18 replies to this topic

[orangeLJ]

Well I whacked my new sheet metal rocker cover on a week or so ago and ran into a small dilema.

This is the rocker cover-


I used to run a push in breather cap on the front grommet from day dot with my old tappet cover, and a hollowed out PCV valve and tube that just sat behind the rear air cleaner

With this one, I was running a screw on o-ringed cap on the front and the same PCV valve setup.

BUT! It was pressurising the sump, blew oil past the fuel pump gasket (drip drip drip of oil from there) and was shooting oil out the dipstick hole (old gasket on there but a tight fitting dipstick)

So I cut down the grommet on the rear hole as it was quite close to the baffle on the underside

you can see the baffle here-



So that seemed ok, but It wasnt, while giving it stick, the sump was still pressurising and blowing gaskets out (not to mention when removing the carbies I found a fair whack of oil that had found its way into the inlets.....)

So my ideas are roughly this-
Drill and tap a braided fitting into the side at the rear top of the cover and run a braided fitting to a catch can aswell as diverting the PCV hole into the catchcan

Drill some holes in the baffle to increase air flow around it

or, remove the really nice looking screw on cap from the front (I dont really want to) and fit a bodgy looking breather....

Ideas?

[76lxhatch]

You definitely need a breather, maybe you can find space to fit it as well as the oil cap?

[greens nice]

hey, sexy rocker cover, whered ya get it from?
cbf making up a baffle on the old rusty chrome one i got.
sorry for bein off topic

[orangeLJ]

I'll have to dig out the address, but a joint in melbourne.

Wasnt cheap.

Its definitely pressurised, as when you unscrew the cap if "popped" up after the last thread.

and if it was under vacumm the oil wouldnt be blowing out the dipstick hole.

Engine is under 2000kms old. Only finished putting it back together in january this year.

Im not worried about legallity here. To be honest, I never have been (in regards to the pollution gear etc)

My pcv valve originally ran to a T piece between my 3 piece manifolds.

When I swapped to braided line in those gaps (instead of the old rubber ones) I couldnt get the T piece I needed, so it remained disconnected from the manifold and was simply tucked back behind the rear carby to give the impression that it was "plumbed" somewhere.

This is how it was setup before


And I never had a problem. (hence why im pointing the finger at the rocker cover for causing my dramas)

Removing the bottom of the grommet in the rear helped my problem somewhat (wasnt as bad) but there were still signs of a problem after giving it a bit of stick and then pulling up for a look.

[makka]

you need a pcv and a vent, not just 1

[orangeLJ]

pcv is hollow though so should be sucking enough.

I may just get rid of the pcv and pipe and run a K&N breather on the rear grommet, it should (in theory) flow more air then the restrictive air line?

[76lxhatch]

Yes the rocker cover is partly the problem because you removed the breather. Running a full-sized breather instead of the PCV will probably stop it pressurising (or at least reduce it), but the ideal setup is to have positive (the P in PCV) ventilation. Try each method for a few months and do an oil change, you'll see the difference

[orangeLJ]

I change my oil on a monthly basis usually anyway (car does maybe 100kays a month, if that)

[orangeLJ]

well with getting the torana on the road again, I really need to sort out my breathing problem.



My current idea is to TIG a fitting (-8) to the rear grommet hole, and tig another -8 fitting to the top of the oil cap.

What fittings would work best?

I was thinking that something I could just "clip" on and off (like a air line fitting) would be the best option and would be easy to put on and off.

Id like to run braided line eventually, but for now It will just be ordinary tube of somesort.

Im then just going to run both lines to a catch can bolted to the inside of the chassis rail on the drivers side (near the original horn)

for the wedding, Im just going to dodgy up a breather to fit over the front hole (rather then the cap) and see if that makes a difference. That should tell me if two beathers will be enough.

[orangeLJ]

Digging up another old post,

Im back onto wanting to fit this up before toranafest.

Ive decided to keep the front cap and instead fit another fitting to run twin lines to a catch can on the inner gaurd.

So, question, what size lines should I be running and do earls/speedflow do a one ended fitting that I can tig to the rocker cover

I also want to tig a fitting into the rear hole to do away with the "push in" style fitting that it uses atm

Im assuming that it should then breathe enough to prevent the problem. Ive been running another rocker cover with no issues, so it HAS to be the lack of ventilation causing dramas with this one.

[orangeLJ]

Thanks Craig!

Thats EXACTLY what I needed to know!

Any reason you went for PFE fittings instead of speedflow or earls?

Im planning to run braided lines to the catchcan (If I can afford it when I get to that bit)

I can Tig (just not too great) so I think I may just pay a "professional" to weld the bungs in to make it nice and presentable!

[orangeLJ]

Just another quick Question for you craig, whats the internal structure of your catch can like?

I was trying to work out whether it needs baffles or anything to design one to fit where I want.

Im going to run it as a radiator overflow aswell, but im not sure whether to seperate the fluids or not to worry.

this is all just planning at the moment, Ive got a serious lack of money to actually do anythign.

Rego is due in august, and it will be another year where I have driven a total of about 500kays in the thing.....