My new crankcase evacuation system

[Calan]

And the catch can should catch most of the oil.

We're hoping.... as long as that beast doesn't suck the filters, lines, and everything else into the turbo inlet through that -12AN line.

 

[1995gsx20g]

I have come to expect nothing less from your threads. If you ever post one in which you dont re-invent the wheel in some way I am going to be very disappointed.

As always you have done an impressively clean job with that set up, as well as your whole engine bay. its rare anymore that I bother to pick up a import rag,( lets be honest most of them are crap) but I cant think of many cars more deserving of a build feature than your dsm. You have done an amazing job with every part of this build. Keep at it!

If there were ever a dsm i would kill for....

+1 i couldn't have said it better myself.

 

[PieEyedPiper]

I still think that in order to take advantage of scavenging/vacuum you ought to have the fitting facing the direction the air is going, rather than the direction that the air is coming from. I'd have just thought facing a cup into the wind will create positive pressure, not the desired effect.

 

[99gst_racer]

I have come to expect nothing less from your threads. If you ever post one in which you dont re-invent the wheel in some way I am going to be very disappointed.

As always you have done an impressively clean job with that set up, as well as your whole engine bay. its rare anymore that I bother to pick up a import rag,( lets be honest most of them are crap) but I cant think of many cars more deserving of a build feature than your dsm. You have done an amazing job with every part of this build. Keep at it!

If there were ever a dsm i would kill for....

Hey, thanks man.
Much appreciated.

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Just curious why you don't have the hose going to the exhaust rather than the compressor inlet? If I'm thinking about this correctly then you are going to also be pushing oil through this hose when the crankcase is under extreme pressure which will then go through the intake and possibly cause ignition issues. On my camaro we ran these hoses down the headers so any oil sucked through would just cause a little blue smoke but not be pushed through the cylinders.

Hey Cedric,
I chose not to use the exhaust due to it's limited ability to scavenge. I know it works well on naturally aspirated V8 cars and whatnot, but I have yet to see good data showing it works well on a DSM. In fact, most guys that have tested, weren't even able to pull a full inch of vacuum using the exhaust. I attribute that to the reason I posted in post #18. There was actually a pretty decent thread over on NABR about it a couple years ago. Might be worth checking out next time you're over there.

The catch can that I'm using filters out particles out below 1 micron, so I shouldn't have to worry about the turbo sucking in anything but filtered air. And with the valve cover baffling in place, I don't expect to be seeing oil accumulating in the can at a very fast rate.

 

[99gst_racer]

I still think that in order to take advantage of scavenging/vacuum you ought to have the fitting facing the direction the air is going, rather than the direction that the air is coming from. I'd have just thought facing a cup into the wind will create positive pressure, not the desired effect.

The incoming air must enter the "slit" and exit to help create the scavanging effect that I'm after. Vibrant Performance offers a similar fitting to be used in the exhaust system. And theirs is to be used the same way - slit facing forward.

The cool part is that I am able to spin the bulkhead around 180*, so I will be able to test it both ways. But I'm very confident that I'll see the best results with how it's currently sitting.

 

[turbobrian]

I also would think you could get more vacuum with the exhaust than intake. the intake is barely moving air and the exhaust is flowing lots of air.

 

[PieEyedPiper]

Just remembered you were going to log/setup a MAP sensor. I'll be patient and wait for the logs.

I also would think you could get more vacuum with the exhaust than intake. the intake is barely moving air and the exhaust is flowing lots of air.

How is the intake not flowing lots of air? When you're flowing 50lbs/min that air has to flow through the intake pipe.

 

[turbobrian]

Does it really suck 50 lbs a min? The wheel pushes that air but does it suck it at that rate? I do not know the answer. Maybe i'm wrong?

 

[99gst_racer]

I also would think you could get more vacuum with the exhaust than intake. the intake is barely moving air and the exhaust is flowing lots of air.

Scavenging mostly works off of a pressure differential, so speed is more important than mass. The air in the intake pipe is hauling ass at full spool, and exhaust isn't traveling quite fast enough (relative to it's diameter) - especially after traveling through two turbine housings.

But there's definitely some vacuum in the intake pipe once the turbo starts spooling (which coincidently, is when we need crankcase evacuation the most).


I took this video with my Blackberry. This shows just how well a turbo can suck.

YouTube - Pre-compressor water injection

 

[turbobrian]

ahhh ok I really didn't know it had that much flow. Looks good. I bought the same catch setup with his first couple last year and have yet to install it. Looks like we finally have a winning set up here. Great write up.

