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johnson_united t1_iwg5bhs wrote

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

Intake - piston travels down to pull in air/fuel mix; compression - piston travels up to compress mix; power - mixture ignites, forcing piston down; exhaust - piston travels up to force out exhaust; process starts over.

Exhaust cycle for the valve timing seems a little bit off, but it’s close.

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bill_gannon t1_iwg6jix wrote

Lol it's way off.

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johnson_united t1_iwgbhre wrote

You’re right, I slowed it down. Exhaust is opening at BDC, usually it’s cycle is 100-5 degrees BTDC.

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Aggrador t1_iwgil6q wrote

It is just a diagram after all, not a precision-built machine, so I don’t think we can expect much in terms of ultra-realism. There are other things wrong with it, too, like no valve overlap, and the firing order has a noticeable lag between cylinders 1 and 3, makes for a very unbalanced engine.

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illBro t1_iwgqbup wrote

It would be easier to make it correct in a diagram vs real life.

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Aggrador t1_iwgso6i wrote

It would be easier, but it’s not super critical either. This gives you a general idea of how a 4-cycle engine works. All I was trying to say is you could pick it apart and find everything wrong with it, but at the end of the day, it is just a diagram. But yeah, i agree, it would be easier to make in a diagram vs real life.

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