Crankcase ventilation routing - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 20th, 08, 08:00 AM Thread Starter
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Crankcase ventilation routing

I'am working on getting the crankcase ventilation hoses for PCV and stuff hooked up to look stock on 1969 396 375HP. Stock the hose from driver side is PCV than hose to carb base. The part that I do not like is the hose from pass side is goes into bottom of cowl induction air cleaner. Is a small filter supposed to go in pass side hose? The hose is hooked to the bottom of air cleaner inside the area of air draw. To me that seems to be a bad spot because it would have a pull on it. The way my car is now is driver side has vented cap and pass side is PCV to base of carb. What I'am thinking of on pass side is to hide small K&N under air cleaner to look stock and would not have air cleaner draw on it. What do you think?
(My little girl likes this one )
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post #2 of 5 (permalink) Old Dec 20th, 08, 02:35 PM
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Re: Crankcase ventilation routing

Stock is from the base of the air cleaner to the valve cover. The valve cover fitting is a 90° steel elbow. See it? (yep, it's original)
Edit; More thoughts. When there is 'pull' on the air in the hose, that's good. It would happen at full throttle only. The PCV valve can't do anything at that time.

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post #3 of 5 (permalink) Old Dec 20th, 08, 06:25 PM Thread Starter
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Re: Crankcase ventilation routing

I'am going to use these valve covers the engine is using Crane 1.7 roller rockers. I do not have a set of valve covers to compare to. http://www.ss396.com/mm5/merchant.mv...ERSACCESSORIES Anyone try these? Do they look original but taller to you?

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post #4 of 5 (permalink) Old Dec 21st, 08, 06:26 AM Thread Starter
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Re: Crankcase ventilation routing

I think with this set of valve covers, stickers, wire retainers, cover gaskets, grommets, bolt , bolt reinforments and oil cap I can make it look stock for about $200. A couple of wire retainers, new style LSX PCV, clamps and hose I already have. Anything else you think I need.


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post #5 of 5 (permalink) Old Dec 21st, 08, 10:31 PM
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Wes
 
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Re: Crankcase ventilation routing

Because the crank act as a fan in the crankcase, the blowby gases (nasty stuff) exits though the PCV valve on the driver's side valve cover. The other valve cover is from where clean air is pulled into the crankcase under normal driving condtions.

I'm sure during higher blowby conditions (higher RPM or older engine, etc.) blowby gases can exit back into the air cleaner base from the pass. side valve cover where it's sucked back into the engine through the carb.

For street driven cars, I've always thought that having flow through the engine as Chevy designed, is better than breathers, because flow will remove the hydrocarbons, acids, and vapors, that will cause sludge, wear, and corrosion.

Also, keep in mind, not all PCV valves are equal. Engines with different vacuum levels need a valve to match. CV746C from AC-Delco is what I use for engines with limited vaccum.

FWIW
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