What is the difference between a 2 stroke and 4 stroke engine - Team Camaro Tech
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post #1 of 18 (permalink) Old Jan 1st, 05, 03:38 AM Thread Starter
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I know that this may seem like a very stupid question, but as many of you already know, I am not a mechanic and beyond basic tune-ups, my knowledge of motors is somewhat limited.

Can anyone explain this to me?

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post #2 of 18 (permalink) Old Jan 1st, 05, 03:49 AM
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This people know better english than me, so I'll let them explain. [img]graemlins/beers.gif[/img]
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post #3 of 18 (permalink) Old Jan 1st, 05, 06:11 AM
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My wife thinks it's a sex thing....

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post #4 of 18 (permalink) Old Jan 1st, 05, 07:02 AM
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Did that link help, Garfield?

All engine require "intake" "Compression" "power" & "exhaust"

Basically, a 4 stroke requires 2 complete revolutions of the engine to produce 1 ignition and power stroke. Each "cycle" above gets ~180 degrees of crank rotation.

In a 2 stroke, compression sorta happens in the crankcase. The fuel/air mix is actually working both above and below the piston. Thats why you hafta mix oil with your fuel. Intake and exhaust happen simultaneously, and the plug fires every time the piston reaches the top of the cylinder.

2 strokes have the potential of producing way more power than 4 strokes (all else being equal) but they also dump a lot of unburned fuel out the exhaust, and when "tuned" for max power, typically operate in a very narrow rpm range.





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post #5 of 18 (permalink) Old Jan 1st, 05, 07:22 AM
 
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Unless they are Gimmy Diesel type motors that are super/turbocharged!! They are built more like a 4-stroke motors, but operate on the 2-stroke cycle...

They have four valves per cylinder and intake ports down at the bottom of the cylinder so that the super/turbocharger can purge the exhaust out the valves before she fires direct injection at about top dead center.

They are big heavy monster motors that are used in Big-Rig trucks and not small like the regular, "weed-eater/boat-motor", 2-strokes!!

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post #6 of 18 (permalink) Old Jan 1st, 05, 08:36 AM Thread Starter
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This info you guys all provided helped me understand a lot better than I did before..Thanks everyone [img]graemlins/thumbsup.gif[/img]
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post #7 of 18 (permalink) Old Jan 1st, 05, 09:42 AM
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Now look at the rotory engine and see if you are confused. This thing is an awsome piece of engineering. Only three moving pieces, the two rotors and the esentric shaft.

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post #8 of 18 (permalink) Old Jan 1st, 05, 10:43 AM
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For me, growing up riding motocross, there's nothing like the smell of a properly running 2-stroke motorcycle exahust. Weedeaters and chainsaws don't count.


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post #9 of 18 (permalink) Old Jan 1st, 05, 04:27 PM
 
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He, He!! An old AT, DT or RT-1 Yammmmi-hammer was music ta the two stroke guys as was a the Ossa Stilleto!

And don't forget the Ace and Super Rat little bikes.. And the Suzuki X-6 Hustler, too...

And onna hardest running ones going for the time was the 500 Kow triple. The old RD-350 and 400 were fast too..

I know I've left out a bunch of them too.....

They got killed off b/c of the Clean Air Act of 1972...

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post #10 of 18 (permalink) Old Jan 1st, 05, 06:02 PM
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Quote:
Originally posted by pdq67:
The old RD-350 and 400 were fast too...
They got killed off b/c of the Clean Air Act of 1972...

pdq67
They sure were fast, but they kept selling them 'til 79, I had an RD400 like this one, but in gold color. web page

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post #11 of 18 (permalink) Old Jan 2nd, 05, 06:36 AM
 
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Like I said, the CAA of 1972 killed them off!! Took a while BUT they are ALL gone, none-the-less!!

And the latest amendment to the CAA Amendment of 1990 will kill off what's left of the 2-stroke motors if not mistaken.

Notice you can now buy 4-stroke weed-eaters???

BUT it's really funny that by EPA definition, a Diesel/Electric configured vehicle is not a "hybrid vehicle" like a Honda insight or Toyota Prius??

Probably b/c a diesel/electric hybrid just might get a 100 mpg running in steady state rpm conditions driving down the road using a variable transmission like they have out now!!

And after Cali. gets through going over the new Particulate Matter 2.5, (PM2.5 NAAQS air quality standard), small diesels just may disappear too!!

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post #12 of 18 (permalink) Old Jan 2nd, 05, 03:34 PM
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Quote:
Originally posted by pdq67:
Notice you can now buy 4-stroke weed-eaters???
pdq67
and you can get 4 cycle lawn mowers, and 4 cycle outboard motors, and pretty much everything else !!

I remember my Dad bought one of them "new" 4 stroke Honda outboards when they first came out in the early 80's. It was a 10 horse and weighed at least twice what the old 2 stroke 9.9 Johnson did. Didn't rev like the Johnson either . . .

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post #13 of 18 (permalink) Old Jan 2nd, 05, 04:03 PM
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I'm gonna miss the 2 stroke snowmobiles... Ani't never heard nuttin that sounded like the polaris 600 triple I used to have, at 8000 rpm!





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post #14 of 18 (permalink) Old Jan 3rd, 05, 02:53 AM
 
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Same way with the old 500 Kow triple at speed..

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post #15 of 18 (permalink) Old Jan 3rd, 05, 04:35 AM
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Oh my, don't even remind me of those... buddy had the 750, quickest bike I ever road, including another buddy's KZ1000 w/ turbocharger, 6" slick, and wheelie bars!





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