Crankcase Pressure. FREE HP!

[Dex]

I free'd up about 80tq and some HP from taking my damn oil cap off. Whos selling the catch can stuff? I forgotted. I need that Saleen breather cap too

 

[jsawyer]

I free'd up about 80tq and some HP from taking my damn oil cap off. Whos selling the catch can stuff? I forgotted. I need that Saleen breather cap too

Does this alieviate the need for an oil seperator? Did you dyno it w/o the oil cap?

 

[lostsoul]

wtf??? someone speak dumb english tell me this is possible?

 

[don_w]

wtf??? someone speak dumb english tell me this is possible?

For you, absolutely!

 

[Dex]

took the oil cap off and held a paper sheet thing over it. First pull on TQ was 579 with the oil cap on. Leaned the fuel up a bit then it went to 654tq with that sheet type thing. Then we got a real rag and did a pull and it went to 687TQ without touching the tune. HP went from 601 to 633 from first to last pull. Took the air filter off and did a pull, free'd 7HP (640) but lost a few TQ.

Crankcase pressure is a biatch. Make sure you are letting it out! It was insane how much air came out of the oil cap!!!

A/F was around 10.5 with 100% Methanol. 15lbs of boost

 

[Ricky Bobby]

I would have to say that is interesting info there....maybe why so many boosted 3Vs are breaking. Wonder if it helps a N/A car any?

 

[Dex]

Think how much pressure is being put on the internals.

 

[SoundGuyDave]

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.

 

[scramblr]

So what do breathers do in this instance? Wouldn't they relieve pressure as well?

 

[Dex]

I was thinking about doing a pump but if I route to the catch can then into the intake the turbo would be sucking that air in anyways giving me more air and possibly a little faster spool.

I'll put a breather on the oil cap

Yes, breathers would relieve pressure. Taking that oil cap off was insane. So much air was flying out of that sum bitch

 

[ChevyKiller]

Was any oil flying out? My concern is the mess with a breather for the oil cap.

 

[scramblr]

I think JimIII or their blue car is running a breather in-place of the oil cap.

 

[ChevyKiller]

I am interested to hear from anyone who is using a breather on the oil cap and did you see any gains and is there any mess?

 

[Dex]

I'll test it out. I already know I picked up gains from having the oil cap off.

 

[scramblr]

Not to stray too far off subject, but immediately after putting on my breathers, the passenger side was a bit of a mess within a week. Dealt with that for about a month until I pulled both breathers, cleaned and re-oiled. I think originally I oiled the passenger side too much, because now after a month, not one drop of oil has come out.

Just guessing it may be the same thing for the oil cap breather.

 

[A John In NJ]

Pictures pictures!!!!

 

[Dex]

pictures of what?

I have the final chart and I think I have the previous runs. I will check to see if the shop has all of them and I can show you guys. Once I get the breather for the oil cap I'll do a test with the cap on and with the breather on. You'll be amazed!

 

[lambo killer]

So take the oil cap off when you are racing lol Does anyone have a link to that breather cap thingy? I am going outside to relieve some pressure.

 

[Dex]

Oil will spray everywhere without a cap or breather

 

[don_w]

Oil will spray everywhere without a cap or breather

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