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Old 05-03-2005, 17:28   #1 (permalink)
XFFAIRMONT
 
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Crankcase Breathers

What do people recommend for crankcase ventilation. At the moment i have two shitty breathers which leak oil. I took the pcv valve out to try and get more vacuum for the brake booster. I'm currently putting new rocker covers on it and the breather will not fit on the left rear as it is too close the the clutch master cylinder. It will fit the pcv valve but it will worsen the brakes. Does anybody run two breathers on the front of each cover. Is it not recommended if i will be driving the car a lot. I read in the manuals that you are to have one to the back of the carby and one to the base of the aircleaner.
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Old 05-03-2005, 18:03   #2 (permalink)
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Re: Crankcase Breathers

In non-pollution cars they never ran to the base of the aircleaner. It was just a breather on the passenger side head. From XC onward the breather went to the aircleaner.
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Old 05-03-2005, 18:49   #3 (permalink)
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Re: Crankcase Breathers

You shouldn't be spitting out oil if all is ok and the covers are baffled. If you are spitting out excess oil, it is blowby.

You must use a PCV valve if you are connecting the covers to the engine inlet (vacuum source). The PCV valve has no effect on the brakes.
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Old 05-03-2005, 20:02   #4 (permalink)
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Re: Crankcase Breathers

Quote:
Originally Posted by Racer
You must use a PCV valve if you are connecting the covers to the engine inlet (vacuum source). The PCV valve has no effect on the brakes.

I'll second that. If the PCV valve is removed, you will have a massive vacuum loss. If it makes your brakes worse (?????) then maybe the whole lot is plumbed up wrong....?

Brake booster should go to a manifold fitting, PCV from the rear of the RH cover to the lower carb fitting, and form XC on, hose from cap on front of LH cover to SIDE of aircleaner housing. Pre XC just had a breather cap, or, is that pre-'75...?
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Old 05-03-2005, 20:13   #5 (permalink)
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Re: Crankcase Breathers

does anyone PCV vales make a noise here? Mine makes a constant rattle of the bearing as i dont thave the vacume to hold it closed, any fixes?
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Old 05-03-2005, 20:40   #6 (permalink)
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Re: Crankcase Breathers

Sorry i worded it all wrong i suppose. The Funnelweb intake doesn't have a outlet for the brake booster, so there was a hose running from carby base then a tee piece and one hose going to booster and one going to pcv valve. so some of the vacuum was taken by the pcv which when i plugged the tee piece off for this the brakes had more vacuum. I needed to do this due to lack of vacuum already for the booster cause of cam and intake combo ect. I can't fit a breather at the back left because it is way to close to the clucth cylinder. Just want to make shure its safe to run two breathers all the time if so i will put them both up the front of the rocker covers. Just if i do this and evr put the pcv valve on i've got to run the hose all the way from the front of the rocker cover which will look stupid. So is it fine to run two breathers all the time?
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Old 05-03-2005, 21:36   #7 (permalink)
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Re: Crankcase Breathers

I wouldnt get pinged by the epa if your not running a pcv! was a story in a recent SM mag of cops AND epa busting people going to wisd I think it was and one bloke copped an $800 odd fine from memory.

Im hopefilly going to fit the 4Vs and funnelwebb this weekend and im going to drill and tap a fitting into the manifold.
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Old 05-03-2005, 21:43   #8 (permalink)
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Re: Crankcase Breathers

Just drill and tap the manifold for the fitting. I had to do that on my CHI manifold.

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Old 05-04-2005, 02:21   #9 (permalink)
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Re: Crankcase Breathers

I can understand your problem.... Loss of vaccum. I have run a vaccum tank. What you need to do is run a hose line to the vaccum tank and a second outlet that runs to the engine with a one way valve so it stores the vaccum in the tank with this method you should eliminate your problem. The price of a vaccum tank if you can find someone to knock it up for you would probably set you back $120 polished.Then the fittings on top : low pressure check valve - $31, and the other bits and pieces you are looking around $28 this is how much it set me back. This is what you need to run when you run large lift and duration cams.
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Old 05-04-2005, 03:59   #10 (permalink)
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Re: Crankcase Breathers

XFFairmont i intend to run 2 breathers at the front of my covers. I haven't seen any reason not to. I was using a vacuum tank & pcv on my old engine., with my current engine no pcv & 2 breathers.

Brenx where did u tap into for your vacuum line?
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