluid dynamic studythat has the aim to optimize the air speed inside it to grant the perfect pressure to feed the carburetor at every rpm. By reproducing a S circuit that stabilizes the turbulences, the new filter lets a linear, sweet and constant output. It is possible to open and check it; inside there is a supporting frame for its filtering carpet made of polyurethane foam withopen cells of 30 PPI (holes per inch): this supporting frame has been designed to have a fixing able to prevent the carpet from moving or collapsing on it. Furthermore the filter cage can be opened in a half through two screws to be easier to replace it during standard servicing.
Thor 303 is the result of 3 years of hard work, design and tests both on the Polini modern testing benches and of our professional Italian and international pilots. An accurate work that doesn’t stop after the production, when every single engine is tested and inspected before delivering it.
The cylinder has been designed and manufactured for the specific aeronautic useby exploiting the best modern technology. Thereal displacement is 281cc with 76mm bore and 62mm stroke.The cylinder has 5 transfers to give precise and performance and at all rpm , giving smooth and powerful output able to offer more than 120kg of static thrust with 160cm* propeller installed.The head is designed with a special combustion chamber that make the flame front faster.
Thor 303 is equipped with an air filter which is the result of a deep fluid dynamic studythat has the aim to optimize the air speed inside it to grant the perfect pressure to feed the carburetor at every rpm. By reproducing a S circuit that stabilizes the turbulences, the new filter lets a linear, sweet and constant output. It is possible to open and check it; inside there is a supporting frame for its filtering carpet made of polyurethane foam withopen cells of 30 PPI (holes per inch): this supporting frame has been designed to have a fixing able to prevent the carpet from moving or collapsing on it. Furthermore the filter cage can be opened in a half through two screws to be easier to replace it during standard servicing.
![](http://gear.toprudderaircraft.com/cdn/shop/files/1.jpg?v=1716136600&width=700)
![](http://gear.toprudderaircraft.com/cdn/shop/files/2.jpg?v=1716136647&width=700)
![](http://gear.toprudderaircraft.com/cdn/shop/files/3.jpg?v=1716136719&width=700)
Learn more
Product specification
2 stroke monocylinder
Liquid cooled
76 x 62
281 cm3
38 HP at 8000 rpm
120 Kg with Ø 160 cm propeller
8.400