Single Cylinder Vertical Hit and Miss
Petrol Model Engine
Complete and Ready to Run
The single cylinder vertical hit and miss engine is a simple design, yet retains the basic mechanics of early internal combustion (gas/petrol) engines which powered many workshops, factories and farms in the late nineteenth and early twentieth centuries.
A hit-and-miss engine is a, usually 4-stroke, stationary internal combustion engine that is controlled by a governor to only fire at a set speed. They were conceived in the late 19th century and produced by various companies from the 1890s through to the 1940s.
The name comes from the speed control on these engines: the ignition fires ("hit") only when operating at or below a set speed, and cycle without firing ("miss") when they exceed their set speed. The sound made when the engine is running without a load is a distinctive "Snort POP whoosh whoosh whoosh whoosh snort POP" as the engine fires and then coasts until the speed decreases and it fires again to maintain its average speed. The snorting is caused by the atmospheric intake valve often used on these engines (only the exhaust valve is actuated).
The governor mechanism is made mainly from brass and is geared directly from the crankshaft. The governor is based around two weights that fly out as the speed of the engine increases. This then holds the exhaust valve open, preventing a vacuum in the cylinder and causing the intake valve to remain closed, thus interrupting the Otto cycle firing mechanism. This speed is not readily adjusted on the engine.
This vertical engine is cooled by a cylinder water jacket and a radiator with mechanical pump.
The engine is mounted on an oak wood base and has an aluminium box for the ignition system with on/off switch.
This engine has two heavy steel flywheels to ensure smooth operation at relatively low speeds and side mounted fuel tank.
The included ignition system is powered by a 3 x AA battery pack (batteries not included), has solid state ignition module and hall effect points.
Specification:
Item Name: Vertical Hit and Miss Engine
Engine Size: 180 x 125 x 220mm
Cylinder Diameter: 22mm
Stroke : 20mm
Displacement: 6 CC
Revolution: 1200RPM
Ignition Power Supply: 3 x AA Batteries(Not Included)
Fuel: Petrol
Weight: 2.2KG
Total Weight of Packaging: 2.5KG
Revolutions Per minute:1200rmp
Engine Starting Steps:
1. Open the ignition box to check the wiring of the engine, install the three AA batteries then close the box and connect the fuel tank pipe.
2. Fill the fuel tank with a petrol and 2 stroke oil mix (3%).
3. On the right side of the engine, slowly turn clockwise by more than one turn to suck the petrol fully into the cylinder, cover the carburettor air intake with finger. Make sure there is no air in the fuel pipe.
4. Turn on the power switch and turn the flywheel clockwise to start the engine clockwise on the right side of the engine.
Starting Tips:
1. If the ignition system is working and the cylinder has normal compression, if the machine still does not start normally, it is very likely that the carburettor needle should be adjusted.
2. Screw the screw on the top of the carburettor, then loosen 1/4 turn, turn the flywheel. This can be done several times to make the mixing ratio of petrol and air reach the normal working mix ratio.
3. Check if the water tank needs water. If there is air in the cooling pipe, the pump will not work normally. Remove the water pump outlet screw, turn the engine over until all the air is expelled then replace the screw.
4. To stop the engine stops, the power switch should be turned off.
What's in the Box:
1 x Vertical Hit and Miss Engine
1 x Engine Spare Parts Hand Start Device
NOTE: The model engines are NOT children’s toys and should not be assembled or operated by children unless under close supervision of an adult.
Single Cylinder Vertical Hit and Miss Engine
- Product Code:HMVS
- Availability:2
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£350.00