PCV into thottle body- Mistake?

[toocrazy2yoo]

Why must they dump the PCV gasses straight into the throttle-body? There's nothing between the PCV valve and the throttle body, it just dumps right in. Isn't that the sole source of goo and sludge there? In carb-aspirated vehicles, they routed it into the air filter box, why not nowadays?

Would there be ill effect re-routing it to the airbox? It would be a simple mod to thread a fitting and grommet to the box below the filter and move the line.

Just curious?

 

[Drew99GT]

Perhaps they do that because the highest vacuum is gonna be right before the throttle blade. Better suction to pull out crankcase vapors. More environmentally friendly

 

[boxcartommie22]

my pcv catch can works great to filter those gases i got this one from accurate machine..had this for 2 years now

 

[toocrazy2yoo]

Hmmmm...even if the fresh air supply to, and the pull toward the throttle body from were both from the airbox, wouldn't you still be moving air through the crankcase? It's pressure below ambient, why would't you still be circulating air through the crankcase?

Could you filter the PCV gasses through, I donno, some kind of a fuel filter, or something free-flowing to catch some of the nasty stuff? Catch can? They sell those?

Thanks!

 

[JTK]

That might work for some engines. I think most need a good vacuum to sweep out the crankcase gasses. Otherwise you'd have a milky mess going on.

Joel

 

[eljefino]

At WOT the PCV system expels blowby through both hoses.

At less that WOT there's vacuum that draws in the fresh air tube upstream of the throttle blade, it mills around beneath the valve cover(s) then goes through the PCV valve and dumps into the intake manifold downstream of the throttle.

There are two issues:

WOT gases hitting the throttle blade and adjacent idle speed controller, gunking that up.

Normal gunk winding up inside the intake manifold, narrowing the passages like chloresterol.

The throttle body gunking up is what bothers most people. Pulling the fresh air hose and putting some sort of filter or catch can here helps. Reconnecting the catch can to the original barb is more legal than just letting the other end drip.

A catch can between the PCV and intake is another possibility, and one can do two if it pleases them.

With the fresh air hose ending still within the intake tract, odds of fumes escaping to the atmosphere are lessened which makes the EPA happy.

 

[toocrazy2yoo]

Thanks, EL..

Now, what's a catch can? Something devised, or something purchased?

 

[toocrazy2yoo]

Thanks, EL..

Now, what's a catch can? Something devised, or something purchased?

 

[GoldenRod]

http://www.accmachtech.com/pcvcatchcans.htm

 

[JTK]

PCV has to be ported behind the throttle plate otherwize there wouldn't be much ventilating going on! The breather side is ported to a non-vac clean air source upstream of the throttle plate.

Joel

 

[mechtech]

This is why many install catch cans in their PCV systems.
Like me!

 

[qadsan]

quote:

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Originally posted by toocrazy2yoo:
...Could you filter the PCV gasses through, I donno, some kind of a fuel filter, or something free-flowing to catch some of the nasty stuff?...

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