PCV valve question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

n737nc · 06-30-2004, 03:29 PM

Is it wrong to not have the PCV valve routed to the carb? I just have both valve covers vented with the filter type caps.

I asked this question in the engine forum, in a reply to someone elses question, but it never got answered.

Sweet72 · 06-30-2004, 03:58 PM

It's perfectly fine to just vent the crankcase to the atmosphere, that's how it was done before the advent of emission controls. However, you may have to adhere to state and local emissions laws. Depending on what year your vehicle is, it may not have been originally equipped with PCV. As far as engine performance and mileage are concerned, the PCV offers no advantages. JMO

n737nc · 06-30-2004, 04:00 PM

Thats what I needed. Thanks!

Nick

LONGHAIR · 06-30-2004, 04:05 PM

You will eventually get an oil film on everything behind it, in the path of the airflow. The PCV valve will allow this vapor to be burned and therefore not run/drip on your engine. There is no performance advantage nor disadvantage and using one will keep you engine bay cleaner.
Not all progress is bad......

n737nc · 06-30-2004, 04:28 PM

Thanks Longhair.

I spend more time wiping everything down on this truck than I do acually driving it. So, I don't think that will be an issue

06-30-2004, 03:29 PM	#1
n737nc Registered User Join Date: Jun 2004 Location: Dallas, Tx Posts: 207	PCV valve question... Is it wrong to not have the PCV valve routed to the carb? I just have both valve covers vented with the filter type caps. I asked this question in the engine forum, in a reply to someone elses question, but it never got answered.

06-30-2004, 03:58 PM	#2
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	It's perfectly fine to just vent the crankcase to the atmosphere, that's how it was done before the advent of emission controls. However, you may have to adhere to state and local emissions laws. Depending on what year your vehicle is, it may not have been originally equipped with PCV. As far as engine performance and mileage are concerned, the PCV offers no advantages. JMO __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.

06-30-2004, 04:00 PM	#3
n737nc Registered User Join Date: Jun 2004 Location: Dallas, Tx Posts: 207	Thats what I needed. Thanks! Nick

06-30-2004, 04:05 PM	#4
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	You will eventually get an oil film on everything behind it, in the path of the airflow. The PCV valve will allow this vapor to be burned and therefore not run/drip on your engine. There is no performance advantage nor disadvantage and using one will keep you engine bay cleaner. Not all progress is bad......

06-30-2004, 04:28 PM	#5
n737nc Registered User Join Date: Jun 2004 Location: Dallas, Tx Posts: 207	Thanks Longhair. I spend more time wiping everything down on this truck than I do acually driving it. So, I don't think that will be an issue



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