Kleen air/PCV

vmaxwayne · Mar 3, 2003

After reading Blitz's excellent article on Kleen air removal and PCV mod, I started to read the section on Kleen air in the service manual.

For my novice eyes it appears that the vacuum at the stacks between the airbox and the engine inlets controls the Kleen vaccuum valve which allows air to flow through the reed valves into the exhaust.

If you remove the Kleen system entirely and route the PCV line to the reed valves then there should be suction at this point all the time (when the engine is running) with no control by the vacuum valve. This valve appears to stop counter flow from the exhaust back into the airbox which it would also do if the PCV was routed through it.

This is a bit rambling but the question is??? Is it better to leave the vacuum valve in place and route the PCV line to the inlet to the vacuum valve assembly??

Blitzkrieg · Mar 4, 2003

Well, I thought I understood your question in the PM you sent to me, but after reading this post maybe I'm confused?

I guess I dont follow exactly what from the kleen air pump you want to hook up and to where.

Also, do you have a zx-9 manual, because the 12 manual I have (2000-2001) says refer to the 9 manual for detailed Kleen Air info.

ddub · Mar 4, 2003

This is what I did with my ZX-7R , cost was about 60cents from sears hardware , reeds are still in it , works great , and they did not melt , after running it at the strip last summer , very hot and humid , just some thing to look at :wink:

Venom · Mar 4, 2003

Vmax no it will not back flow. Theres a reed valve in there that would stop any neg presure pulses.

bl12r · Mar 4, 2003

:roll: :roll: :roll: :roll:

vmaxwayne · Mar 4, 2003

Blitz:

As I understand the working of the Kleen air system, it draws vacuum from the throttle bodies to actuate to actuate a valve, this valve when open allows air to flow from the high pressure air box to the low pressure reed valve inlet.

When the pressure is low in the throttle bodies the valve is closed and so there is no flow to the reed valves.

Seems like a complicated system if the reed valves are truely one way. My thought is that the actuating pressure of the vacuum valve may be such as to open only when the throttle body pressure drops to a certain point (rpm), which may be what causes the idle hunt.

If the reed valves are good enough then routing the PCV line directly w/o the vacuum valve in place should relieve the pressure in the crank case and add some flow if the pressure in the reed valve is low enough, which from some earlier comments about vacuum being released when opening the oil cap seems right.

Anyway thanks for listening to a novice, I'm going to try the direct connection and see how it goes.

Many thanks

Wayne

Kleen air/PCV

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