Crankcase Pressure. FREE HP!

[lambo killer]

Dex keep us updated on the breather. I am definetly interested in it.

 

[Dex]

I wrote in the JDM forum but I think I'll just give them a call right now.

 

[marcspaz]

...Wonder if it helps a N/A car any?

I have an NA car. After reading this I tried venting the crank case and the heads, both together and seperatly. All opening were covered with filters. I made 8 pulls with no changes to tuning. There was no changes to my peak HP or TQ. Doug was the last person to tune my car, so I didn't want to mess with it.

I did notice that on a street test, the motor sounds to have recovered faster from bouncing off the rev limiter during 1-2 and 2-3 power shifting. I am going to take it to the track to test that idea next Wednesday. Should be interesting if I can see an improvement at the track.

I noticed the engined had a slight sound change too. The change was very small, but I sounded like it was not working as hard to make the same power...if that makes sence.

 

[Dex]

Put a call into JDM and they discouraged it until I told them how much more tq and hp I got out of doing that. I guess it can lean the fuel out a bit because it would be like having a vaccuum leak. I didnt notice a big change in my A/F doing this. If it causes fuel mixture problems then I would assume its just in drivability. Boosting the motor only pushes the pressure out the hole. JDM pointed me to Metco

http://www.metcomotorsports.com/proddetail.asp?prod=MBR0005

and there it is

 

[Dex]

I have an NA car. After reading this I tried venting the crank case and the heads, both together and seperatly. All opening were covered with filters. I made 8 pulls with no changes to tuning. There was no changes to my peak HP or TQ. Doug was the last person to tune my car, so I didn't want to mess with it.

I did notice that on a street test, the motor sounds to have recovered faster from bouncing off the rev limiter during 1-2 and 2-3 power shifting. I am going to take it to the track to test that idea next Wednesday. Should be interesting if I can see an improvement at the track.

I dont see it benefiting an N/A car because you arent putting a ton more air into the engine.

 

[marcspaz]

I dont see it benefiting an N/A car because you arent putting a ton more air into the engine.

Same here. It was more for the sake of "what if" kinda testing. I have the ability to dyno my own car and I'm not working today. It was fun to try it out to see what happens anyway...

 

[Dex]

Gotcha.

Ordered. I already know for a fact this will help but I will overlay some dynocharts with the cap on and the breather on when it gets here.

 

[marcspaz]

Cool, Thanks fo getting this out. Once I get the Saleen installed, I will want to do some mods like this to help the car make better power.

 

[Forge]

aswome info Dex, please keeep us up to date. My dyno time isnt for another 15 days, i may get a breather as well just to make comparisons on the dyno.

Was the dyno you were using load based? (ie. mustang dyno)

 

[Dex]

dynojet

 

[MLC40]

Did you do a PCV delete? If so, you may want to think about a crankcase evac pump, like the LT1 boys run. I could see how you would generate a BUNCH of pressure with a boosted motor and the stock "PCV" setup. If I were doing that sort of motor, I would run scavenger lines from the driver's valve cover over to a catch can, then plumb the output of the can through a vacuum pump, and hang a filtered breather on the passenger side valve cover. Plug the inlet air tube nipple and the intake manifold nipple as well, obviously.

If I remember correctly someone on this site installed a GM vacuum pump and did the before and after dyno pulls, no change. I agree breathers are the way to go, as I had trouble with my oil separator earlier this year and eliminated the setup.

 

[05stroker]

Did you do a PCV delete? If so, you may want to think about a crankcase evac pump, like the LT1 boys run. I could see how you would generate a BUNCH of pressure with a boosted motor and the stock "PCV" setup. If I were doing that sort of motor, I would run scavenger lines from the driver's valve cover over to a catch can, then plumb the output of the can through a vacuum pump, and hang a filtered breather on the passenger side valve cover. Plug the inlet air tube nipple and the intake manifold nipple as well, obviously.

I did the catch can on the drivers side and the breather on the pass side and the breather was soaked in oil in 300 mi . This was with out the vac. pump though.

 

[flounderlipps]

And getting that under the rear tires could leave a mark...

On your fender and in your shorts.

 

[GI Joe]

my car has breathers...well remote breathers..same concept...both side plumbed to a catch can with a breather. If you do both sides you will be fine.
Mine is remotely located to prevent oil mist on the motor...you can get a look at it here

 

[94tbird]

my car has breathers...well remote breathers..same concept...both side plumbed to a catch can with a breather. If you do both sides you will be fine.
Mine is remotely located to prevent oil mist on the motor...you can get a look at it here

Dave

I relocated my power steering over there too. what did you mount the tank to? Got better pics?

 

[Dex]

Yea my PS is there too. Where did you pick this kit up? I need it

 

[SteveP]

I know Moroso makes a breather katcher tube thing that alot of high hp 5.0's run and its crazy seeing the pressure come out of the breather. I asked if they make it for our years and they do. I am going to look into it when i have some extra money after spending some on my Canton overflow tank and battery relocation stuff.

But if a breather will free up power. I want to prove this., I will go to my buddies dyno next week, Keep ya posted

 

[Dex]

Already proved! But would still love to see a few different dyno runs with overlays.


Metco shipped it today

 

[94tbird]

1 car isnt proof. proof is repeated results over many different cars and setups. I hope it works though

 

[Dex]

Proved with my car then