Now I'm confused
I need to fit a breather system to a 2wd sapphire cosworth, I was looking at the Bailey system and then phoned GGR to see how much there 2 port breather was.

they told me that there system breathes from the crankcase, and you should not breath from the cam cover because if it's ventid from the top, the pressure will stop the oil feed to the head from draining back to the sump.
If this is true can the Bailey system be adapted to vent this way, as it is a lot cheeeeeper, and you dont have to remove the cam cover.

Any info or diagrams for the technicaly challenged ( ME ) will be appreciated

 

Anybody ???

 

Breathing from crankcase is best.

At it's most basic (or complex if you see) all a breather system is;

>A pipe from one side of the crankcase (or a pipe from either side of the block) to -
>A separator - this attempts to separate the oil vapour from the combustion gases, the oil vapour condenses in the unit and is directed back to the sump (below oil level)
>Then another pipe out of this to -
>A catch tank - this collects the remaining vapours in the gases that condense for draining off periodically
>Then another pipe out of this to -
>Either atmosphere or back into the inlet manifold. The first being for those who don't want to risk detonation from contaminates in the air charge, the second for those who are environmentally conscious.


A 2 port system only takes a single pipe from one side of the block, a 3 port system takes two pipes (one from each side of the block).

Most OE systems vent the crankcase from the rocker cover for cheapness.

 

"Quote" Most OE systems vent the crankcase from the rocker cover for cheapness.

So Graham Goode Racing are right in saying there system is a better way of doing it then.

Even though the 2 port (without the catch tank) is about Ł400

 

the vapour pressure originates in the crankcase, making this the best place to vent it from, rather than waiting for it to find it's way up to the camcover first...

 

Yeah, GGR are right, bear in mind you are paying top dollar for their kit (and I will say it is very well made) but there are alternatives out there that are just as good function wise. Any competant aluminium welder can make up a separator and you can do the whole lot quite a bit cheaper if you are prepared to do a bit of work yourself rather than get an off the shelf solution.

 

Please explain what the benefits are of breathing from the camcover INSTEAD of from a second opposite side crankcase port??
Whilst there may be some benefit in taking pressure from the camcover as well as 2 crankcase ports, if the crankcase breathing is adequate there should be no appreciable camcover pressure anyway..

 

Tosh, any two port separator can be used i'd imagine (that's two breather inlets FROM the engine at the top of the separator, then at the bottom there'll be an oil return to sump, and a breather gas outlet to either catch tank or easier still to atmosphere) - just have the pipe coming from the other side of the engine block to the separator instead of from the cam cover.

 

I don't think there is any benefit from breathing from the cam cover, all you are trying to do is deal with the combustion gases that have got past the piston rings. If you can extract them from the block (ie at source) then as GGR said the oil can drain from the head without being restricted by the flow of gases upwards. That said, a lot of heads have a dedicated passage through the head for the gases that the oil cannot drain down. I also recall that classic formula ford pinto engines were fitted with an external drain for the oil and the air passage was blocked off in the head. Many ways to skin a cat.......

 

So I'm just thinking why do Bailey say vent from the cam cover insted of plumbing down to the turbo side of the block, surely that's a easy and cheaper way to do it , you would just need to remove the existing hex plug and fit a threaded adapter, insted of removing the cam cover, drilling it and tapping a thread, new gasket etc.

Thanks everybody for youre views & comments so far, some picks would be handy if you could, or even better Baileys fitting instructions.
Also do you need to tap a boss into the sump for the oil return, and what happens to the port on the air filter box where the old breather goes in.

THANKS