ra12r
Zone Head
Posts: 919
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posted June 10, 2002 07:02 AM
Full time Vaccume Pump!
I have connected my crankcase ventilation system tube to the kleen air system in place of the connection to the air box. The air box holes are blocked now. So the kleen air pulls from the crankcase. But, based on the way that the system functions, what needs to be done to create vaccume all the time?!
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All must bow to the "Ra Supremecy"...
  
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zx12richard
Pro
The Green Monster..
Posts: 1133
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posted June 10, 2002 07:29 AM
Bet thats a touchy subject....LOL
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pat830
Expert Class
Posts: 135
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posted June 10, 2002 07:43 AM
Whatever you do......
......do not marry it. All vacuum will cease and desist at that time. 
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psycho1122
Pro
Posts: 1608
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posted June 10, 2002 07:46 AM
Could anybody elaborate on this topic in detail about the pro's or con's on this mod!?
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You say PSYCHO like it's a BAD thing!!
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ZXtra
Expert Class
Posts: 490
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posted June 10, 2002 06:23 PM
ra12r...There has been some discussion about this very subject on "another ZX12 board", and some there have actually done the mod. They are looking to reduce crankcase pressures and thereby increase horsepower. Another benefit I can see is a possible elimination of the crankcase wiring harness oik leak.
The kleen air system actually only produces vacuum at high intake manifold pressures because it is controlled by a vacuum sensing valve above the valve cover. If you want vacuum all the time, I would think you would just bypass the valve and hook 1 hose directly.
I haven't seen any dyno runs to prove a power increase, but the theory is good.  -ZXtra
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The sixth sick sheik's sixth sheep's sick!
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frEEk
Administrator
ummm... yeah
Posts: 9660
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posted June 10, 2002 06:54 PM
i got one problem with that theory, and it's the fact that it ignores the upstroke. sure lower presure would help bring the piston down easier, but u'v lost the pressure assist of getting it back up. of course this may not be the benefit everyone's talking about, so i may be full a crap. another issue (probably only theoretical in scale tho) is leakage. stands to reason that u'd lose more pressure thru ring gaps with lower crackcase pressure. but again, that may be such a small factor that it makes no difference. i kinda suspect the same would be true of the first theory too.
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ra12r
Zone Head
Posts: 919
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posted June 10, 2002 08:27 PM
What I am asking is,,,,,With the kleen air system connected as normal, what activates it?! Low engine rpms or high engine rpms?! OR Is the kleen air sucking when idling or at higher rpms?!
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All must bow to the "Ra Supremecy"...
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krexken
Zone Head
Posts: 732
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posted June 10, 2002 08:31 PM
As long as the reeds can suck more than the rings leak by at all times, it should be a benefit. Better ring seal and reduced crankcase pressure to allow the pistons to go up and down easier are the main benefits. A good vacuum/pressure gauge connected to the crankcase where you can see it all the time may give you some clues how good it is actually working.
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ZRXDean
Needs a job
Posts: 2225
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posted June 11, 2002 01:18 PM
I know the Prostockers all use these... Angelle's is supposed to be a massive sucker, so to speak.
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BA
Pro
Posts: 1592
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posted June 11, 2002 02:01 PM
Dammit, I'm getting Alzheimers!!!
DEAN'S RIGHT! The external pump is the mad-fatty way to go for the full benefit.
RA12, I did mine last summer/fall the same way that you have your's now. I didn't see any improvement in ET or MPH at the track, but, I like knowing it's done. Maybe I'll get one of those pumps one day.
If I remember correctly, here is how it works:
(I bought a mini-vacuum pump from Sears to do this test)
I have heard that the REED valves open up under increased air-flow. ie. Higher RPMS. Anyone can feel free to correct me if that's wrong!!
The Kleen Air canister though, is modulated by Engine Vacuum, assuming you still have that smaller pencil-sized hose connected to it. The other end of that small hose goes to the throttle bodies I believe.
Generally, the vacuum supplied there would be higher at partial throttle openings and ZERO vacuum on wide open throttle. (regardless of RPM)
I may be way wrong on this last part here, but my memory is telling me that the Kleen Air canister was ONLY opening when there was 10" vacuum and above applied to it!!
I'm sitting here now thinking, DAMN, I hope that's not right! (it might have been opposite of that)
Shit, I can't remember!
If my initial thought is right though, then doesn't that mean that during WOT, and zero vacuum, that my canister is "closed", and I have no throughput to my exhaust at upper RPMS??? Man that would SUCK! (or, not suck as the case happens to be!!...)
I'm going to have to go and test this again now! I'm going crazy with curiosity!!
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted June 11, 2002 04:47 PM
The valve opens and permits air to flow from the airbox thru the valve and past the reeds into the exhaust ports under full throttle like conditions.
This makes the valve a normally open valve.
The Vacuum closes the valve.
So I suppose the valve at times is partially open?
An added bennifit to a nice vacuum pump like that one above is when the rings are sealing very good the pump works even better.
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