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Author Topic: brether hoses  (Read 876 times)

BUC957

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brether hoses
« on: September 28, 2011, 07:31:26 AM »
hey guys im over the way the rocker cover breather hoses are connected. to move the 90degree metal bends on the rocker covers so they face one way perfectly, can i just turn them? or do i need to remove rocker cover, turn them thn re-seal them etc? i want them so they both face the same direction going down the rocker covers so i can do a new pipe layout.

Stalk3r

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« Reply #1 on: September 28, 2011, 07:43:13 AM »
turn them then tap them back down to tighten

R33_400R

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« Reply #2 on: September 28, 2011, 08:07:51 AM »
Yep put the largest round item you can fit the the pipe, e.g another smaller pipe and gently twist then tap down as Stalk3r said.

using item as big as you can fit wont damage the fittings, if you used a small screw driver for say you will most likely end up deforming the roundness of the fitting.
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Stalk3r

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« Reply #3 on: September 28, 2011, 08:18:24 AM »
i found a crescent works quite well surprisingly, it supports both sides so when using rotational force doesnt deform

then again, im odd so i could have just been lucky

BUC957

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« Reply #4 on: September 28, 2011, 10:49:22 AM »
so thats as is with rocker covers still on? i wouldve thought you would pull the hose fitting up rather than push down

D1LEMA

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« Reply #5 on: September 28, 2011, 11:00:54 AM »
yeah with rocker cover still on ... as you twist them they will come up. once in position you want. tap them down and they will stay in place.
« Last Edit: September 28, 2011, 11:39:55 AM by D1LEMA »

Stalk3r

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« Reply #6 on: September 28, 2011, 11:19:50 AM »
yea as you turn them they tend to worm out a bit, so tapping them back down just locks them back in, theyre a taper press fit so no thread or anythng

rrcredline

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brether hoses
« Reply #7 on: September 28, 2011, 01:08:54 PM »
I fitted internal breather pipes to run from under the old outlets and feed them out the back of the camshaft covers (what are "rocker covers" on a RB twin cam, they don't have rockers) and then off to the catch can from there.
I turnd up blankers to block the original outlets.
http://homepages.vodafone.co.nz/~lakewood/Skyline/Crank%20Case%20Breather-1.jpg
http://homepages.vodafone.co.nz/~lakewood/Skyline/Crank%20Case%20Breather-4.jpg

Neat and tidy and works a treat.
I have done this to both the RB30DE in the R32 and the RB25DE in the track car.

Nigel

BUC957

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« Reply #8 on: September 29, 2011, 06:52:08 AM »
that does actually look pretty awesome. maybe on a skyline worth doing that on lol but thanks guys will be ghanging that very soon

D1LEMA

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« Reply #9 on: September 29, 2011, 08:24:53 AM »
Quote from: rrcredline;574094
I fitted internal breather pipes to run from under the old outlets and feed them out the back of the camshaft covers (what are "rocker covers" on a RB twin cam, they don't have rockers) and then off to the catch can from there.
I turnd up blankers to block the original outlets.
http://homepages.vodafone.co.nz/~lakewood/Skyline/Crank%20Case%20Breather-1.jpg
http://homepages.vodafone.co.nz/~lakewood/Skyline/Crank%20Case%20Breather-4.jpg

Neat and tidy and works a treat.
I have done this to both the RB30DE in the R32 and the RB25DE in the track car.

Nigel


Damn thats quiet well done !  Very tidy :)

RENEN

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« Reply #10 on: September 29, 2011, 10:39:21 AM »
I pulled the standard 90 deg fittings out and used speedflow fittings


hacksaw

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« Reply #11 on: October 12, 2011, 11:47:23 PM »
what does the hose from the breather to the intake manifold do? and where does the other breather hose go to?
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b00stinz

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« Reply #12 on: October 12, 2011, 11:53:46 PM »
Its so the crankcase is constantly evacuating itself.
When you're on throttle the hose going into plenum is blocked by the PCV valve (that bolt you see that the hose goes on). It has a little ball bearing thing inside that shuts the hole due to vaccum pressure from intake side. The vapour and oil from engine is sucked in the other way which is that other breather pipe going to the turbo intake.

When you're off throtte, the system evacuates via the hose going into the plenum due to the negative pressure inside there.

live4liners

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« Reply #13 on: October 12, 2011, 11:54:21 PM »
they just breathe oil vapour into the manifold for emissions standards or something. they need to breathe because there is pressure from the crank case.
and cresent worked very well for me too. 10" or so.

AGRORB

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« Reply #14 on: October 13, 2011, 12:02:23 AM »
Also so you don't over-pressurise your crank case and end up with leaks, I blanked the PCV valve on the plenum off on my old car and just ran a vented 1 litre catch can. They can get quite smelly though.
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