another air cleaner routing question. Sorry

[Juiceman]

I searched the posts, but really can't find what I need. I am looking to go back to an original style air cleaner, but with my current set up, I am trying to figure out the hose routing. The air cleaner doesn't have any of the "side" ports (catalyst or cold weather). I believe one of the ports has to go to the passenger side valve cover. Does the other go to the carb since that is where the current value cover goes - my Chilton's looks like it is "open"? Also, would the small vent tube on the air duct assembly go to the bottom of the air cleaner? That is what it looks like in the diagram. I am wondering if one of the small ports on the bottom of the air cleaner would go to the small inlet on the valve cover (currently open). Here are pics. My current aftermarket air cleaner is not vented up to anything. I know lots of questions. Sorry Thanks John

 

[broncodriver99]

The black plastic nipple on the flat part of the underside of the air cleaner would be connected with a hose to a nipple that would replace the PCV valve currently in the passengers side valve cover. You would need to acquire a factory style oil fill cap for the drivers side valve cover and place the PCV valve there. The PCV valve hose would then be routed to wherever it is connected currently, or any other nipple on the carb that is properly sized and is manifold vacuum(there may be a couple with an aftermarket carb). The small tube connectors on the bottom of the bowl part of the air cleaner are a thermal switch that operates the pre-heater damper door in the snorkel of the air cleaner. If you don't have the exhaust manifold heat shield, elbow, and hose you don't have to hook it up. Just make sure the damper door is open. If you do have the pre-heater parts, a vacuum hose would go from manifold vacuum(the vacuum tree where your power brake booster is connected is a good place) to one side of the switch and the other nipple on the switch would go to the nipple on the damper motor(the round part on the snorkel of the air cleaner). The black plastic nipple sticking out of the back corner of the bowl part of the air cleaner is the connection for the hose that comes from the charcoal canister. If you no longer have the canister and hose you can just leave it open.

 

[broncodriver99]

You can also just leave your PCV setup the way it is and cap the nipple on the underside of the air cleaner.

 

[73azbronco]

So there are no aftermarket replacements for those aircleaner connection points> Mine are long gone.

 

[broncodriver99]

So there are no aftermarket replacements for those aircleaner connection points> Mine are long gone.

The pre-heater parts? The corrugated hose is available. The plastic elbow and manifold shield are not available aftermarket. Finding used ones is like finding hen's teeth. I looked for years for a heat shield and only ever found one, which I bought immediately. They are just sheet metal so they usually rust away. The Bronco was the only vehicle to use that particular heat shield.

 

[jckkys]

Do you have a charcoal canister? The '76-'77 is a white plastic boxy container with large and small hose nipples on top. The large one gets a corrugated aluminum hose to the 3/4" nipple on the back of the air cleaner. Earlier '73-'75s had a round can on the frame. Your profile says you have a '77. Your carb looks like a List#1850, that's a 600 CFM made as a universal application so the PCV nipple is on the rear throttle bores. Ford always had PVC routed to the front throttle bores. I think it helps distribution. The '77s had a 3/8" nipple on the front of the carb spacer with a 3/8" steel tube to the oil filler cap with the PCV valve and 90 degree hose nipple with a short hose connecting this to the steel tube. A vacuum hose from the vacuum tree that the power brake booster uses. This has small nipples one gets a hose to the bi-metal thermal vacuum valve nipple on the bottom of the air cleaner near the wing nut. The other nipple gets a hose to the vacuum motor on the intake snorkel. The exhaust manifold head riser shield is hard to find. This;http://www.ebay.com/itm/1973-1977-E...ash=item237dec3741:g:j1oAAOSw~AVYonoO&vxp=mtr, should be behind your battery and needs to be connected to the air cleaner snorkel with square flex hose.

 

[Juiceman]

Do you have a charcoal canister? The '76-'77 is a white plastic boxy container with large and small hose nipples on top. The large one gets a corrugated aluminum hose to the 3/4" nipple on the back of the air cleaner. Earlier '73-'75s had a round can on the frame. Your profile says you have a '77. Your carb looks like a List#1850, that's a 600 CFM made as a universal application so the PCV nipple is on the rear throttle bores. Ford always had PVC routed to the front throttle bores. I think it helps distribution. The '77s had a 3/8" nipple on the front of the carb spacer with a 3/8" steel tube to the oil filler cap with the PCV valve and 90 degree hose nipple with a short hose connecting this to the steel tube. A vacuum hose from the vacuum tree that the power brake booster uses. This has small nipples one gets a hose to the bi-metal thermal vacuum valve nipple on the bottom of the air cleaner near the wing nut. The other nipple gets a hose to the vacuum motor on the intake snorkel. The exhaust manifold head riser shield is hard to find. This;http://www.ebay.com/itm/1973-1977-E...ash=item237dec3741:g:j1oAAOSw~AVYonoO&vxp=mtr, should be behind your battery and needs to be connected to the air cleaner snorkel with square flex hose.

no charcoal canister and no heat shield. I have been scouring the pick and pulls for one. I did find one from a Torino that had a 302, but it was rusted and tabs broken off. Also not sure if it would fit. Any idea if anything else used this heat shield (Mustangs?). I will hopefully start working on the routing of the hoses this weekend.

 

[jckkys]

The charcoal canister on '77 Broncos was common to many Ford cars and trucks.

