One of you reproached me: We know how a Wankell, a 2-stroke, a Turbo, or engines like the Liquid Piston, the FreeValve or the INNengine work… but you have never told us how a 4-stroke works, in detail. #4Stroke #car #mechanics Important notice! If you are one of those who know how a 4-stroke engine works and you think that this video does not interest you, I propose a challenge: Check if after watching it, you have not discovered something you did not know. Because as I told you at the beginning, we are going to take advantage of telling some lesser-known details. Become a member of this channel to enjoy advantages: / hermetic garage Steam, gas, gasoline… The steam engine was the one that allowed the “industrial revolution” to take off. These engines were large, heavy and not very efficient… in their favor they had the fact that they worked with anything that burned, from wood or coal to alcohol or oil and that they were simple and reliable. But, especially for cars, they were very large… There were many engineers working on internal combustion engines, which were presumed to be lighter and more efficient than steam engines. All historians recognise the first of these engines as the one designed by the Belgian Lenoir, which used gas and did not compress it. I will give you a fact: Lenoir's engine had a displacement of 18 litres and produced only 2 HP… But it was Nicolaus Otto, a German engineer, who achieved his goal and in 1876 patented a 4-stroke engine, much superior to Lenoir's. “It's brutal… but it works” Otto introduced important advances in his engine with respect to the Lenoir cycle engine: First, he conceived a compression cycle prior to the explosion, which improved performance. Second, he designed a valve system that regulated the exit and entry of gases. Third, he invented the carburettor, which turned liquid fuels into “gases”… now this concept of a “mixture” of air and fuel seems obvious to us, but at the end of the 19th century it was not so clear. Fourth, remember that we were talking about gasoline engines at the time, he designed an ignition system that made the spark jump at the precise moment he wanted the mixture to explode. Other issues, such as cooling or the accelerator system, were not considered at first… and that is where the story comes from, as they say in Italian, “si non è vero è ben trovato” something like “if it is not true, it could be”. And it is that Otto carried out his tests in a barn. At that time, the story goes that two things happened: One, Otto was clear that his invention had a future and two, he said the famous phrase “It is brutal… but it works”. Something that, despite everything, can be applied today. Filling gasoline with air, compressing it in a ratio of 10 to 1 and making a spark jump. The 4 Strokes. Otto's great invention was being able to efficiently separate and make the four strokes needed in an engine. As only one stroke is "working", the first single-cylinder engines, but even the current multi-cylinder ones, need a flywheel... but that is a lesser evil. These four strokes are: -Intake, the intake valve opens, the piston goes down and the gases are introduced into the engine. -Compression, all the valves close, the piston goes up and compresses the mixture. -Explosion, is the working stroke, in fact, they are called "explosion" engines, the spark jumps, the mixture explodes and the piston comes out downwards. -Exhaust, the valves open, the piston goes up and expels the burnt gases. What have we achieved with all this mess? Well, a piston that goes down with force… but that alternating movement of a piston that goes up and down has to be converted into a circular one and that is what the connecting rods and crankshaft are for, which are like our legs and the pedals of a bike… Does it seem simple to you? We are going to look at it in more detail, but for that we are going to need… Our hermetic whiteboard! Conclusion. This conclusion is really simple! What a great invention Mr. Otto made! Not only did it change the world, but it has made us humankind enjoy it a lot, not only because it is fun to drive, but it has also allowed us to shorten and reduce the distances between people and goods… Car of the day. And since we are talking about brilliant ideas, we are going to choose a car that proposed a brilliant idea: The Chaparral 2J 1970. In the design of this model, Jim Hall dispensed with the spoilers, which he himself had made fashionable. Why? Very simple, he closed the whole back and mounted a 45cc snowmobile engine and two vacuum cleaners that sucked air from the ground. The car literally “stuck” to the asphalt and was so good that, naturally, it ended up being banned. But you, thanks to the new PS GT7, can enjoy it and tell us if it really works as well as it is supposed to… You already know that throughout the month of March our cars of the day will be GT7s… and there are plenty to choose from!