POLINI THOR 200 HF - Walbro WB37 – carburetor – ELECTRIC starter + manual FLASH

Description

POLINI THOR 200 HF
ENGINE
Walbro WB37 – carburetor – ELECTRIC starter + manual FLASH STARTER
The new Polini Thor 200 HF has been developed by the Polini R&D team using the new 3D modeling software systems and flow dynamic simulation. The result of this research and the introduction of the innovative Spark Cooler System grant better cooling improving the performance of the Thor 200 HF. It has been used during the last 2018 French Championship and it has already won its first title with the pluri-world champion Alex Mateos, confirming the reliability of the new THOR 200 HF.
All these mechanical 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 has been improved 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.
Technical features:
“HF” COOLING SHROUD
The new design of the “COVER” cooling shrouds optimizes and accelerates the incoming flows and increases the exit power towards the propeller.
Together with the air forced system it grants great performance in terms of cylinder cooling.
SPARK COOLING SYSTEM
SCS is the innovative cooling system of the spark plug that lows the working temperatures in the point of highest warm and in the burning chamber, eliminating the events of over-heating. Polini SCS system reduces the EGT temperatures till 100 C° and till 50 C° the ones under the spark plug.
HEAD
The new profile of the burning chamber improves the propagation of the flame optimizing the fuel combustion phase. This peculiarity, together with the increasing of the compression ratio, improves the engine performance reducing the fuel consumption.
CARBURETOR AND AIR BOX
The new carburetor set up has been improved thanks to a series of workings inside the carburetor finalized to increase the power output and the vaporization of the petrol/air mixture. Two fuel systems are available: bowl Ø28 carburetor or Walbro WB37 carburetor.
CENTRIFUGAL CLUTCH
The centrifugal clutch has been studied to grant the best safety features during all the stages: starting, take off, flight and landing.
BALANCING COUNTERSHAFT
It is equipped with a balancing countershaft which cancels any vibration granting more comfort.
EASY STARTER
Polini Thor 200 HF engine is provided with the new Polini “Flash Starter”, easy and fast to start. A version with electric starter is also available.
SPECIFIC POWER UNIT
Light alloy casting cylinder with liner with nickel-chrome plating for the best piston sliding. The piston is made of gravity die-cast light alloy at high silicon content with 2 special chromed and nitride steel rings. The design of the piston top optimizes the compression ratio.
CRANKSHAFT
The design of the crankshaft has the aim to increase the primary compression ratio and grants a better mixture flow.
EXHAUST SYSTEM
The exhaust system is completely hand made for a better product quality. It is divided into two sections with manifold with spherical connection and fixed on natural rubber suspensions that grant longer life. The exclusive new springs with steel hooks make them stronger and offer the possibility to be better fastened. The exhaust system has a compact design and contained dimensions to reduce the weight. The small overall dimensions improve the aerodynamic and grant a low noise level
FRAME CONNECTIONS
The frame-engine connecting points of the Polini Thor 200 HF are the same as the other engines: 80, 130, 190 HF and 250. This characteristic makes the engine interchangeable on all the dedicated frames.
ADVANCED SOLUTIONS
Polini Thor 200 HF engine features many other technical solutions and safety characteristics.
System with closed circuit for the fuel collection during its transportation (only for models equipped with bowl carburetor). Prearrangement for 12V exit for future electric devices.
Very low propeller overturning torque granted by the counterturning masses.
DEVELOPMENT
It has been developed and produced following all the criteria for the handcraft products with the most modern and advanced production methods and under the supervision of highly specialized technicians who have achieved great experience, skill and creativity during the years.
Polini Engine
2 stroke monocylinder
Cooling
Forced air
Bore for stroke
64 x 60
Displacement
193 cm3
Power
30 HP
R.P.M. max
8.100
Cylinder
Aluminum with Gilnisil coating
Compression ratio
12:1
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)
Propeller rotation
Clockwise
100% MADE IN ITALY