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| The Sweet Sound Of A Two Stroke http://kawi2strokes.com/forum/viewtopic.php?f=2&t=2128 |
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| Author: | Iron [ Mon Jan 16, 2012 9:38 pm ] |
| Post subject: | The Sweet Sound Of A Two Stroke |
Can anyone explain why a two stroke has this unique sound? Why is it so different from a four stroke? I have been wanting to know. Thanks. |
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| Author: | RODH2 [ Mon Jan 16, 2012 9:43 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
To get the ball rolling, and at the risk of over-simplification, quicker and shorter exhaust pulses,(the same could be said of the inlet side!) |
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| Author: | Ric [ Mon Jan 16, 2012 9:46 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
An ignition every cycle on the 2-stroke with that ignition being (in part) exposed to the exhaust port. While a 4-stroke has the exhaust port opened largely after the ignition has been spent. Ignition being the exploding gases. That is: the 2-stroke yields the popping sound of the explosion while the 4-stroke has more of a puffing sound of the fumes being pushed out being that the exposion pop has already taken place. My take on it anyway. Probably totally wrong...... 
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| Author: | ThreePipesSmokin [ Mon Jan 16, 2012 10:07 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
Ric wrote: An ignition every cycle on the 2-stroke with that ignition being (in part) exposed to the exhaust port. While a 4-stroke has the exhaust port opened largely after the ignition has been spent. Ignition being the exploding gases. That is: the 2-stroke yields the popping sound of the explosion while the 4-stroke has more of a puffing sound of the fumes being pushed out being that the exposion pop has already taken place. My take on it anyway. Probably totally wrong...... I'll buy that, and add that having ports rather than valves contributes to the sharp sound. No matter how aggressive the cam profile, a valve opens gradually compared to the sudden exposure of an opening port, especially the exhaust, giving us that sharp popping sound we know and love! 
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| Author: | porschedave [ Mon Jan 16, 2012 10:20 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
I kinda agree they can sound pretty good. |
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| Author: | evansje1 [ Mon Jan 16, 2012 10:31 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
Can anyone explain why a cajun guy has this unique sound? Why is it so different from all the other guys? I have been wanting to know. Thanks. Love U Man. 
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| Author: | Ja-Moo [ Mon Jan 16, 2012 10:37 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
That's about it, a 2 stroke EX port opens during the "burn"', and most 4 strokes open the valve after. You will notice drag motors with huge cams sound a lot like 2 strokes, and drag 2 strokes and very hot street 2 strokes, have a much louder "cackle", due to the EX ports opening sooner. |
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| Author: | Ja-Moo [ Mon Jan 16, 2012 10:41 pm ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
evansje1 wrote: Can anyone explain why a cajun guy has this unique sound? Why is it so different from all the other guys? I have been wanting to know. Thanks. Love U Man. You need to visit Cagun country.... they all sound alike, can't understand a word, but the sound is the same........ 
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| Author: | Jim [ Tue Jan 17, 2012 12:12 am ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
A big part of the 2-stroke sound is the failure to properly ignite the mixture every time, except when things get optimum. Even a stock triple sputters and misfires and blows half its mixture out the exhaust pipes when it's idling. Mild 4-stroke engines have plenty of time to complete each stroke's purpose. Not so much so with a 2-stroke engine. Our triple engines actually have the incoming mixture coming in the transfer ports at the same time the exhaust ports are wide open! My buddy who races hydroplanes once said "The more trouble an engine has running slowly, the cooler it is". Think about that. |
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| Author: | RODH2 [ Tue Jan 17, 2012 1:31 am ] |
| Post subject: | Re: The Sweet Sound Of A Two Stroke |
I know I'm not the first to refer to a H1/H2 as "petrol cooled engines"!
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