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This mini vertical 4-stroke gasoline engine, has 12 cc, four OHV cylinders and with a mechanical limiter, to stabilize a defined speed according to the need of the situation. This system is known as a "governor", the same system used in stationary engines. In addition to being cooled by water circulation, with a heat sink, water pump and fan.
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► Engine origin:
This H75 engine is a miniature replica of the Caterpillar Holt 75 gasoline engine, which was one of the best selling "tractors" from 1910 to 1920 for agricultural and military purposes. They were built by the Holt Manufacturing Company of California (USA), named after Benjamin Holt and also manufactured in Great Britain by Ruston & Hornsby in Lincoln.
► Military use:
They gained a reputation as a quality farm tractor among farmers and around 2,000 Holt 75s were used extensively in World War I to transport heavy artillery and ammunition, by the armies of England, France, the United States, and in some other countries.
It had a top speed of 15 miles per hour (24 km/h) with a 75 horsepower gasoline engine.
► Care:
- must only be handled by adults;
- it is not necessary to lubricate oil in the crankcase, but manual lubrication of the connecting rods and crankshaft is recommended periodically for long periods of use;
- it is mandatory to add 2% oil 2 times, mixed with gasoline;
- after a few days of rest, remove the fuel from the fuel tank;
- make sure that the three 1.5 volt batteries are charged;
- be careful to avoid serious burns from the engine exhaust, which is extremely hot;
- the initial start of the motor is carried out in a clockwise direction;
► Positive points:
- a perfect replica of the original engine;
- the sound produced by the engine is loud and shocking;
- it is recommended to manually lubricate the crankshaft periodically with oil;
- good performance and a lot of torque;
- low consumption of batteries in the electric ignition;
- easy to start the engine;
- good stability in its operation;
- does not require any adjustment;
- practically all the metals used in its construction are brass;
► Negative points:
- the radiator fan is not efficient;
► Product features:
- Material: Brass + Stainless Steel + Bamboo
- Motor Size: 230 X 100 X 180mm
- Wooden base size: 250 X 120 X 30mm
- Displacement: 12cc
- Diameter: 13mm
- Stroke: 20mm
- Ignition source voltage: 4.5 V (using 3 AA batteries, excluding batteries).
- Starting method: external force (electric drill) or manual
- Suitable age: 14 years old or older
- Product Weight: 3500g
- Fuel tank with capacity for 8 ml of gasoline
- Water tank with a capacity of 30 ml
- Start mode: External force (electric drill) or manual pull start
- Fuel: Gasoline or aviation kerosene (fuel needs to be mixed with a small amount of lubricating oil for combustion)
► Observations and personal opinion:
1 - This is a product with a decorative purpose, it has an impeccable finish, with aesthetic details incredibly similar to a real engine.
2 - Do not exceed the maximum capacity of 8 ml of gasoline in the fuel tank, as gasoline can be expelled through the fuel tank vent.
3 - The entire engine block is made of brass, some parts such as the cylinder, crankshaft, command in stainless steel and the piston in aluminum.
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