Having sprayed Simons dyno bay a couple of times because oil was being forced up from the sump (chuckling at the person who says this cant happen) stuff 800bhp up it & lots happen .
Mark decided to develop the system below it includes a one-way valve to stop the blow back problem. It works & completely solved the problems. Mark later said it was one of his best developments & we heard about it for weeks . A similar system can now be purchased from Spec-r for power over 700bhp.

 

brammer is'nt running 800bhp and stupid amount of boost to get it though is he?

what i'm saying is he needs to return to below oil level and not to the block, if a one way valve needs fitting to stop blow back on bigger bhp engines then i've learn'nt something new but you would'nt return to the block and fit a one way valve, would you??? you still need to return below oil level.
are you saying i'm wrong??

 

Correct justin bought that engine i took it out my 3 door above & fitted a scs engine ! i didnt know at the time how the car was smoking so i changed the full engine & breather system ! i wasnt happy with the breather system if i remember right one return went really thin so i got my sump modified fitted a bailey one breathing from both sides of the block & drain into the sump was perfect , didnt know it was that long ago i had that 3 door seeing the date on the post

 

correct i got andrew to weld a return pipe on my sump was perfect afterwords

 

yeah i remember that fitting, that would be perfect because it had a pipe fitted so it would go below oil level

 

i see what rods saying thats another level of breather system at the same time a bit extreme for brammer

 

I like that setup Rod, maybe a little overkill for mine but deffo a decent bit of kit, Dave mentioned the one way valve.

Justin i can't understand what you are saying regarding this system, did you ever fit this to your cossie mate the way you are stating going to the sump????

 

yes mate when i had it the oil return was to the sump.
which bit do you not understand?
what i'm saying is you need to return the oil below oil level and not to the block where there is pressure.

 

The bit i don't understand is 2 people both used the same system and one says sump and the other says block after the tank pumping the complete sump content out.

 

Spec-R have used 3" diameter seperators now for nearly 10 years for their fast road and Group A breather systems.

And as Rod has shown/said, have developed this new system.(with input from Mark)

 

your seperator design is the same as a ggr type with a plate inside to devide the seperator into 2 which makes the oil drain into the bottom fitting and the air out of the top two fittings opposite to the infeed fittings.

how can you drain oil into something that is blowing the oppisite way?
ask a couple of tuners where to drain the oil to

 

the crankcase pressure you refer to is equal no matter where you stick your fittings
The engine is merely an odd complex shaped container. Try to picture your engine as a simple container.
If you have pressure in your crankcase your engine is either fooked or your breather is crap and cannot flow sufficient gases.
your crankcase pressure should be no more than 1 atmosphere or to the layman 0
ideally some negative pressure is preferable which is what a new standard cosworth had with it's breather design on engine decel

 

a simple fix to the ggr and spec r systems is to convert your catch tank into a separator. This is quite simple you need to modify the catch tank by fitting a -10 fitting and pipe to the lower most point of the tank ie convert the drain tap /drain blank.throw the tap /blank in the bin.

Pipe this new -10 fitting back to the convenient crankcase fitting on the block by the block coolant drain plug. you will need to heat wrap the pipe and also make sure it has constant fall and is routed clear of the exhaust and manifold
If you are already using this point on the block you will need to T into it making sure the priority flow is from the catch tank.
IF using a ggr catch tank you will need to add a second -10 min fitting on the upper most corner of the tank to atmosphere.
The spec r catch tank does not require this as it has huge atmospheric flow just pore crankcase flow.
By carrying out the above modification you have also increased the crankcase flow.
I hope the above is easy to understand
you have now converted your breather system to the Turbo systems design of the 80's era

 

UP!

Where can i find a 3-way oil breather systems with alla braided lines and Aeroquip -10AN fittings please?!

 

I love the ones we get in with 2, 3 or 4x 17mm pipes going to a seperator... and ONE 15mm pipe coming out to atmosphere.

Customers are real pleased when I tell them that they have downgraded their breather to worse than standard at huge cost. LOL

 

Do I just pipe the rest up as normal including the separator being plumbed into the cam cover?

 

is it best to have a separator and catch can????
I have the auto specialist ones like the old bailey type and I am getting a oil spray out of the bottom under the car , I am breathing from the cam cover , block from where the kidney box was fitted and have it returning to the block under the turbo and a vet to atmosphere from the tank
cheers

 

Hello all

On the subject of breather systems I think I've got an issue with the std setup.
Fully rebuilt the engine last year to standard spec using mahle .5 over sized pistons , new oil & water pump , head rebuild , valve guides , stem seals etc. All new gaskets & oil seals.

T3 has been replaced with a t34 - still running standard power.

After the running in period was complete I noticed oil leaks from both crank seals , and I also get a lot of oil smell through the cars air vents when changing down on overrun.

Had the rear main replaced with a victor reinz oil seal - not even 100 miles later leaking again. i got underneath wiped down the sump & gearbox and ran it on idle and no leak. So can only assume its oil crank case pressure forcing it out.

Removed all breather pipes inc kidney box all clear no blockages , air filter is a k&n panel filter - also clean and clear.

Any ideas ?
Cheers
Clark