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Auto Competition Competition: A Riddle About The Motor, Frost And Booster

2024

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Video: Auto Competition Competition: A Riddle About The Motor, Frost And Booster

Video: Auto Competition Competition: A Riddle About The Motor, Frost And Booster
Video: Common Sense Test |Brain IQ Questions and Answers | Part 40| puzzles and riddles 2024, March
Auto Competition Competition: A Riddle About The Motor, Frost And Booster
Auto Competition Competition: A Riddle About The Motor, Frost And Booster
Anonim

TASK No. 133

Frosty riddle

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“These are some incomprehensible cases,” Alekseich tells the neighbors in the garages. - My crossover stood for ten days in the country in cold weather. On the alarm, as expected. It's time to return to the city, and frost - minus thirty. Starter - not a googo. The battery seems to be one year old. It’s good that I had a booster (starting device) in store. Wound up. All heating included. While warming up, loading things, while the neighbor sedan pulled out of a snowdrift, almost an hour passed. I went. At the crossroads of kilometers after six, the motor accidentally stalled. And again, do not twist the starter! Only from the booster started. And to the city two hours in traffic jams was crowding - so at the garage the engine began to start without any boosters.”

Do you explain the reason for this behavior of the machine? Remember, short answers are not even considered.

Send the answer marked “Competition” until March 1, 2019 at the address: 107045, Moscow, Seliverstov per. 10 - or by e-mail: [email protected]. Indicate your contact phone number or other quick contact method.

We undertake to read all your posts on the topic of the contest. The prize will be awarded not only the correct, but also the most complete solution of the competitive problem with a detailed answer.

And now to summarize the “Expert Competition” from the November issue of the magazine “Behind the Wheel” for 2018

Our readers had to understand the philosophical arguments of Ivanovich that the development of cars goes in a spiral. That the ancient cars with carburetor engines and the most modern models didn’t immediately “feel” the refueling with bad gasoline, and in the interval between them there were produced both carburetor and injection models, which at the first start, felt bad gasoline.

What assumptions our readers did not make. Carburetors Ozone and Solex were compared, they talked about the features of mechanical fuel injection, and were reminded of knock sensors that save modern engines from destruction. But the task was about clean hydraulics, about the path of fuel from the tank to the engine. Therefore, we turn to the correct answer.

Initially, the power supply system for carburetor engines (in Zhiguli, for example) had a simple structure: tank, gasoline pump, and carburetor. And a significant drawback: in the heat of gasoline, due to the slow movement to the carburetor, it heated to a boiling point, a steam plug appeared - and the pump stopped pumping fuel. Therefore, around the middle of the eighties of the last century, the design (including on VAZ 2108, GAZ 2410, -3102 cars) was supplemented with the so-called return pipe - a drain pipe with a calibrated hole from the carburetor to the tank. The circulation of gasoline through the fuel system improved the cooling of the gasoline pump and prevented boiling of fuel in it, since the merged gasoline was cooled in the drain pipe and gas tank.

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Gasoline, diesel or gas - which engine is better?

In a power supply system without a drain pipe, fuel from the tank must go through a gas intake, a pipeline, a gas pump and enter a carburetor. With a drain pipe, it runs the same path, only much more intensively: the performance of a gasoline pump is two to three times greater than the maximum gasoline consumption by the engine. After pouring another gasoline, it still takes some time to quickly pump the fuel lines and produce gasoline from the float chamber.

Later there was a fuel injection system with a drain pipe. The fuel circulation scheme is almost the same as for cars with carburetor engines with a "drain". The pressure of gasoline in the system increased (2.0–2.8 kgf / cm²); The gasoline pump was initially located next to the fuel tank, and then it was installed directly inside the tank. Fuel pumping starts even before the engine starts - immediately after turning on the ignition, the gas pump starts pumping, updating gasoline even in the fuel rail.

In later injection systems, a drain pipe was abandoned, which simplified the design. A regulator that maintains a constant pressure in the fuel system is located inside the fuel module located in the tank. As much fuel as the engine consumes is fed into the ramp. Due to a decrease in the supply per unit time, the gasoline in the fuel rail and lines became more heated, and to reduce the likelihood of boiling in the ramp, the pressure was increased to 3.6–4.0 kgf / cm², regardless of the load. The scheme is similar to a carburetor without a "drain". "Bad" gasoline began to get to the engine longer. Therefore, the reaction time of the engine immediately after refueling with low-quality gasoline increased. Indeed, development is spiraling!

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