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Re: Downdraft tube education
Mitch4x4 #1212617 Tue Apr 11 2017 10:40 AM
Joined: Apr 2005
Posts: 2,837
C
'Bolter
The PCV keeps the crank case under a negative pressure so anything st the seals or gaskets is being drawn in rather than pushed out.


Evan
Re: Downdraft tube education
coilover #1212694 Tue Apr 11 2017 10:14 PM
Joined: Jan 2014
Posts: 1,622
J
'Bolter
Originally Posted by coilover
The PCV keeps the crank case under a negative pressure so anything st the seals or gaskets is being drawn in rather than pushed out.


Makes sense.

Last edited by JW51; Wed Apr 12 2017 03:02 AM.
Re: Downdraft tube education
Mitch4x4 #1212702 Tue Apr 11 2017 10:52 PM
Joined: Mar 2002
Posts: 9,111
'Bolter
I put a PCV system on mine using a modern valve for about the same displacement engine. I also have a bypass filter. I change the oil at 3000 miles and it doesn't darken any faster then a modern car.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Downdraft tube education
Mitch4x4 #1212753 Wed Apr 12 2017 02:44 AM
Joined: Dec 2001
Posts: 15,526
'Bolter
...I a PCV valve on my 261 using the info provided by... I think Dave. I havent' driven it on the road but it seems to work great and Dave...or maybe it was Deve, even suggested the PVC number to use and why.
Yes, it all makes sense.

EDIT: and I just want to give a shout out to Brad Allen for all the info and great stuff he provides for us. THANK YOU BRAD.

Last edited by Achipmunk; Wed Apr 12 2017 02:44 AM.

1937 Chevy Pickup [stovebolt.com]

1952 Chevy Panel [stovebolt.com]
52 Chevy Panel [photos.app.goo.gl]

Pictures in my Photobucket [s140.photobucket.com]

1950 Chevy Coupe
https://photos.websearch.com/share/...Nko1cUJCNFFMTVFEUnNRbjFhNTFPc1J4YWV4cmRB



I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile
Re: Downdraft tube education
Mitch4x4 #1212807 Wed Apr 12 2017 03:21 PM
Joined: Oct 2016
Posts: 687
N
Shop Shark
If you are already using the single port on a Fenton intake manifold for a power brake booster, how would you choose to plumb a PCV system into it? Is there a way to set it up so that you don't have to drill another hole in the manifold?


Dave

Clutch head screws have stolen too many hours from my life....

1950 Chevy 3600 (resto-something) - the work resumes...
https://goo.gl/photos/8t5mLuj4JZebvGq49

1963 GMC Widebed Custom

1951(?) GMC flatbed that is now a flower garden:
https://goo.gl/photos/H79pvKhHLxjNiR149

1968 Chevy II Nova- not running, waiting for me to finish the '50 3600
https://goo.gl/photos/Dh7q4pt3WSkKjjFr9
Re: Downdraft tube education
Mitch4x4 #1212810 Wed Apr 12 2017 03:42 PM
Joined: Jan 2000
Posts: 2,145
J
'Bolter
I used a brass 'T', one side to PCV other to vac wipers or what ever.


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy [stovebolt.com]
1953 Chevy 3/4-ton Factory Stakebed [stovebolt.com]
Re: Downdraft tube education
Mitch4x4 #1212818 Wed Apr 12 2017 04:56 PM
Joined: Oct 2016
Posts: 687
N
Shop Shark
JiMerit,

I thought about that, but was concerned that I would run into erratic/low vacuum at the booster from sharing a port with something that is actually "flowing" , or that I might get oil vapor working it's way into the booster (which is mounted lower, under the floor). Perhaps that should not be a concern, I don't know.


Dave

Clutch head screws have stolen too many hours from my life....

1950 Chevy 3600 (resto-something) - the work resumes...
https://goo.gl/photos/8t5mLuj4JZebvGq49

1963 GMC Widebed Custom

1951(?) GMC flatbed that is now a flower garden:
https://goo.gl/photos/H79pvKhHLxjNiR149

1968 Chevy II Nova- not running, waiting for me to finish the '50 3600
https://goo.gl/photos/Dh7q4pt3WSkKjjFr9
Re: Downdraft tube education
Mitch4x4 #1212882 Thu Apr 13 2017 01:35 AM
Joined: Feb 2004
Posts: 22,980
H
'Bolter
Loop the vacuum line up near the top of the firewall before routing it to the booster under the floor to prevent oil from getting where it doesn't belong. The PCV has a pulsating flow and it shouldn't interfere with the vacuum going to the booster. Most brake boosters have a one-way check valve built into the fitting that goes into the vacuum chamber, so there's at least one brake application with power assist available in case of an engine stall.
Jerry


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Re: Downdraft tube education
Mitch4x4 #1212918 Thu Apr 13 2017 01:25 PM
Joined: Mar 2017
Posts: 13
D
New Guy
Even though there's lots of talk about converting over to a PCV, I would still like to keep my Road Draft Tube. What is the best way to clean out a clogged tube?
Thanks
DougR


1962 C10 shortbed
Re: Downdraft tube education
Mitch4x4 #1213199 Sat Apr 15 2017 04:55 PM
Joined: Oct 2016
Posts: 687
N
Shop Shark
Thanks, Jerry- I will give that a try.

Doug- I usd kerosene. Popped off the top and let it soak overnight. I had to use a pick to clean out some of the baffle holes. Lots of filling and flushing.


Dave

Clutch head screws have stolen too many hours from my life....

1950 Chevy 3600 (resto-something) - the work resumes...
https://goo.gl/photos/8t5mLuj4JZebvGq49

1963 GMC Widebed Custom

1951(?) GMC flatbed that is now a flower garden:
https://goo.gl/photos/H79pvKhHLxjNiR149

1968 Chevy II Nova- not running, waiting for me to finish the '50 3600
https://goo.gl/photos/Dh7q4pt3WSkKjjFr9
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