I have a Ford 302 crate motor and I do understand I need to ventilate the crankcase.
The question is it better to use a PCV valve or not? I read that providing a PCV valve promotes better crankcase ventilation from the neg pressure created in the manifold. On the down side it is not as attractive as just putting a ordinary valve cover vent in.
We do not need it for emission control where I live.
I gave up on PCV cause I autocross and couldn't keep it from sucking in oil mist during longer duration turns and fogging behind me. But, in general it's a good idea that doesn't really have any downsides performancewise. If you want to be semi emissions concious you could run a vent hose from the VC into the underside of the air cleaner.
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FFR 5353K,351/400hp,TKO 500, 3-link w/3.08 and Truetrac, Koni DA coilovers front and rear,APE hardtop,Forte front and VPM rear swaybars
I would highly recommend keeping the pcv valve... it's not an emissions device, it's for removing unwanted combustion vapors and moisture from the oil.
A PCV really isn't an issue on a street car. It does help with crankcase pressure, and venting the opposite side to the air cleaner limits where the oil vapors go.
Blowby and oil vapor still have to be addressed, having a breather dump oil all over the valve covers won't be any better looking than a PCV installation. Nobody builds a zero percent blowby motor.
Location: Blackberry Township, IL (west of Geneva)
Posts: 1,573
I used filtered breathers to a central canister (repro of the catch can from the 427 comp cars) mounted on the firewall. From there, there is an additional drain line that goes to a separate catch can. This way, the breathers are vented to the atmosphere, but I'm also ensuring that I don't dump condensation or oil on the tires (or the road).
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Later,
Chris
Mk3.1 #7074
Picked-up at FFR - 10/10/09
First start and go-kart - 9/19/12
"As smoke is blown away; so blow them away." Psalm 68:2
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