Manov goes back to school Homework N° 1

[manovlov]

I always said that the front hood was useless...

[BlackBart]

15. What is the role of supercharging?

Answer:

Historically, supercharging has been used to quadruple the horsepower of large American muscle cars, thus increasing the rate of spin of Earth if one accelerates toward the East, or slowing Earth's spin if one accelerates Westward.



olds.jpeg

dood...I heard you like superchargers so I put a supercharger on your supercharger.

[BlackBart]

Also - I'm sure they were around before that, but in WWII, various planes added superchargers to make enormous power at high altitude where there's not enough air. Spitfire, P-51, P-38...I'm sure many others.


Rolls Royce Merlin V-12

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P-38 with Allison V-12 - A sort of turbocharger supercharger hybrid, behind the engine.

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P38 blower.jpg (178.6 KiB) Viewed 345 times

[BlackBart]

Homework N°2

Hy Buddies ! Here are the questions from my second lesson.

1. What are the functions of the throttle valve?
2. What are the types of fuel injection systems used in automobiles?
3. What types of injectors are used in automobiles?
4. How can we easily differentiate between the types of injectors?
5. What is the stoichiometric ratio? What is its value?
6. What is the interest of octane in gasoline? Indicate the values used in France.
7. How are the spark plugs powered?
8. When are glow plugs used? What are the functions of the engine cooling system?
10. What are the characteristics of the coolant?
11. Why is the cooling system under pressure?
12. How and with what elements is the engine temperature regulated?
13. What types of lubrication are used in an engine?
14. Indicate what the following oil characteristics are: 5W40.
15. What is the role of supercharging?
16. What are the types of compressors and their drives?
17. Why is it important to use a heat exchanger on a supercharger circuit?

Others are far more qualified than me, but here are some guesses -
1. Increases the air flow to the cylinder, which when mixed with fuel, produces more power.
2. Mechanical, electronic...?
5. Ratio of air to fuel in the combustion mixture. Has to be very close to 14.7 to 1 in gas engines, a hair less in diesel I think.
6. Higher octane, higher resistance to knocking and pre-ignition, more power production for a given amount of fuel.
7. They're ZAPPED! By a coil or coils that produce high voltage for a short time.
11. A cooling system under pressure can handle / absorb more heat before boiling.
12. Coolant passages past the combustion chambers, a pump or gravity flow system, a thermostat that opens when the coolant reaches a set temperature, and a heat transfer device (radiator) where airflow removes the heat in the coolant.
13. Oil, oil, and other types of oil.
15. A SUPERcharger forces additional air-fuel mixture into the combustion chamber, above atmospheric pressure, which produces more power. Belt-driven, gear-driven, sometimes exhaust gas-driven.
17. Compressing the air produces a lot of heat. A cooler mixture in the combustion produces more power as it's more dense.


....are we supposed to wait until you've answered these...?

[BlackBart]

OH...WAY before WWII.....

The wiki tells me: "The first supercharged engine was built in 1878, with usage in aircraft engines beginning in the 1910s and usage in car engines beginning in the 1920s. In piston engines used by aircraft, supercharging was often used to compensate for the lower air density at high altitudes."

[volvolugnut]

10. A coolant should prevent corrosion, be a good heat transfer agent, not freeze until well below 0 Deg C., not foam, and not boil below 100 Deg. C.
11. Pressurized cooling systems raise the boiling point of the coolant to allow operation of the engine at higher temperature without boiling and loss of coolant. Higher engine operating temperature is more efficient.
12. A cooling system must be closed and leak free, pressurized to raise boiling point, include a pump for circulation of the coolant, include a radiator to reject the excess heat, and include a thermostat to regulate flow for temperature regulation.
16. Turbochargers are driven by exhaust gas turbines. Superchargers are driven by mechanical drive from the engine or electrical drive.

BB good question are we to suggest answers or check the answers given?

volvolugnut

[manovlov]

10. A coolant should prevent corrosion, be a good heat transfer agent, not freeze until well below 0 Deg C., not foam, and not boil below 100 Deg. C.
11. Pressurized cooling systems raise the boiling point of the coolant to allow operation of the engine at higher temperature without boiling and loss of coolant. Higher engine operating temperature is more efficient.
12. A cooling system must be closed and leak free, pressurized to raise boiling point, include a pump for circulation of the coolant, include a radiator to reject the excess heat, and include a thermostat to regulate flow for temperature regulation.
16. Turbochargers are driven by exhaust gas turbines. Superchargers are driven by mechanical drive from the engine or electrical drive.

BB good question are we to suggest answers or check the answers given?

volvolugnut

hY,

I just give you asked questions to let you figure out how i progress. Thanks to all of you to complete my knowledge... Manov

[volvolugnut]

The questions presented are good, open ended questions. They are not just yes or no answers. Sounds like a good course of study.
volvolugnut

[abscate]

2. What are the types of fuel injection systems used in automobiles?

Fuel injection can be either electronic or mechanical ( very clever)

Types include continuous injection, sequential injection, batch injection, direct injection.

I think there is also variation of the place where the fuel is injected, into the manifold, right behind the intake valves like P80s, direct into cylinder (?)

[manovlov]

2. What are the types of fuel injection systems used in automobiles?

Fuel injection can be either electronic or mechanical ( very clever)

Types include continuous injection, sequential injection, batch injection, direct injection.

I think there is also variation of the place where the fuel is injected, into the manifold, right behind the intake valves like P80s, direct into cylinder (?)

My answer went this way. But the teach said that he was expected mechanics injectors and electrics ones... a half point on the question for Manov.

Result : A+