Slant Six Forum
https://www.slantsix.org/forum/

What kind if PCV valve do you use ?
https://www.slantsix.org/forum/viewtopic.php?t=36757		 Page 1 of 2
Author:  00spy [ Sun Aug 16, 2009 1:27 pm ]
Post subject:  What kind if PCV valve do you use ?
The plastic one I have on now whistles. I kept thinking it was a vacuum leak somewhere. I have a Holley 1920 on it , Let me know what you use , and do all the plastic ones whistle.





Thanks
Dave
Author:  Aggressive Ted [ Sun Aug 16, 2009 2:13 pm ]
Post subject: 
Hi!

Mine did the same and is bother some and annoying. I am using the Spectre version with the built in chrome cap.

Installed a Spectre Breather w/Dorman #42344 gasket 11/2008 This is the PCV unit I used http://www.spectreperformance.com/#CATALOG.4284
With this air breather http://www.spectreperformance.com/#CATALOG.4277

Take a look at the link below to see what I mean. Just click on the red link to view the PCV. When the picture comes up double click on it to put it into full size slide show mode.
Author:  00spy [ Sun Aug 16, 2009 2:37 pm ]
Post subject: 
Thanks Ted,
Is that the PCV valve for the slant six , or it fits ,and is working well for you. It looks like the opening for the oil filler cap is bent a little, you can kind of see a small gap with it on, would that affect the PCV valve in any way?



Thanks
Dave
Author:  cavisco [ Sun Aug 16, 2009 6:24 pm ]
Post subject: 
I have found that most of the high volume auto parts stores have consolidated their line of pcv valves so that now, one part number covers far more applications than in the past, meaning the pcv valve the computer says fits may not be exactly what the OEM spec'd when the car was new.

I went through several pcv valves on my old Ford truck before I finally just went to the dealer and bought an oem replacement. The spring tension was noticably lower on the oem motorcraft part than on the parts store junk. The parts store pcvs were allowing oil to blow up the breather tube soiling the filter. The oem part does not do this.

Scott.
Author:  Aggressive Ted [ Sun Aug 16, 2009 11:04 pm ]
Post subject: 
Dave,

Nothing is bent, the type of hose is a super reinforced and a tight fit. That is as far as I could get it to slide on.
The Spectre unit is heavy duty and no noise...... and it works great! :D

The Spectre is a generic PCV as far as I can tell, not special for a slant six. As for performance the engine idles at 750 rpm out of gear at 18" of vacuum and 16" in gear at 650 rpm. So no vacuum change between it and the plastic MOPAR style PCVs.

I went through several of the stock plastic ones and they do not last too long before they start making noise even with synthetic oil. NAPA PCVs seemed to be no better than a Wells, Fram or MOPAR. That is why I tried the Spectre. It's all metal, no plastic.
Author:  00spy [ Mon Aug 17, 2009 2:26 pm ]
Post subject: 
I'm sorry Ted , I was not talking about yours . I was talking about my valve cover ,was just wondering would it make a difference if the oil filler cap was not sealed to the valve cover when it is on.Thanks cavisco, I am definetly looking into the OEM also

On another note Ted , I did make another ported vacuum port for the vapor canister,I put it beside the vacuum advance port,and drilled so it was a little higher than the vacuum advance ,so the vacuum advance would get vacuum first.

Thanks for all the help
Dave
Author:  Aggressive Ted [ Mon Aug 17, 2009 2:55 pm ]
Post subject: 
OOspy,
Quote:
just wondering would it make a difference if the oil filler cap was not sealed to the valve cover when it is on.Thanks cavisco, I am definetly looking into the OEM also
I keep my set up very tight, with good rubber grommets in the valve cover. If any air gets pulled in the engine, I want it coming from the filtered air from inside the air cleaner, near the throat. No more dirty air from a stock air breather.
Quote:
I did make another ported vacuum port for the vapor canister,I put it beside the vacuum advance port,and drilled so it was a little higher than the vacuum advance ,so the vacuum advance would get vacuum first.
Very cool! That should work well if your about 90 degrees from the distributor port. Is it working well for you? Good vacuum at both ports when you crack the throttle?
Author:  00spy [ Mon Aug 17, 2009 3:35 pm ]
Post subject: 
I just put everything back together, I don't have much time to work on it , so a little when I can . I have not checked the vacuum on the ports yet , but I think it is going to work well.


Dave
Author:  00spy [ Mon Aug 17, 2009 4:17 pm ]
Post subject: 
Well, I checked the vacuum ,the distributor port is good, but I am getting nothing on the new port. This is what you call a learning experience I guess :lol: . I will take the carb off and check for leaks around the new port, and if that is good , I guess the hole for the port might be too high, and I might have to lower it a little.


Dave
Author:  Aggressive Ted [ Mon Aug 17, 2009 9:47 pm ]
Post subject: 
Dave,


Don't pull it yet.........
You might check it at higher rpm. It may kick in later with more flow, say 2000 rpm or more so it should still draw out the gases.

Maybe with the larger diameter the pressure drop is greater compared to the small distributor port.

I have a hole in mine half way up the barrel over the top of the venturi that I use for water injection. It pulls a nice stream and puts out a fine mist from 2000 rpm on up.

Do some more testing to see at what rpm it kicks in and if going to a smaller diameter port changes anything.

Hang in there....
Author:  00spy [ Mon Aug 17, 2009 11:21 pm ]
Post subject: 
Ok, what size hole did you go with to exit through the carb, I used a 1/16 in. drill bit , the smallest I could find .Is that too small, or should I up it one.


Thanks
Dave
Author:  Aggressive Ted [ Tue Aug 18, 2009 10:24 am ]
Post subject: 
1/8 to 3/32 should work. 1/16 may not do too much depending on where you drilled the hole. Got a picture you can email or post? Can you hook up a vacuum gauge to it to check at what rpm it starts pulling?
Author:  00spy [ Tue Aug 18, 2009 1:26 pm ]
Post subject: 
Ok,I hooked up a gauge to the new port ,and it starts to pull vacuum around 2800 RPM and at 3000 RPM it is hitting 10". It looks like I should up the size a little and test it then. What do you think. I haven't tried hooking both of them up to gauges yet , I guess after I get that one straightened out ,I will go from there.
I can't get a pic right now ,but it is just above the slit for the vacuum advance. It is not to far up .


Thanks
Dave
Author:  Aggressive Ted [ Tue Aug 18, 2009 1:35 pm ]
Post subject: 
Try a 1/8" drill or so....and test it for vacuum pull.
You can always JB Weld it up.
Author:  00spy [ Tue Aug 18, 2009 3:48 pm ]
Post subject: 
I think I found why it was not pulling much vacuum, and it took a high amount of RPM to get some vacuum. :oops:
When I was drilling the hole to go into the inside of the carb, I wanted it high as pssible , well with as small of a hole I used , the top part of the nipple I put in pretty much covered up the hole.
I stepped up the hole some , and made sure it was not blocked.I have to put some J B Weld around the nipple to make sure it has a good seal.
Would j B Weld be the best product for that ?

Thanks
Dave
Page 1 of 2 All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/