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A good question for a cold Sunday afternoon

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Jim WJ

02-10-2008 12:07:17

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On a 4 cylinder 2 cycle diesel engine. How many times does it fire in 1 crankshaft revolution? Jim WJ

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JoshuaGA

02-10-2008 18:14:05

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

Thanks :D
JoshuaGA

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Ryan - WI

02-10-2008 18:00:07

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Re: A good question for a cold Sunday afternoon in reply to big red 1, 02-10-2008 12:07:17

JoshuaGA said: (quoted from post at 20:44:40 02/10/08) Alright then, how does a two cycle engine work? Are all the functions i.e. intake, compression, power, and exaust cycles half the stroke of the cylinder or have I missed something? Someone please explain. Thanks.

JoshuaGA

Josh,

I use the animations on this site with my small engines students. It explains and illustrates it much better than their textbook.

Link

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JoshuaGA

02-10-2008 17:44:40

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

Alright then, how does a two cycle engine work? Are all the functions i.e. intake, compression, power, and exaust cycles half the stroke of the cylinder or have I missed something? Someone please explain. Thanks.

JoshuaGA

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Bob Huntress

02-10-2008 18:36:44

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Re: A good question for a cold Sunday afternoon in reply to JoshuaGA, 02-10-2008 17:44:40

At the bottom of the stroke are scavanger ports. If you are looking at just the cylinder, the ports are about half way down the walls. When the piston reaches a point low enough on the stroke to uncover this ports, air is pushed into the cylinder from a blower, and/or turbo, and exhaust gases are pushed out the exhaust valves. As the piston begins to rise on the following stroke, the piston and rings seal off the ports, and the exhaust valves close. The piston continues to rise. the increase in pressure causes a rise in tempeture. Slightly before top dead center, fuel is injected into the extremely hot air, and begins to ignite from the tempeture of the compressed air. As the pisto begins the downward travel, the expanding gases push the piston down until the scavenger port are again uncovered. Scavenging replaces both the intake and exhaust strokes, leaving a power stroke, and a compression stroke. every time the piston travels downward, it is on the power stroke, while everytime the piston travels upward, it is on the compression stroke.

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MPK

02-10-2008 14:53:32

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

That is why on some of those old Detroit diesels they always sounded like they were screaming, firing twice as often as the other ones.

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old popper

02-10-2008 13:26:18

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

Don't know, all my tractors have only two cylinders. Cold Sunday afternoon, I'll say was in town at about 1:30, -6 farenhiet. I'll stay in by the puter the rest of the day.

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old popper

02-10-2008 13:26:02

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

Don't know, all my tractors have only two cylinders. Cold Sunday afternoon, I'll say was in town at about 1:30, -6 farenhiet. I'll stay in by the puter the rest of the day.

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comfortking

02-10-2008 12:57:22

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

There are four strokes to a four stroke engine. Intake is the first:this is the piston going from top to bottom with intake valve open, 180 degree turn of crank. Second is compression with piston coming to top with both valves closed, 180 degree turn of crank. Just as the piston nears the top ignition takes place either by spark plug or injector on a diesel. After the compression stroke the piston goes down on the power stroke with both valves closed, another 180 degree turn of the crank. At the bottom of the compression stroke the exhaust valve opens expelling the spent fuel as the piston comes to the top, hence the exhaust stroke also a 180 degree turn of the crank. Now we start over as the intake valve opens.
So to my estimation you get fire once every two turns of the crank on any particular cylinder. Each stroke is 180 degrees and there are 4 strokes Intake, Compression, Power, and Exhaust. Now the cam only turns once per the crank twice.

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john in la

02-10-2008 12:25:25

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

Sorry I do not feel 77° is cold but it is Sunday afternoon.

A cycle is one stroke of the piston. Up OR down. So a 2 stroke fires on every crank revolution. Does not mater how many cylinders it has.

So yes Gary. Just like a 8 cylinder 4 stroke fires 4 times per crank revolution.

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TRH

02-10-2008 12:17:22

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Re: A good question for a cold Sunday afternoon in reply to Jim WJ, 02-10-2008 12:07:17

All cylinders will fire in one revolution on a two cycle engine.

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Jim WJ

02-10-2008 12:25:34

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Re: A good question for a cold Sunday afternoon in reply to TRH, 02-10-2008 12:17:22

Thanks for the reply TRH. I figured it would help keep or mchanical minds in good working order on a cold afternoon. -22 this morning with lots of wind. Jim WJ

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IaGary

02-10-2008 12:21:59

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Re: A good question for a cold Sunday afternoon in reply to TRH, 02-10-2008 12:17:22

So if all cylinders fire once per revolution then a 4 cylinder will fire 4 times in one turn of the crank.

Gary

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Roger in Iowa

02-10-2008 12:51:33

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Re: A good question for a cold Sunday afternoon in reply to IaGary, 02-10-2008 12:21:59

Gary,

Has to be a two-cycle to fire four times in one revolution of a 4 cylinder.

Tractor 4 cylinders four-cycle would only fire twice in one revolution.

Roger in Iowa @zero, that is 0 degreeeees Fahrenheit right now at 3 p.m.

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IaGary

02-10-2008 17:39:16

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Re: A good question for a cold Sunday afternoon in reply to Roger in Iowa, 02-10-2008 12:51:33

My response wasn't a question.

I said a four cylinder engine will fire 4 times in one turn of the crankshaft. If it is a 2 stroke, as was asked in the orginal start to this topic.

Gary

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TRH

02-10-2008 12:47:34

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Re: A good question for a cold Sunday afternoon in reply to IaGary, 02-10-2008 12:21:59

"So if all cylinders fire once per revolution then a 4 cylinder will fire 4 times in one turn of the crank.
Gary"

That is correct. If it is a two cycle engine it doesn't matter how many cylinders it has (1,2,3,4,5,6 etc) they will all fire in one revolution.

On a four cycle engine it takes TWO complete revolutions to fire all respective cylinders.

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