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Are there different flow rate PCV valves? #595145 01/26/10 11:07 PM 01/26/10 11:07 PM
Joined: Jan 2003 Posts: 1,017 Ridley Park, Pa. 69MOPE OP super gas
69MOPE OP super gas Joined: Jan 2003 Posts: 1,017 Ridley Park, Pa.	I have been instructed to drill my throttle blades to achive the correct idle charactistics with my high lift cam and was wondering if changing to a higher flowing PCV valve you could achive the same thing by allowing more air into the engine to get the T-blades where they belong?

Re: Are there different flow rate PCV valves? [Re: 69MOPE] #595146 01/26/10 11:18 PM 01/26/10 11:18 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	Quote: I have been instructed to drill my throttle blades to achive the correct idle charactistics with my high lift cam and was wondering if changing to a higher flowing PCV valve you could achive the same thing by allowing more air into the engine to get the T-blades where they belong? Im not following your question very well...Im not even sure what PCV valves would have any affect on idle quality...Most dont bother to run PCV on race orientated cars cause they have zero effect at WOT when you need it the most. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: Are there different flow rate PCV valves? [Re: 69MOPE] #595147 01/26/10 11:22 PM 01/26/10 11:22 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	For a Chrysler there are 2 sizes... 4 cyl and V-8 and if your using a V-8 PCV thats the larger of the two

Re: Are there different flow rate PCV valves? [Re: 69MOPE] #595148 01/27/10 12:17 AM 01/27/10 12:17 AM
Joined: Oct 2007 Posts: 4,206 New York polyspheric master
polyspheric master Joined: Oct 2007 Posts: 4,206 New York	It will, 8 CFM is a common measurement. However: it admits only air (if your ring seal is good), and drops the vacuum in your idle and transition slots. It may work, but not exactly the same way and will take some tweaking. You could just admit regulated air via banked solenoids, or an adjustable valve. Have you tried cracking the secondaries slightly? Boffin Emeritus

Re: Are there different flow rate PCV valves? [Re: polyspheric] #595149 01/27/10 08:17 AM 01/27/10 08:17 AM
Joined: Aug 2003 Posts: 2,466 Answering the call of the wild T ThermoQuad top fuel
ThermoQuad top fuel T Joined: Aug 2003 Posts: 2,466 Answering the call of the wild	I don't know about flow rates but this one mopar pn 4343581 color black seems to work better than the gray one 3671076. 4343481 was used in 1990 for trucks with a 360 & dual exhaust.

Re: Are there different flow rate PCV valves? [Re: 69MOPE] #595150 01/27/10 01:39 PM 01/27/10 01:39 PM
Joined: Aug 2003 Posts: 43,163 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,163 Bend,OR USA	I use two PCV valves, one in each cast aluminum valve cover and two breathers on my motor to help it idle at 850 RPM in gear, I used a vacume Tee to hook the two together to the vacume port on the carb The cam(solid roller) is 260 @ .050 on the intake and 266 @ .050 on the exhaust. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Are there different flow rate PCV valves? [Re: Cab_Burge] #595151 01/27/10 11:27 PM 01/27/10 11:27 PM
Joined: Oct 2005 Posts: 312 Alberta, Can JUST_N_TIME enthusiast
JUST_N_TIME enthusiast Joined: Oct 2005 Posts: 312 Alberta, Can	Do you happen to have a part # or number on the valve you could provide us? Why 2? thanks

Re: Are there different flow rate PCV valves? [Re: JUST_N_TIME] #595152 01/27/10 11:56 PM 01/27/10 11:56 PM
Joined: Aug 2003 Posts: 43,163 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,163 Bend,OR USA	Both valves are metal V8 1968 era stockers that I had, the reason for two is twice as much vacume leak to help lower the idle RPMs Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Are there different flow rate PCV valves? [Re: Cab_Burge] #595153 01/28/10 01:24 AM 01/28/10 01:24 AM
Joined: Oct 2005 Posts: 312 Alberta, Can JUST_N_TIME enthusiast
JUST_N_TIME enthusiast Joined: Oct 2005 Posts: 312 Alberta, Can	so do you run 2 vents too?

Re: Are there different flow rate PCV valves? [Re: Cab_Burge] #595154 01/28/10 02:17 AM 01/28/10 02:17 AM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Cab, I could understand 2 pcv valves on one side and breathers on the other but w/a breather AND a pcv valve on the same side doesn`t it defeat the purpose and draw directly from the side it`s on instead of THROUGH the motor? 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Are there different flow rate PCV valves? [Re: Thumperdart] #595155 01/28/10 08:28 AM 01/28/10 08:28 AM
Joined: May 2007 Posts: 1,443 Maryland D Dads426 pro stock
Dads426 pro stock D Joined: May 2007 Posts: 1,443 Maryland	Brett had a petcock on his intake that he would adjust, mainly to lean out the motor so it would warmup faster on alky, but it could be used for the same purpose. The idea in your case is to get the throttle plates back in the transition slots. The petcock may work, but since it is a controlled vacuum leak idle mixture and part throttle will be lean, which you may have to account for with primary jetting/idle mixture. 2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion

Re: Are there different flow rate PCV valves? [Re: JUST_N_TIME] #595156 01/28/10 10:06 AM 01/28/10 10:06 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: so do you run 2 vents too? There really is no reason for 2 vents... the area of one beather/vent is far greater than the area of 2 PCV valves

Re: Are there different flow rate PCV valves? [Re: Dads426] #595157 01/28/10 10:12 AM 01/28/10 10:12 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Brett had a petcock on his intake that he would adjust, mainly to lean out the motor so it would warmup faster on alky, but it could be used for the same purpose. The idea in your case is to get the throttle plates back in the transition slots. The petcock may work, but since it is a controlled vacuum leak idle mixture and part throttle will be lean, which you may have to account for with primary jetting/idle mixture. There is a way around this.... run a throttle switch to a solenoid to open and close a port... T in a added orifice with a solenoid before the orfice and when you let of the pedal it contacts the switch and opens the orifice

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