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Tractor Talk Discussion Forum

Stroke

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Martin

08-22-2004 14:59:51




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I have heard engines described as 2 stroke, 4 stroke, and sometimes even 7 stroke, what does this mean?




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Allan in NE

08-23-2004 09:07:15




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 Re: Stroke in reply to Martin, 08-22-2004 14:59:51  
Well Okay then,

How many strokes would you define a hit/miss engine? :>)

Allan



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Martin

08-23-2004 09:55:01




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 Re: Stroke in reply to Allan in NE, 08-23-2004 09:07:15  
I hear hit 'n miss engines are 2 stroke, the 7 I mentioned is actually a radial engine, anyway, thanks everyone for you replys!



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wilson

08-22-2004 19:51:40




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 Re: Stroke in reply to Martin, 08-22-2004 14:59:51  

There is an 8 stroke which is really a 4 stroke with 2 rounds valves open for air cooling Its weird and I have only seen 2 of them at shows



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Hugh MacKay

08-22-2004 19:26:32




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 Re: Stroke in reply to Martin, 08-22-2004 14:59:51  
Martin: I think you have been given very good descriptions on the 2 and 4 stroke cycle engines.

I'm kind of curious where you heard of this 7 stroke engine? I'm not trying to poke fun, just curious. I can maybe see that applyng to a radial engine.



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MMB

08-22-2004 18:29:11




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 Re: Stroke in reply to Martin, 08-22-2004 14:59:51  
Actually, every "stroke" is one-half of a full revolution of the crankshaft, for example a 4-stroke engine is really two full revolutions of the crankshaft .... the intake is one-half of a revolution, followed by the compression, followed by the power stroke (after the fuel/air mixture is ignited), followed by the exhaust stroke. In a 2-stroke engine, things are generally condensed somewhat with a lot of overlap. The first stroke (1/2 revolution) combines the last power stroke with an intake stroke (of the next sequence), while the second stroke (1/2 revolution) combines the last power stroke with the next intake stroke. Two stroke engines are usually less efficient with their exhaust emmissions being somewhat less environmentally friendly since less of the fuel being delivered into the system gets totally burned during the power stroke (and is into the exhaust of the exhaust stroke). That's the reason why so many lakes, etc. ban 2-stroke boat engines since so much unburned fuel is expelled into the water.

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720Deere

08-22-2004 15:33:43




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 Re: Stroke in reply to Martin, 08-22-2004 14:59:51  
A Four stroke engine makes 4 piston strokes for every complete cycle. 1. Intake 2. Compression 3. Power 4. Exhaust

Two Stroke engines combine the intake/power strokes and the compression/exhaust strokes.



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Joe (Wa)

08-22-2004 15:27:51




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 Re: Stroke in reply to Martin, 08-22-2004 14:59:51  
Internal combustion engines have four evolutions:
Intake, compression, combustion, and exhaust. Depending on the design of the engine this can be accomplished in either two or four piston strokes I.E. 2 stroke cycle or 4 stroke cycle.



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