Get your tractor on this page: bit.ly/3fjm7wT ► using the code "Leandro" get 10% discount. This text presents a summary of the tractor's characteristics, technical data of the engine, care to be taken and its purpose.
► The following video explains the operation of this type of engine ("fire-eater" engine): • Veja como funciona o m...
It is a product with decorative purpose, adding an external combustion thermal engine, giving life to the miniature. Below, reservations are made regarding its limitations.
► Cautions:
- must be handled by adults only;
- powder graphite is recommended for piston lubrication, as shown in the video;
- the use of lubricating oil on the piston is not recommended, as it generates friction and problems in operation;
- in case of rest for more than 7 days, apply degreasing spray to prevent oxidation of the cylinder; if there is oxidation, it may be necessary to dismantle the engine, as shown in the video;
- maintain caution to avoid burns; the entire hood of the tractor is extremely hot, as warned in the video;
- the engine runs with a 92.8 ° INPM alcohol lamp or butane gas; only the lamp accompanies the product.
► Positive points:
- pleasant for those who like retro design (20th century tractor);
- the sound produced by the engine is charming;
- the piston does not lock inside the cylinder even when it is very heated;
- has differential transmission for traction on the rear wheels and headset;
► Negative points:
- low torque at low speeds;
- instability in the flame when exposed to the wind, impairing the operation of the engine; recommended to work on a flat and unobstructed surface;
- a large part of the tractor is assembled by hand, justifying its value;
- the headset has clearance;
► Technical data:
- piston stroke: 22 mm
- piston outside diameter: 12 mm
- lag between piston and valve: 30 °
- cylinder material: steel
- piston material: hardened steel
- using alcohol, the engine reaches 1500 rpm; with 2400 rpm butane gas; both measurements in free rotation.
Why is it NOT considered a Stirling engine?
- Despite being an external combustion engine, the operation is in an open cycle, that is, the cylinder aspirates fire; different from the closed-loop Stirling.
How does a fire-eating engine work? (also known as "Flammenfresser", "engine vacuum" or vacuum engine):
When the valve is opened, the piston is displaced towards the crankshaft axis, so that fire is sucked into the cylinder. Then the valve is closed, generating a vacuum by cooling the hot gases inside the cylinder. With this vacuum, the piston is pulled towards the valve. When the piston approaches the valve, the vacuum effect ends, and the combustion gases are expelled. The valve vane is movable, so that it allows gases to escape. Then, the cycle is restarted.
This year, I intend to build an engine similar to this one, but with homemade materials. I already selected the ones to be used.
The torque of this engine is low, lower than a Stirling engine. However, it has good speed and a lovely sound.
► Conclusion:
The tractor has a pleasant design, works well with graphite powder for lubricating the cylinder and without the presence of wind. I again inform you that it is a decorative object, it works with the reported restrictions, I do not recommend that it be tested on steep and steep slopes due to the low torque of the engine. The differential is relatively fragile, with possible breakage if subjected to exaggeration.
I recommend the website of "Enginediy", a serious and reliable company. The Product is not taxed for Brazil. If it is blocked at customs, a new product will be sent to the customer without additional fees.
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Thank you all for the attention.
Leandro Wagner.