Crankcase Evacuation with the LT1 smog pump. How To:

[Pronto]

Outside air for the pcv to work comes in though the air pump while it's off?

 

[CS99]

Outside air for the pcv to work comes in though the air pump while it's off?

I think so...I will see if I can blow air backwards through the vac pump when I get a chance.

 

[turbojoe1]

I run both Moroso breathers under the intake to a T then to the evac pump. I run no breathers on my valve covers. Can't stand the smell of oil vapors inside the car. I still run the factory PCV valve with the RJC check valve inline.

Very nice clean set up. I noted this in another post of yours about fitting a big turbo

 

[ttypewhite]

Outside air for the pcv to work comes in though the air pump while it's off?

Yes, You have to remove the internal check valve on the evac pump model I have.

 

[CS99]

Vac pump # 12568382 is what I put on mine. I just check and air can flow backwards through pump...so no check valve in this one.

Will 5/8 i.d. hose to each valve cover be enough...or do I need a large hose? The inlet to the pump is 1"

I am also getting some oil in the vac pump....Do I need to get baffled grommets for the valve covers breathers ?

 

[chriss4655]

I'am in the process of doing this mod, I run stock valve covers and my thought was to use the P/S valve cover to the pump and just leave the breather in the drivers side, this way I should not have to modify the air pump . stock pcv with check valve also. Will this work ?

 

[Pronto]

If you run a breather in the drivers side I think it would work fine. The stock filler is not a breather though. Probably makes sense to run some kind of oil separator there.

 

[chriss4655]

Thanks for the reply Pronto ! I have a breather on the drivers side . I forgot to mention that , I was reading a post on this and they were taking the pump apart a removing some foam and a check valve, not sure if I have to do this or not !!!

 

[Pronto]

The LT1 pump has the foam in it and that cuts the vacuum pulled. Other pumps don't have that restriction.

 

[chriss4655]

I was going to use the racetronix wiring harness and they have three delphi pump options that are plug and play. Are u familiar with them? if so which which has no foam ?

 

[Pronto]

The 2 wire ones. The 3 wire is the older design the so called LT1 pump. You can see the pumps and part numbers on the Racetronix webstore.

 

[chriss4655]

Right on thanks , going to get started !! The people that have done it say it works good !!!

 

[chriss4655]

The system is up and running and it works great !!!! I used the wiring harness from racetronix and the second pump pictured on their site !! I used the stock PS valve cover setup to the pump and then to a catch can hidden out of site !! I run a breather on the drivers side and a stock PCV and check valve, One word of advise I had to use a 25amp fuse instead of the 20 amper supplied with the kit . If you don't look really close you can't see it and you would think I'am still running the stock breather into the turbo inlet . The pump is hidden by the KN filter , the catch can is hidden DS front fender just up from the air dam, and as you can see I used the stock breather set and metal tube !!!

 

[Pronto]

Nice work!

 

[chriss4655]

THANKS !!

 

[forcefed86]

Anyone using this without the air/oil separator on it? My setup is pretty much "race only". I do not run a standard PCV setup and have the pass side VC vented and the driver side VC hooked up to my VAC pump. I have been just leaving the VC's vented but I'm tired of the mess and would like to get a decent amount of vacuum on the crank case while I'm making a pass. Had anyone actually measured the amount of vacuum one of these 2 wire pumps pull with no filter in between?

Here is my setup currently. I haven't even wired it and may change things around a bit. (sorry this ones not a buick!)

Turbo LS 5.3 in a 79 rx-7.

 

[Robert Wilson]

Anyone using this without the air/oil separator on it?

I run two moroso oil separator breathers, one in each valve cover, into a tee then straight to the pump without a catch can. No pcv valve. Used it like that for over 4 years without any issues.

Posted from the TurboBuick.Com mobile app

 

[forcefed86]

I run two moroso oil separator breathers, one in each valve cover, into a tee then straight to the pump without a catch can. No pcv valve. Used it like that for over 4 years without any issues.

Posted from the TurboBuick.Com mobile app

I believe thats what mine are. I'll give it a shot this way too.

thanks!

 

[forcefed86]

Anyone used a radar temp gun on their vac pumps? Tested mine this weekend and they get warm fast! I have mine set to come on at 1psi, but also have it on a switch. I like to run it on the initial startup as well. Seems to pull a lot of moisture/crap out at this time. Got up to 200* in about 4minutes. 220* in 5 minutes. Then I shut it off. Seemed like it was climbing pretty rapidly. Not sure what they are rated to temp wise. Anyone run theirs constantly with a temp reading? I’m sure 220* was fine, but I didn’t want to chance burning the pump up.

 

[chriss4655]

Mine stays cool, It never runs for more than 10 or so seconds at a time , I have it come on with boost only as I have no manual switch, I run the second pump in line on the racetronix sites pic's !!! System works great !!!