Kenne-Bell guys: what do you do about PCV?

[BlackVert]

In a centrifugal blower setup, the vacuum generated by the motor doesn't change. More air is forced through the inlet track, which has its own challenges, but at least the vacuum generated by the motor doesn't change.

But in a Kenne-Bell setup, since the blower is after the vacuum hoses, it must generate alot more vacuum than a stock motor, especially when the throttle is closed.

I think that all this extra vacuum is causing much more oil to be sucked through the PCV system than before, which is causing me to lose oil.

You other K/B folks, what do you do with your PCV?

Can I just connect my PCV hose (11/32") to a smaller vacuum inlet to decrease the amount of vacuum the PCV gets?

Or should I go "Passive" and just vent the PCV to the engine compartment?

Or is an oil seperator my only choice?

 

[Cobra_Dusten]

My PCV is run like this, i didnt have any oil issues until my rings became worn...
I get some oil blown into the air intake, the problem i am having now is the s/c pushes past the rings and over pressurizes my crankcase, and is also blowing oil out the dipstick, but that is all beside the point. Before the ring issues, i never had any problems. I also have about 12 pounds of vacuum on my boost gauge at idle, it goes 20 when i let off the gas while driving.

 

[Killercanary]

Can't you plumb the PCV line in AFTER the blower? That's how I would think it would have to be done.

 

[nmcgrawj]

Can't you plumb the PCV line in AFTER the blower? That's how I would think it would have to be done.

I dont know much about KB's but wouldnt that give boost to the crankcase?

 

[Killercanary]

I dont know much about KB's but wouldnt that give boost to the crankcase?

No, that's the job of the PCV. It is "supposed" to act a valve that will allow gases to come from the crankcase and into the intake, but not the other way around.

 

[Cobra_Dusten]

No, that's the job of the PCV. It is "supposed" to act a valve that will allow gases to come from the crankcase and into the intake, but not the other way around.

That is the way i understood it too, unless he has a faulty PCV that is allowing air into the crank case

 

[BlackVert]

Can't you plumb the PCV line in AFTER the blower? That's how I would think it would have to be done.

the instructions from kb say to put it on the vacuum side.

 

[Killercanary]

I'd call KB and ask them then how the valave is supposed to stay closed when you put a vacuum being it trying to open it up. Maybe there is a heavier valve you could use or something.

 

[nmcgrawj]

No, that's the job of the PCV. It is "supposed" to act a valve that will allow gases to come from the crankcase and into the intake, but not the other way around.

Ahhh that makes sense. Seems like a lot of guys have problems with the pcv and boost applications. Seems like i remember reading a lot about it on turbomustangs. Arent there some older turbo cars that have the pcv valves you could use i think?

 

[Killercanary]

Yes, some guys run the turbo coupe/super coupe PCV's I believe. I think RC runs one and Joe used to too.

 

[Cobra_Dusten]

KB has a tech line, call em... www.kennebell.net

 

[a50sn95]

Yes, some guys run the turbo coupe/super coupe PCV's I believe. I think RC runs one and Joe used to too.

I run the turbo coupe one.
Stock PCV valves are steel seat and steel valve. Doesn't seal completely under boost.
The T-Coupe/Supra/SuperCoupe valves supposedly have rubber (or some similar material that aloows for a better seal under boost.