 

[Calan]

ahhh ok I really didn't know it had that much flow. Looks good. I bought the same catch setup with his first couple last year and have yet to install it. Looks like we finally have a winning set up here. Great write up.

Was wondering if you ever got those installed.

Paul... any updates on when you'll be up and running and doing some testing?

 

[turbobrian]

Was wondering if you ever got those installed.

Paul... any updates on when you'll be up and running and doing some testing?

No never got around to it because I didn't like how I set it up. I got the catch with with just 1 -10 on the top. I should have had you make a duel inlet on the top like the one on this thread since I have 2 -10 off my valve cover. If anyone wants a -10 in and -10 out I will swap and cash for a dual.

 

[99gst_racer]

Paul... any updates on when you'll be up and running and doing some testing?

Soon. I just pulled the t-case last night to replace the seal for the yoke. I'll put it all back together tonight and fire it up. And long as the new thermostat helps keep the coolant temps in check, I'll try to get some datalogs this weekend (weather permitting).

I still need to figure out how to test a MAP sensor to see if it still functions. (Any ideas?) And if my spare is OK to use, I'll hook it up for the evac set-up.

 

[snowborder714]

Why not just hook it up and run with it to see if it works?

If not, maybe hook up a multimeter and then put a nipple on the other end with some vacuum line and use your compressor?

 

[99gst_racer]

Why not just hook it up and run with it to see if it works?

That's probably what I'll do. It's a 3-bar that I used with an electric boost gauge years ago, but it just up and quit working one day, and I never did figure out if the problem was with the gauge itself or the MAP sensor.

What's the best pin to wire it into for V3? As of right now, I'm only using the MPD and rear O2 pins.

 

[snowborder714]

I have mine wired into the MDP input. But if that's in use for you, then you only have the IAT left.

You can use the coolant temp input as a temporary solution (have to lock car in open loop). If you're using narrowband sim, you can use the front o2 sensor as a permanent solution. And to use the baro input, you'll need to have the buffer circuit (or if you have the GM MAF cable you can use the baro input on there).

 

[crash89]

Hey man, everytime I see one of you threads it alwasy blows my mind the shit you make! Mad props to you!!

However, Im still on a learning level here and just cant seem to figure out the reason for the catch cans. I kinda cought on that what you made here will relieve crankcase pressure and supply fresh air during vacuum. But is there really that much oil that is sent through the stock fitting there on the VC that goes to the intake? I guess what Im asking is what do these catch cans really help with?

 

[AK Maniak]

your engine bay is gorgeous

 

[Calan]

But is there really that much oil that is sent through the stock fitting there on the VC that goes to the intake? I guess what Im asking is what do these catch cans really help with?

You would be amazed.

I'm still running my original prototype version of the can with the single inlet and filter, though a -6AN inlet and outlet. I collect about 1 quart of nasty oil and blowby every 5000 miles or so.

And this is on a newly built motor with stock VC baffles, good rings, and only 20-24psi of boost. Now translate that to a worn motor, or a beast like Paul's that is pushing 40 psi of boost.

Yes...decent catch cans hooked up properly will definitely help.

 

[99gst_racer]

Thanks again, guys.


I got it all set to datalog. I just need to wire it up.

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[TSIfreek]

Good Idea on the above paul. Looking forward to the results.
I run the exact same set up but I have the lines going directly into the side of the turbo intake but im still using the baffles. I ended up drilling and taping for small screws and JB weld to hold it in place.
Im also still using the stock PCV system also another reason I kept the baffles.
Its working great for me so far no oil in the intake pipe and better yet no oil leaks from blown out gaskets.
It takes alot of time to do it all right though. That baffle FN sucks

 

[-red97rum-]

Very nice work. I'm re-thinking my whole crankcase evac system now that I've started my HX35 install. I may do something similar with a spare valvecover I have. Thanks for sharing.

 

[turbobrian]

Any results?

 

[99gst_racer]

Any results?

Not yet. The car has been down for the past 10 days due to a dampner issue. But, I should have it up and running again by tonight, and I just picked up an input buffer to use to wire up the 3-bar to the Baro input. I'll wire that up tonight as well, so I'll hopefully have some data within the next few days.

 

[slowgsr]

I like it Paul.

Best thing for these cars is a proper catch can setup. I have something very similar, and it works extremely well.