What is…?
08-19-2011
#11
Senior Member
Join Date: Jan 2011
Location: Sheboygan WI
Posts: 459
Lets see if I can explain it. All 4 stroke engines are basically the same. You have suck, squeeze, bang, and blow. (get it, 4 strokes) Intake valve opens, Cylinder goes down, sucks air and fuel in to cylinder threw the carburetor, or throttle body on a fuel injected engine. valves close and piston comes up to compress mixture. Spark plug fires igniting the mixture, (bang) pushes piston down, (power stroke). Exhaust valve opens piston comes up and pushes exhaust out. And it all starts over.
The crank shaft is on the bottom of the engine, the connecting rods are connected to the crank and the pistons. Pistons go up and down in the cylinders. There is a timing chain or belt connecting the crank to the cam. The crank turns 2 times for each time the cam turns. The cam has lobes that push the lifters which connect to the push rods, those push the rockers which open and close the valves above the pistons. That covers all the basics on the mechanics of the engine.
Carborated engines: Air enters the carburetor, passes threw the venturi and the fuel jets. Fuel is atomized and passes threw the intake manifold, enters the cylinder burns, and leaves threw the exhaust.
Fuel injected: Same principle. Air enters the throttle body. May pass a mass air flow sensor, (can tell how much air passes it) Enters the intake manifold. Computer will then pulse the fuel injectors (same as fuel jets), this enters the cylinders, burns, and leaves threw the exhaust. In the exhaust there is a O2 sensor. It can tell if there is to much or to little fuel and will adjust the injectors.
Hope this helped a little bit.
The crank shaft is on the bottom of the engine, the connecting rods are connected to the crank and the pistons. Pistons go up and down in the cylinders. There is a timing chain or belt connecting the crank to the cam. The crank turns 2 times for each time the cam turns. The cam has lobes that push the lifters which connect to the push rods, those push the rockers which open and close the valves above the pistons. That covers all the basics on the mechanics of the engine.
Carborated engines: Air enters the carburetor, passes threw the venturi and the fuel jets. Fuel is atomized and passes threw the intake manifold, enters the cylinder burns, and leaves threw the exhaust.
Fuel injected: Same principle. Air enters the throttle body. May pass a mass air flow sensor, (can tell how much air passes it) Enters the intake manifold. Computer will then pulse the fuel injectors (same as fuel jets), this enters the cylinders, burns, and leaves threw the exhaust. In the exhaust there is a O2 sensor. It can tell if there is to much or to little fuel and will adjust the injectors.
Hope this helped a little bit.
08-19-2011
#12
Junior Member
Thread Starter
Join Date: Aug 2011
Posts: 25
Lets see if I can explain it. All 4 stroke engines are basically the same. You have suck, squeeze, bang, and blow. (get it, 4 strokes) Intake valve opens, Cylinder goes down, sucks air and fuel in to cylinder threw the carburetor, or throttle body on a fuel injected engine. valves close and piston comes up to compress mixture. Spark plug fires igniting the mixture, (bang) pushes piston down, (power stroke). Exhaust valve opens piston comes up and pushes exhaust out. And it all starts over.
The crank shaft is on the bottom of the engine, the connecting rods are connected to the crank and the pistons. Pistons go up and down in the cylinders. There is a timing chain or belt connecting the crank to the cam. The crank turns 2 times for each time the cam turns. The cam has lobes that push the lifters which connect to the push rods, those push the rockers which open and close the valves above the pistons. That covers all the basics on the mechanics of the engine.
Carborated engines: Air enters the carburetor, passes threw the venturi and the fuel jets. Fuel is atomized and passes threw the intake manifold, enters the cylinder burns, and leaves threw the exhaust.
Fuel injected: Same principle. Air enters the throttle body. May pass a mass air flow sensor, (can tell how much air passes it) Enters the intake manifold. Computer will then pulse the fuel injectors (same as fuel jets), this enters the cylinders, burns, and leaves threw the exhaust. In the exhaust there is a O2 sensor. It can tell if there is to much or to little fuel and will adjust the injectors.
Hope this helped a little bit.
The crank shaft is on the bottom of the engine, the connecting rods are connected to the crank and the pistons. Pistons go up and down in the cylinders. There is a timing chain or belt connecting the crank to the cam. The crank turns 2 times for each time the cam turns. The cam has lobes that push the lifters which connect to the push rods, those push the rockers which open and close the valves above the pistons. That covers all the basics on the mechanics of the engine.
Carborated engines: Air enters the carburetor, passes threw the venturi and the fuel jets. Fuel is atomized and passes threw the intake manifold, enters the cylinder burns, and leaves threw the exhaust.
Fuel injected: Same principle. Air enters the throttle body. May pass a mass air flow sensor, (can tell how much air passes it) Enters the intake manifold. Computer will then pulse the fuel injectors (same as fuel jets), this enters the cylinders, burns, and leaves threw the exhaust. In the exhaust there is a O2 sensor. It can tell if there is to much or to little fuel and will adjust the injectors.
Hope this helped a little bit.
Okay. … I'll likely have to read it a couple of times, but it does help a lot.
Thank you, Dan. Thus is the most concise, all-at-the-same-time explanation I've been given. (Previously, there was info given in bits and pieces, as part of an explanation of something else.)
I'll likely have to read it a couple times, and maybe print it out, but it does help lots.
Thank you,
Abby.
08-19-2011
#13
Senior Member
Join Date: Jan 2011
Location: Sheboygan WI
Posts: 459
Just remember, a internal combustion engine is a VERY simple process. Keep that in mind and you will understand it. Don't try to over analyze it. Suck, squeeze, bang, blow. That is it. Knowing the names of each part helps, but isn't really necessary.
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