Recent comments in /f/gifs

shikuto t1_iwfsmbv wrote

Reply to comment by GustavSpanjor in How an engine works. by ooMEAToo

>Now both exhaust and fuel intake is open on a downstroke.

No they’re not… Watch it again. Blue (intake) is open on a down stroke, red (exhaust) is open on the up stroke.

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shikuto t1_iwfsfkn wrote

Reply to comment by Wallace_W_Whitfield in How an engine works. by ooMEAToo

The lights (combustion of the fuel) happen at the top of every other movement of each piston. If you watch just the left-most piston, you’ll see the 4-stroke cycle (aka Otto/Diesel cycle, aka suck-squeeze-bang-blow.)

If you start watching the first piston right as the light flashes, the piston is at the top of the stroke length. This is the combustion portion of the cycle, or the “bang” part. This combustion creates rapidly expanding gas, pushing the piston down the cylinder.

Once it gets to the bottom of its travel, you’ll notice one of the valves at the top of the cylinder open up. Then the piston rises back up the length of the cylinder. This is pushing the exhaust gas out of the cylinder - the “blow” part.

After that, the exhaust valve closes, and the intake valve opens up. The piston is traveling back down the cylinder, due to the other pistons rotating the crankshaft. This pulls in air, and at the same time, modern internal combustion engines will spray the fuel of choice into the cylinder via fuel injectors. This is the “suck” part of the cycle.

Next up, at the bottom of the travel again, the intake valve closes. The piston travels back up the cylinder. Since it is now a sealed environment, the air-fuel mixture inside is compressed. This is the “squeeze” part. Then we’re back to the “bang” when the light goes off again.

In a diesel engine, the pressure and temperature alone cause the fuel to ignite, while gasoline engines utilize a spark plug for ignition. Ignition from pressure and temperature alone in a gasoline engine is referred to as detonation, and is a particularly bad thing to have happen.

It’s a little unorthodox to start the explanation of the power cycle at the ignition phase, but I think it’s useful to have the light as a good starting point when there’s a visual representation.

Hope this cleared something up for you!

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hellcat_uk t1_iwfpbp7 wrote

Reply to comment by Riegel_Haribo in How an engine works. by ooMEAToo

Looks a lot like the Fiat TwinAir with the integrated exhaust manifold in the block and the oil powered variable valve timing though I can't see if the timing is individually controlled. Extra cylinder in the Ford obviously!

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drjude518 t1_iwfo0e0 wrote

Reply to How an engine works. by ooMEAToo

Very beautiful. Whether it works or not I want one. Are those emeralds at the top? Could do the whole thing again made out of precious metals; gold, argentium, platinum….

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Gaothaire t1_iwfluba wrote

Reply to comment by Affectionate-Pea282B in Scared the bejesus out of him! by StcStasi

Yeah, I don't think it's working, you seem really stressed. Maybe you should look into another healing modality, there's great work being done in somatics, using your body to release traumas and live a happier life

My initial comment pointed to therapy, and you told me to "seek help" (your words). If I'm seeking help for insights from psychotherapy, you obviously don't think those insights are valid. Or you're just too ignorant to understand what you're saying, which seems likely.

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gazette1895ky t1_iwflnf9 wrote

Reply to How an engine works. by ooMEAToo

I was studying about this and discovered that gears do functions similar to levers, it is really amazing how one force acts on the other.

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weewillywinkee t1_iwflf7b wrote

Reply to How an engine works. by ooMEAToo

Did work experience at a Shell research centre back in the 90s, they had managed to produce a crystal piston chamber for watching the combustion process after many attempts and failed prototypes. Not thought about that for years!

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Riegel_Haribo t1_iwfl47l wrote

Reply to comment by alx924 in How an engine works. by ooMEAToo

2014+ Ford 1.0L ecoboost also is a three-cylinder engine with direct-acting bucket camshaft. It, however, is dual-overhead-cam, and quite unusual in having a oiled timing belt, oil-powered variable valve timing, belt-driven oil pump, and over 200% the power output of a Geo.

Here's a video with multiple angles of internal engine operation: https://www.youtube.com/watch?v=IFj5UIZx2cE

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