Venturi vacuum pump - Page 5

sleepydsm · 03-18-2008

so basically a vaccum port in the exhaust, lets say downpipe, hooked to your catch can, which will help "suck" out the crankcase pressure.

turbotalon1g · 03-18-2008

yep pretty much, the angle on the port determines the "venturi" effect on the gases.

blageo23 · 03-18-2008

Quote:

Originally Posted by Andrew7dg

Wasn't this why iceminion was band for a little bit because of promoting his product?

No, he got banned because I paybanned him for being a little bitch about this product.

FattyBoomBatty · 03-18-2008

Quote:

Originally Posted by turbotalon1g

yep pretty much, the angle on the port determines the "venturi" effect on the gases.

It just has to be facing "downstream" I think, so that there is a low pressure area around the opening as exhaust flows past it. I think almost any angle would work, except when you're getting close to perpendicular, which would inhibit exhaust flow more as well. 45 degrees sounds good to me. and the nice thing about that is that oil vapors that escape will be burned or at least deposited in your muffler for use later.

turbotalon1g · 03-19-2008

word son.
Now that i have a welder this could actually happen rather than the ghetto hose to the ground.

**JET** · 03-19-2008

One thing that popped into my head about the original design. At idle it is going to be sucking air past the throttle body that shouldn't be going in there. There is a direct link to the intake since the manifold will be under vacuum.

HiImBrian · 03-19-2008

Well I just re-read this thread twice and I don't think I've learned so much at one time before! I vote this most informative thread on style for quite a while. I would like to clear a few things up for other newbs including myself in this situation.

The first pic is of somebody with just a filter on their vc. This is bad because it allows air to get sucked back into the vc.

The second pic is a setup with a simple catchcan/filter that goes on the line from the vc to the intake.

My understanding of the Krank Vents is that one goes on by your pcv valve and acts as a backup making sure no air gets into the vc, and the other goes on a line from the vc to the intake sucking some air out but again not letting air back in. You would also want to use a catchcan/filter on the line going from your vc to your intake.

I'd appreciate it if somebody could edit my post and correct anything that's incorrect. It may be a little late for this post, but I'd like to think I'm helping out some future newbs we might direct to this thread.

tpunx99GSX · 03-19-2008

Holy jebus, look at all those blue lines. LOL

HiImBrian · 03-19-2008

Quote:

Originally Posted by tpunx99GSX

Holy jebus, look at all those blue lines. LOL

yea i searched for like 15 pages after I saw that because it's kinda hard to see and the blue just hurts my head. Sadly, that's the only car in the first 15 or so pages of tuners that has that little filter on it. 90% of the people just run a line from the vc to the intake. I'm doing this right now, but after reading all this I'm just waiting for a solid conclusion to what I should do.

**Kracka** · 03-19-2008

In order to stop cluttering up this venturi thread with KV-related info I am going to quote and respond to your post in my thread.

FattyBoomBatty · 03-19-2008

Here's what I think would be the best "simple" way to install this. One might even go as far as adding a catch tank between the breather and exhaust check valve so as to keep oil out of the exhaust if possible. I also don't know how well the drain tube from the catch can to oil pan would work, but my stock oil catch can does that so I think it would work.

**Halon** · 03-19-2008

Some of the stuff I've seen build up at the bottom of catch cans, I don't think I'd want all that stuff returning to my oil pan.

**Kracka** · 03-19-2008

Quote:

Originally Posted by Halon

Some of the stuff I've seen build up at the bottom of catch cans, I don't think I'd want all that stuff returning to my oil pan.

Agreed.

FattyBoomBatty · 03-20-2008

Yeah, actually I was looking at scheides' picture earlier and saw some gunk, but that's why I mentioned something about it. So, no return line.

sleepydsm · 03-20-2008

Quote:

Originally Posted by FattyBoomBatty

Here's what I think would be the best "simple" way to install this. One might even go as far as adding a catch tank between the breather and exhaust check valve so as to keep oil out of the exhaust if possible. I also don't know how well the drain tube from the catch can to oil pan would work, but my stock oil catch can does that so I think it would work.

Wouldn't you want a catch can in between the vent and the intake?

sleepydsm · 03-20-2008

Would some sort of electrical vaccum pump be practical? Seems like exhaust nipple would be the easiest, most reliable.

Pushit2.0 · 03-23-2008

If you buy a factory pump made for this application it would be just as reliable as any other pump on the car.

~John

FattyBoomBatty · 03-24-2008

Quote:

Originally Posted by sleepydsm

Wouldn't you want a catch can in between the vent and the intake?

Well, the PCV goes to the intake normally, so that's why it's going there now, and in all of the KV setups I've seen, that is how it's done. I suppose you could hook up both ports on the valve cover to the catch can and only one vacuum source, but either way, it's good to have two different source for vacuum, if possible.

Anyway, as long as there is a vacuum, both the pcv and vent will see that vacuum, doesn't really matter where you get it, as long as there's a check valve.

**Halon** · 03-24-2008

Pretty sure he meant a 2nd catch can that goes between then intake and the VC.

FattyBoomBatty · 03-25-2008

Pretty sure you need to take a step back, cause you're standing on my dick.

I know what he meant, why the hell would you have both the pcv AND breather/vent going to the intake, catch can or not? The idea is to have alternate sources of vacuum so the crank case is under vacuum as much of the time as possible.

I already suggested above my picture I drew that a second catch can between the vent and check valve going to the exhaust nipple wouldn't be a bad idea.