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Old 26th November 2006, 23:01   #1
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Smile Power Valve

I am a mechanical engineering graduate. During my course we studied about 2-stroke and 4-stroke engines. While two stroke engines does not have a valves while 4-strokes rely on valves.

But the technology seems to have changed, atleast i can understand from a fellow bhpian as mentioned below:

http://www.team-bhp.com/forum/motorb...tml#post328408

now can any one tell me about power valves?
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Old 27th November 2006, 01:58   #2
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Exhuast Power valve is a device that alters the exhuast port height in 2 stroke engines ...gives a wider power band. YPVS and KIPS are 2 systems used by Yamaha and Kawasaki respectively .
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Old 27th November 2006, 03:11   #3
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Quote:
Originally Posted by Mpower View Post
Exhuast Power valve is a device that alters the exhuast port height in 2 stroke engines ...gives a wider power band. YPVS and KIPS are 2 systems used by Yamaha and Kawasaki respectively .
so, does that mean the power valves actually are not the main things for the 2-stroke engine breathing, instead they are an enhancement.
infact the ports are still the nose .
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Old 27th November 2006, 11:25   #4
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Power valves are also used on most modern technology 2stroke carburaters where extra fuel is supplied thru them when fiercely accelerating/whenever may be needed.
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Old 28th November 2006, 20:29   #5
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CBR the device that you talk about is an acclerator pump carb.
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Old 29th November 2006, 14:49   #6
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Quote:
Originally Posted by Mpower View Post
CBR the device that you talk about is an acclerator pump carb.
Power jet sorry.Not power valve

YEs its called accelerator pump for 4strokes and a powerjet for 2strokes.
JUst realised after googling

http://www.apriliaforum.com/techtips...NALSYSTEMS.pdf
Quite an interesting link explaining this sort of carb.
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