Power Valve

kkr2k2 · 26th November 2006, 23:01

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?

Mpower · 27th November 2006, 01:58

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 .

kkr2k2 · 27th November 2006, 03:11

Quote:

Originally Posted by Mpower

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

.

cbr1000f · 27th November 2006, 11:25

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.

Mpower · 28th November 2006, 20:29

CBR the device that you talk about is an acclerator pump carb.

cbr1000f · 29th November 2006, 14:49

Quote:

Originally Posted by Mpower

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.

26th November 2006, 23:01	#1
kkr2k2 Senior - BHPian Join Date: Sep 2006 Location: Melbourne, Hyd Posts: 1,294 Thanked: 66 Times View My Garage	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?
	() Thanks

27th November 2006, 01:58	#2
Mpower Senior - BHPian Join Date: Mar 2005 Location: Bangalore Posts: 10,409 Thanked: 1,729 Times View My Garage	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 .
	() Thanks

27th November 2006, 11:25	#4
cbr1000f BHPian Join Date: Sep 2005 Location: Mumbai. Posts: 148 Thanked: Once View My Garage	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.
	() Thanks

28th November 2006, 20:29	#5
Mpower Senior - BHPian Join Date: Mar 2005 Location: Bangalore Posts: 10,409 Thanked: 1,729 Times View My Garage	CBR the device that you talk about is an acclerator pump carb.
	() Thanks