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Crossflow Oil Breather Set-Up
TimC - 14/9/09 at 10:41 AM

Ok, bear with me folks... still finding my way around the Crossflow.

What is prompting the question is that my rocker cover doesn't appear to be very straight and hence I am losing some (not very much at all) oil underneath it at the gearbox end.

I have two spare rocker covers. However the existing one has been modified such that the crankcase breather is connected to an additonal inlet. The plastic filler/breather then feeds the catch tank.

Is this a sensible way of doing things? Is there another equally good way of doing it such that I can replace the rocker cober without having it modded? I have an unused inlet on the MOCAL catch tank too.

Car is 1300cc to 750MC regs if that makes a difference.

Ta

TC

Nash - 14/9/09 at 01:15 PM

Hi TC,
you can buy a rocker cover filler cap that vents so as to leave the cover intact. It is common to vent both the crank case breather and the rocker breather to the same place. Originally it went back to the inlet manifold but I vent mine to a bottle. If you look in my photo archive i have a photo of the set up.

HTH's ........ Neil

procomp - 14/9/09 at 06:40 PM

Hi Tim

The system you have should work fine. But if replacing that existing cover and looking to fit a replacement WHITHOUT modding another cover ( i think that's the gist of what your after ) then run the block breather pipe up high in the engine bay and then into the catch tank. The existing filler cap / breather will drop on to the new cover with no problems.

Cheers Matt

prawnabie - 14/9/09 at 07:00 PM

You'll be amazed at how much oil the cam flings up the breather - even with the pump or a deflector plate there. I would leave it to fall back into the rocker.

At high rpm's on the track that last thing you want is oil slowly leaving the engine via a breather!

02GF74 - 14/9/09 at 07:10 PM

quote:
Originally posted by prawnabie
You'll be amazed at how much oil the cam flings up the breather - even with the pump or a deflector plate there. I would leave it to fall back into the rocker.

At high rpm's on the track that last thing you want is oil slowly leaving the engine via a breather!


yep I have an allo rocker cover with maybne a 1 mm hole in the cap and the casing hollow next to the thermostat gets filled with oil.

my previous cover, steel, modified with filler placed at rear and the placcy cap never dropped oil.

so need to figure way of stopping this .

stevebubs - 14/9/09 at 07:19 PM

My rocker cover used to leak a little.

Trick I was told was "fit 2 of the cork gaskets"

Certainly solved the leaky cover for me...

prawnabie - 14/9/09 at 07:27 PM

Ive noticed that the "burton" style alloy covers are bigger than face on the head that the gasket sits on, not doing any favours for sealing at all.