PCV valve for the V8 flathead
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Lead Driver
Joined: Dec 2004
Posts: 7,669
Likes: 13
From: San Jose, CA
PCV valve for the V8 flathead
I had this forwarded to me for sharing. Supposed to eliminate blow by and condensation in the crankcase. Has anyone heard of or tried it? Any pros or cons? It's cheap enough to buy for my 51 to have for "just in case".
Jamco Suspension - 49-53 FORD FLATHEAD PCV VALVE KIT Jamco Suspension, Your #1 Source for Hot Rod Brakes and Suspension!
Jamco Suspension - 49-53 FORD FLATHEAD PCV VALVE KIT Jamco Suspension, Your #1 Source for Hot Rod Brakes and Suspension!
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
I wish they'd show where the hoses on the right go, I can't figure out what they're doing. I have PCV I made for less than $10 and it works fine.
https://www.ford-trucks.com/forums/6...or-an-8ba.html
https://www.ford-trucks.com/forums/6...or-an-8ba.html
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
In their defense, that is a nice looking piece with a nice O-ring seal where it plugs into the draft tube hole (Hecho in china no doubt, probably cost them under a buck)
I just can't figure where the hoses are going after the Tee; one to the wipers, perhaps. But the one that goes down is a mystery. I can't see where it connects to the intake, the normal place has a hose on it (for the wipers no doubt).
I just can't figure where the hoses are going after the Tee; one to the wipers, perhaps. But the one that goes down is a mystery. I can't see where it connects to the intake, the normal place has a hose on it (for the wipers no doubt).
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Lead Driver
Joined: Dec 2004
Posts: 7,669
Likes: 13
From: San Jose, CA
In their defense, that is a nice looking piece with a nice O-ring seal where it plugs into the draft tube hole (Hecho in china no doubt, probably cost them under a buck)
I just can't figure where the hoses are going after the Tee; one to the wipers, perhaps. But the one that goes down is a mystery. I can't see where it connects to the intake, the normal place has a hose on it (for the wipers no doubt).
I just can't figure where the hoses are going after the Tee; one to the wipers, perhaps. But the one that goes down is a mystery. I can't see where it connects to the intake, the normal place has a hose on it (for the wipers no doubt).
Start by removing the factory two piece vent tube. To do this, it is easiest to tap it with a hammer to
loosen then pull out. Make sure the hole in the manifold is cleaned of all sharp edges. Use a file or reamer for
this. This is to prevent damage to the “O” ring on the new aluminum valve. Next, rub a little bit of motor oil on
the rubber “O” ring and gently twist and push into the manifold up to the shoulder on the valve.
Now at the base of your carburetor there is a vacuum fitting on the intake manifold that supplies vacuum
to the factory wipers. You will cut this vacuum line and install the supplied “T” fitting between the manifold and
the wipers. Install is now complete.
You will notice an increase in the RPM’s . You will need to adjust the idle on your carburetor now that
you have introduced a new source of air into the manifold. At idle, you should be between 600 and 800 RPM’s.
You are now finished.
This will eliminate blow by smoke from the original vent tube and filler tube as well as keep condensation out of
the crankcase.
www.loosen then pull out. Make sure the hole in the manifold is cleaned of all sharp edges. Use a file or reamer for
this. This is to prevent damage to the “O” ring on the new aluminum valve. Next, rub a little bit of motor oil on
the rubber “O” ring and gently twist and push into the manifold up to the shoulder on the valve.
Now at the base of your carburetor there is a vacuum fitting on the intake manifold that supplies vacuum
to the factory wipers. You will cut this vacuum line and install the supplied “T” fitting between the manifold and
the wipers. Install is now complete.
You will notice an increase in the RPM’s . You will need to adjust the idle on your carburetor now that
you have introduced a new source of air into the manifold. At idle, you should be between 600 and 800 RPM’s.
You are now finished.
This will eliminate blow by smoke from the original vent tube and filler tube as well as keep condensation out of
the crankcase.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
Hmmm... OK. I don't have vac wipers, but it seems to me you need to use a separate vac source for the wipers when using PCV, or you'll think you are going up a hill even at a stoplight. (True whether you build your own or use the kit).
Hotshot
Joined: Oct 2009
Posts: 16,173
Likes: 4,781
From: Burbank, WA
I looked at it and it says to tee into the wiper vacuum line. The hose on the right goes from the manifold carb base to the wiper motor. Without vacuum wipers, you'd just plug into the manifold. If you look at the size of the hose, it's tiny like the wiper hose. Not nearly as big as an OEM PCV system would be. It's a cool piece, but I think a better system could be made for far less, like Ross said, using a larger, proper PCV sized hose. My 2c.
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Logistics Pro
Joined: Jun 2010
Posts: 4,963
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From: East KY
So how much do you guys think that will affect vacuum supers? As for the increased RPM's, I am sure they are right, but isn't that replacing one air source for another one?
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Fleet Owner
Joined: Jul 2004
Posts: 27,294
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From: NM
The vacuum tap for the wipers under the carb has an orifice, very small, probably 1/16". I was tempted to open it up to allow more flow when I did PCV. If I had vacuum wipers I would for sure, or use a separate tap.
Hotshot
Joined: Oct 2009
Posts: 16,173
Likes: 4,781
From: Burbank, WA
The flathead engine I'm going to use came from a big truck, so it has an extra, larger port on the intake carb base that went to the power brake booster. I figure that would be a good place to hook up a PCV. It's sized about right.
Senior User
Joined: Jun 2008
Posts: 347
Likes: 0
From: Wilmington Delaware
I lost use of my vac wipers completely after installing it on my flattie. Also had the problem of blow by entering my cab thru the vac wiper motor under dash. I ended up disconecting my wipers from the vac line since i still have a primered body and dont drive it in the rain.
Hotshot
Joined: Oct 2009
Posts: 16,173
Likes: 4,781
From: Burbank, WA
Do those pumps work well? I found one on ebay to use on my engine. It sounds like it should be a good way to go to have better working wipers. Not that I'm too worried about it with our annual precip of only 7", and it's not going to be a daily driver. But I did question how it hooks up. The instructions in the service manual are unclear to me.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
I would do it by running a vacuum reservoir, with two lines to it: one from the manifold, with a check valve in it (easy to find at the boneyard, all cars use them for the HVAC control vacuum), and the other from the diaphragm pump, also with a check valve. How well do they work? Couldn't tell you but it has to be pretty good, the State of California required them on all cars/trucks with vac wipers. And they know what's best for all of us!
I don't see how you could get blowby into the cab thru a vac hose that is sucking air out of the cab, John? Something must be wrong there. A check valve would prevent it for sure.
I don't see how you could get blowby into the cab thru a vac hose that is sucking air out of the cab, John? Something must be wrong there. A check valve would prevent it for sure.
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