 

[Trappey74]

My air cleaner has the hole in the side of the cleaner but there isn't a hose coming off it. Also no fresh air tube or hot air pickup as well . Is that critical

 

[jckkys]

The '74s had a cold air duct behind the battery like that in my post #6 reference to an ebey auction. The air cleaner snorkel comes up on ebey fairly often. To connect these two, a flexible hose like this one;https://www.4wd.com/p/crown-automot...=CROJ5357889&gclid=CJ2ug9fW29MCFcVlfgodHzsHqA, is used. These are common at parts stores. The heated air intake off the exhaust manifold is hard to find but only helps with cold start warm up. Try BG or Delconick for for some of these parts.

 

[Juiceman]

Finally have the parts in place. Have the original PCV valve. Does anyone have complete original air cleaner that can post detailed pics of the hose routing? Drivers side valve cover to ? (I believe black nipple on the bottom of cleaner). Passenger side valve cover to? (Other nipple on bottoms of air cleaner or carb?). 2 small ports on the bottom of the air cleaner to ? (Small nipple on passenger side valve cover for one and the other go to the hot air damper?). I think that is all of them. I probably need pics or laymans terms. Thanks

 

[Trappey74]

What is the hole on the side of the air cleaner for that looks like a black hose comes out of and to where does it go?

 

[Rustytruck]

The drivers side valve cover fitting goes to pvc fitting under carb. Manifold vacuum. Passengers side valve cover fitting had pvc valve then hose up to the black fitting under the air cleaner housing. This let filtered air into the passengers side valve cover as the suction pulling from the other valve cover drew air, engine blowby and internal contaniments into the intake manifold to be burned in the combustion chambers.

 

[broncodriver99]

The drivers side valve cover fitting goes to pvc fitting under carb. Manifold vacuum. Passengers side valve cover fitting had pvc valve then hose up to the black fitting under the air cleaner housing. This let filtered air into the passengers side valve cover as the suction pulling from the other valve cover drew air, engine blowby and internal contaniments into the intake manifold to be burned in the combustion chambers.

You have it backwards for his air cleaner. The PCV valve goes in the drivers side valve cover(in the oil cap) and the line from it connects to the spacer under the carb if still running the factory carb. The passengers side valve cover should have an elbow/nipple in it that connects with a hose to the nipple on the underside(flat part) of the air cleaner.

 

[jckkys]

After some research I think the '68-'73 heat riser here;http://www.ebay.com/itm/1968-1969-F...T-HEAT-RISER-SHIELD-/162471562299?hash=item25, should work with your '77 manifold. Your OE air cleaner looks like a '73 too. The plastic elbow on the air cleaner could be replaced with the flexible hose or by getting a junk air cleaner like this;http://www.ebay.com/itm/1973-Ford-B...sh=item25d6c3a339:g:Kt8AAOSwcgNZGdcT&vxp=mtr; this one looks more like a '77 but it is trashed and the seller won't get 89 bucks for it. Wait till he figures that out. Bronco Graveyard or delconick may have the parts you need too. You will need a breather elbow in the oil filler cap and a 5/8" emission type hose to the elbow on the bottom of the air cleaner. That Holley List 1850 has no PCV nipple in the front and the tall intake doesn't leave room for a carb spacer with a front nipple like the OE '77 spacer. Your picture #4 of the bottom of the air cleaner shows the thermostatic valve with 2 nipples a hose from one nipple goes to the intake vacuum tree and a hose from the other nipple to the flapper valve on the snorkel.

 

[73azbronco]

You may be surprised I've been seeing the old school air cleaners going for over $125, I've been watching as well.

 

[Juiceman]

You have it backwards for his air cleaner. The PCV valve goes in the drivers side valve cover(in the oil cap) and the line from it connects to the spacer under the carb if still running the factory carb. The passengers side valve cover should have an elbow/nipple in it that connects with a hose to the nipple on the underside(flat part) of the air cleaner.

Thanks for the feedback. The air cleaner is not original, so just trying to make it work best I can. Right now it is running/driving OK, but want to get it hooked up.

I have my carb manual (Holley Street Avenger) and can follow those vacuum lines. I guess my main question is the PCV connection. The carb manual says to connect the PCV hose to the PCV fitting in the carb. Should that get routed thru the air cleaner first or direct from the drivers side valve cover to the carb?

 

[broncodriver99]

The carb manual says to connect the PCV hose to the PCV fitting in the carb. Should that get routed thru the air cleaner first or direct from the drivers side valve cover to the carb?

Directly from the PCV valve in the oil cap on the drivers side valve cover to the port on the carb.

 

[Rustytruck]

So there are no aftermarket replacements for those aircleaner connection points> Mine are long gone.

If your looking for the black pvc fittings on the air cleaner housing you can use metal fittings used for aluminium flex conduit. Paint them black if it bothers you its not stock.

 

[jckkys]

Are you interested in configuring your induction system like an original '77 or any other year early Bronco? The Holley you have in the photos in post #1 isn't a Street Avenger. They all have center hung float bowls. Yours has side hung float bowls. Street Avengers are 4150s and yours is a 4160. Your PCV is connected to the power brake port on the passenger side of the carb. Street Avengers have a 3/8" nipple on the front of the carb base. This is where you would attach the PCV hose to. List 1850s only have a power brake port that you're using for PCV. With a front PVC port on either the carb or spacer, you could put a PCV valve in the oil filler cap the way '77 Broncos had. Then you could use a short 5/8" hose from a breather elbow on the passenger side valve cover to the breather elbow on the bottom of the air cleaner in the photos in post #1. That IS an original '73 Bronco air cleaner. A '77 would have a largely useless 1" hole or 2 in the front. Here;http://www.2040-cars.com/Ford/Bronco/-beautiful-survivor-1977-ford-bronco-ranger--1001910/, is what an original '77 looks like. Study the engine compartment photos. You'll see the PVC valve in the oil filler cap and a steel tube routed to the front of the carb spacer.