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PCV Valve setup for 1955 Dodge 270
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'55-3Hemi
Posted 2023-02-07 11:33 AM (#627419)
Subject: PCV Valve setup for 1955 Dodge 270



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Hi all!

I had posted a reply to Dave about his question about the choke tube that came with a nice rebuilt WCFB for his 1956 D500 Custom Royal and it prompted me to inquire about a pcv valve setup that I cobbled up to use on my 270 hemi (1955 DODGE Custom Royal Lancer) with power brakes. This is my first attempt to use a pcv valve on the 270 but I would like to inquire any comments or suggestions from members who are far more qualiied in this area. I am learning and would like any suggestions.

Basicaly I used the vacuum port located on the rear of the 4bbl intake for the power brake booster (The 2bbl intake has the same port) and added 3/8" copper tubing with a flared end in to hook up into the PB fitting. From there I ran tubing to the road draft pipe exit (valve tappet chamber cover) I purchased from Hot Heads the PCV valve and rubber groument that presses in where the draft tube was mounted. From there I ran tubing to a "T" and used that end as the new vacuum source for  the power brakes.  My factory WCFB does not have a vacuum port for a PCV valve. One  question that I have is that will the PCV valve use too much vacuum such that it may affect the PB booster operation. I have  not looked into any spacers that would fit under the WCFB for fear that this may change the installed height of my convered 4bbl oil bath cleaner to paper filter which is taller since the conversion. (Using a 1956 Chrysler New Yorker 4bbl oil bath cleaner)

 

Thanks in advance

Robert





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(2-20230207_072639.jpg)



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Attachments 1-20230207_072629.jpg (93KB - 41 downloads)
Attachments 2-20230207_072639.jpg (103KB - 39 downloads)
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56D500boy
Posted 2023-02-07 11:44 AM (#627421 - in reply to #627419)
Subject: RE: PCV Valve setup for 1955 Dodge 270



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To quote "Hot Hemi Heads" website regarding their retrofit PCV kit:

"Original sheet metal valley covers employed a road draft tube to vent crank case gases directly into the atmosphere, siphoning the vapors at the back of the engine and exiting them low at the back of the block, under the floor. This kit's grommet installs in the original road draft tube location on the stock valley cover, which allows a modern PCV valve to be used. The PCV can then be connected to a vacuum port on the intake, at the base of the carb or even on an air cleaner. No modifications to your stock valley pan are required."

Personally, I would avoid any/all vacuum ports on the intake and route a hose to the air cleaner so a) the gases are filtered and b) all cylinders get some, relatively evenly. I have seen and probably saved photos of an oil bath air cleaner with a retrofit external flanged nipple for the PCV hose. I will look more and post the photo when/if I find it.

https://www.hothemiheads.com/dodge/valley_pans_related/pcv_stock_val...



Edited by 56D500boy 2023-02-07 11:44 AM
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56D500boy
Posted 2023-02-07 12:13 PM (#627422 - in reply to #627421)
Subject: RE: PCV Valve setup for 1955 Dodge 270



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56D500boy - 2023-02-07 8:44 AM

Personally, I would avoid any/all vacuum ports on the intake and route a hose to the air cleaner so a) the gases are filtered and b) all cylinders get some, relatively evenly. I have seen and probably saved photos of an oil bath air cleaner with a retrofit external flanged nipple for the PCV hose. I will look more and post the photo when/if I find it.


This is NOT the photo I was thinking of but it does show another approach to sucking crankcase vapours/blowby into the carburetor. I guess the add-on nipple on the air cleaner lid is similar to what I was thinking of.

I think something on the bottom or back side your converted oil-bath might be better, somewhere near the rear so it is hidden (??)

Oh boy. You just gave me another project to do.





Edited by 56D500boy 2023-02-07 12:53 PM




(OneExampleOfAPCVvalveOnAnOilBathAirCleaner.jpg)



(OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_1.jpg)



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Attachments OneExampleOfAPCVvalveOnAnOilBathAirCleaner.jpg (149KB - 47 downloads)
Attachments OEOilBathAirCleanerConvertedToPaper_WithPaperFilters_1.jpg (116KB - 48 downloads)
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Powerflite
Posted 2023-02-07 3:52 PM (#627427 - in reply to #627419)
Subject: Re: PCV Valve setup for 1955 Dodge 270



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Location: So. Cal		To answer your question, the PCV has a flow limiter that prevents too much air flow into your intake. So it shouldn't affect your vacuum level very much.

Burning the unfiltered gases in your motor isn't an issue if you have a higher power ignition system. Your engine burns more oil during it's normal operation than it does from the addition of a PCV, so there isn't really an issue there. But if it is all routing to only 2 cylinders, then it can be more of a concentration that could eventually cause fouling. But in practice, you can get away with a lot if you aren't still running with points & the original coil.

If you run it to the air cleaner, you won't get the benefit of keeping the crankcase vacuumed clear of these gases and your oil quality & gaskets will suffer more than it would otherwise. But that setup is much better than the original draft tube, in terms of not having to smell your motor while idling after a run.

Most of the early AFB's have an undrilled port location that could be drilled, tapped and used for a PCV connection. I doubt the WCFB has anything similar, but you might be able to tap your intake at a more central spot to distribute it better. But I have run a number of my cars just as you have it, and didn't really notice anything detrimental from it.


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56D500boy
Posted 2023-02-07 8:50 PM (#627430 - in reply to #627422)
Subject: RE: PCV Valve setup for 1955 Dodge 270



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Found another photo with a PVC hose fitting on a 56 Dodge oil bath air cleaner housing. Still not what I was thinking that I had but it will do (for now).

Also found the factory engine diagram that shows the Road Draft Tube as Item 100 "Pipe" (gee thanks for the detailed description - but it does show Item 72 "Air Cleaner" that some applications got for their Draft tube applications).

Checked out Summit racing to see what they have for air cleaner PVC fittings. I think I would want one that goes straight in from the bottom of my converted oil bath air cleaner. The location of the draft tube is right under the back of the air cleaner so installation could appear almost invisible.





(56Dodge4bblOilBathAirCleanerWithPCVNippleOnPassengerSide.jpg)



(RoadDraftTubeItem100InEngineDiagram.jpg)



(SummitRacingsPCVvalveAirCleanerFittings.jpg)



(56DodgeV8DraftTubeExitingValleyCoverUnderIntakeManifold.jpg)



(56Dodge4bblAirCleanerSittingAboveDraftTubeFittingOnValleyPan.jpg)



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Attachments 56Dodge4bblOilBathAirCleanerWithPCVNippleOnPassengerSide.jpg (144KB - 43 downloads)
Attachments RoadDraftTubeItem100InEngineDiagram.jpg (146KB - 49 downloads)
Attachments SummitRacingsPCVvalveAirCleanerFittings.jpg (145KB - 42 downloads)
Attachments 56DodgeV8DraftTubeExitingValleyCoverUnderIntakeManifold.jpg (149KB - 47 downloads)
Attachments 56Dodge4bblAirCleanerSittingAboveDraftTubeFittingOnValleyPan.jpg (149KB - 48 downloads)
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Mopar1
Posted 2023-02-09 9:26 AM (#627463 - in reply to #627419)
Subject: Re: PCV Valve setup for 1955 Dodge 270



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Location: N.W. Fla.		Re: Photo of hose running from oil fill cap to air cleaner: At least on the Chr hemi, the oil fill cap has a hole in it where air goes through and into the crankcase (gets sucked out the puketube or PCV valve if one is in the location). with the set up shown, how does air get in the crankcase?. I guess if the tube is still being used air would be sucked up it, reverseing flow.
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56D500boy
Posted 2023-02-09 11:40 AM (#627465 - in reply to #627463)
Subject: Re: PCV Valve setup for 1955 Dodge 270



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In my thoughts, the air will be drawn into the crankcase through the many vent holes on the bottom of the filler tube cap (black one in this older photo of my 56 D500's engine bay):





Edited by 56D500boy 2023-02-09 11:41 AM
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Mopar1
Posted 2023-02-09 6:32 PM (#627479 - in reply to #627465)
Subject: Re: PCV Valve setup for 1955 Dodge 270



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56D500boy - 2023-02-09 10:40 AM

.
In my thoughts, the air will be drawn into the crankcase through the many vent holes on the bottom of the filler tube cap (black one in this older photo of my 56 D500's engine bay):



If comment was in response to me: It would on the photo you just posted. I was talking about an earlier one showing a hose going from oil fill cap to the air cleaner.
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56D500boy
Posted 2023-02-10 2:29 AM (#627487 - in reply to #627479)
Subject: Re: PCV Valve setup for 1955 Dodge 270



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Mopar1 - 2023-02-09 3:32 PM
If comment was in response to me: It would on the photo you just posted. I was talking about an earlier one showing a hose going from oil fill cap to the air cleaner.


Sorry, mass confusion.

I guess you mean this one (below). I think that would work *IF* the filler cap did not have vent holes. Then the inlet air for the crankcase ventilation would be the draft tube, i.e. reversed air flow:



Edited by 56D500boy 2023-02-10 2:30 AM
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