derek Posted June 4 Share Posted June 4 When we got our truck, it had an aftermarket air cleaner, and after reading the forums and documentation here it seemed like this was not ideal so we've been on the lookout for one that would work for us. We found one that we thought would work so we picked it up. It's not the correct one for our truck, but it fits (barely - the back of it almost touches the cowl, but we were able to get it on there and tightened down with a little trouble). So now we want to figure out how to set it up as best we can for our engine - we are probably overthinking some things, but I have a few specific questions and would appreciate any other advice you guys can give as well. 1. On the backside of the air cleaner, there's a vacuum controlled door that appears that it would connect to what I believe is a cold weather modulator on the side (green). It appears to me that this would be pulling air from the engine compartment if the door was opened. What I am not understanding is when this door should open and the benefit that would provide. 2. It has the metal temperature sensor in the bottom which I understand controls when the door in the snorkel switches between heated and fresh air. Is there supposed to be another sensor in line with this before hooking into the vacuum? 3. What are the other holes on the sides of this air cleaner supposed to hook up to? On one hand, I believe if we sealed up the door on the back, capped the extra holes, and hooked up the vacuum from the metal temp sensor to the engine vacuum that would most match the original air cleaner setup on our truck. But if there is a benefit to using this door and the extra ports on the side, I'd like to understand that and use them for their intended purpose. Photos attached of our aftermarket air cleaner the truck came with and the ford one we found. Link to comment Share on other sites More sharing options...
85lebaront2 Posted June 4 Share Posted June 4 That appears to be a 460 air cleaner. The extra door is held closed by manifold vacuum, so at wide open throttle it allows extra air in to feed that 4180C Holley 4 barrel. Link to comment Share on other sites More sharing options...
derek Posted June 4 Author Share Posted June 4 That appears to be a 460 air cleaner. The extra door is held closed by manifold vacuum, so at wide open throttle it allows extra air in to feed that 4180C Holley 4 barrel. So am I correct in understanding that if it's hooked up to that cold weather modulator, it would prevent it from opening in certain temperatures? Would a 2 barrel 2150 carb benefit from the extra air under these circumstances? Link to comment Share on other sites More sharing options...
85lebaront2 Posted June 5 Share Posted June 5 That appears to be a 460 air cleaner. The extra door is held closed by manifold vacuum, so at wide open throttle it allows extra air in to feed that 4180C Holley 4 barrel. So am I correct in understanding that if it's hooked up to that cold weather modulator, it would prevent it from opening in certain temperatures? Would a 2 barrel 2150 carb benefit from the extra air under these circumstances? Ok, here is the diagram from my 1986 F350 with a 460 engine: The red vacuum lines come from a 4 tube vacuum tap on the intake manifold. The lower tube that points straught to the left connects to the air filter diverter (back side of housing) through the CWM which I believe is a delay valve. The diverter is open with the engine off, and closed by vacuum when running. but at WOT it opens up to provide more air, and you can definitely hear it! The inlet snorkel is temperature controlled by a thermal valve in the lower part of the air filter and is connected to the same vacuum source. It maintains warm air so the engine doesn't stumble at low speeds in cold weather. There is a jacket on the right side exhaust manifold for heat, and the end of the inlet duct goes to a plastic elbow past the radiator so it gets ambient temperature air when driving. You can definitely hear the roar of that 460 and Holley 4 barrel. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted June 5 Share Posted June 5 That appears to be a 460 air cleaner. The extra door is held closed by manifold vacuum, so at wide open throttle it allows extra air in to feed that 4180C Holley 4 barrel. So am I correct in understanding that if it's hooked up to that cold weather modulator, it would prevent it from opening in certain temperatures? Would a 2 barrel 2150 carb benefit from the extra air under these circumstances? The CWM is a metal disc in the floor of the housing. The green/black plastic thing in the side, up by the coil is just a delay, to add hysteresis to the flap's motion. If vacuum drops a lot for more than a few seconds the flap inside the plastic shroud opens providing more (if hotter) air than can get through the snorkel alone. I can't say if a 400 really pulls as much CFM as a 460, (certainly not through a 2V) TTBOMK only 460's came with this air cleaner housing. (Thanks Again Bill! ) Link to comment Share on other sites More sharing options...
derek Posted June 5 Author Share Posted June 5 The CWM is a metal disc in the floor of the housing. The green/black plastic thing in the side, up by the coil is just a delay, to add hysteresis to the flap's motion. If vacuum drops a lot for more than a few seconds the flap inside the plastic shroud opens providing more (if hotter) air than can get through the snorkel alone. I can't say if a 400 really pulls as much CFM as a 460, (certainly not through a 2V) TTBOMK only 460's came with this air cleaner housing. (Thanks Again Bill! ) That’s not my understanding from the documentation section unless I’m reading it incorrectly. It’s referring to the CWM as a cold weather module and then additionally it speaks of a bimetal sensor, which I understand to be the one in the bottom. From the “operation” tab in the air cleaner section of documentation it sounds like the CWM is in line with the bimetal sensor, and that it overrides it when ambient temp is within a certain range. I had assumed the green thing was the CWM but if that’s a delay valve then I’m guessing we don’t have a CWM and may need to find one of those, and that may go in one of the extra holes we have in the side of the air cleaner? Link to comment Share on other sites More sharing options...
derek Posted June 5 Author Share Posted June 5 Ok, here is the diagram from my 1986 F350 with a 460 engine: The red vacuum lines come from a 4 tube vacuum tap on the intake manifold. The lower tube that points straught to the left connects to the air filter diverter (back side of housing) through the CWM which I believe is a delay valve. The diverter is open with the engine off, and closed by vacuum when running. but at WOT it opens up to provide more air, and you can definitely hear it! The inlet snorkel is temperature controlled by a thermal valve in the lower part of the air filter and is connected to the same vacuum source. It maintains warm air so the engine doesn't stumble at low speeds in cold weather. There is a jacket on the right side exhaust manifold for heat, and the end of the inlet duct goes to a plastic elbow past the radiator so it gets ambient temperature air when driving. You can definitely hear the roar of that 460 and Holley 4 barrel. Thanks Bill, I that diagram helps. Do you still have this air cleaner on your engine? If so, would it be possible for you to send a picture of what the holes in the sides are hooked to or filled with so I can better visualize what we are looking for? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted June 5 Share Posted June 5 Thanks Bill, I that diagram helps. Do you still have this air cleaner on your engine? If so, would it be possible for you to send a picture of what the holes in the sides are hooked to or filled with so I can better visualize what we are looking for? Bill now has sequential port fuel injection from a '96 Cali or Massachusetts 460. I have his air cleaner. There were two plastic elbows attached there, those hoses fed the twin air pumps. If you don't have air pumps, and want to plug the holes I can show you the rubber Dorman master cylinder seals I've used to block them off. Link to comment Share on other sites More sharing options...
derek Posted June 5 Author Share Posted June 5 Bill now has sequential port fuel injection from a '96 Cali or Massachusetts 460. I have his air cleaner. There were two plastic elbows attached there, those hoses fed the twin air pumps. If you don't have air pumps, and want to plug the holes I can show you the rubber Dorman master cylinder seals I've used to block them off. https://forum.garysgaragemahal.com/file/n154557/IMG_20240605_095544_HDR.jpg oh okay yeah that would definitely be helpful. On the other side we have an extra hole next to the green thing, is it just blocked off too on yours? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted June 5 Share Posted June 5 Bill now has sequential port fuel injection from a '96 Cali or Massachusetts 460. I have his air cleaner. There were two plastic elbows attached there, those hoses fed the twin air pumps. If you don't have air pumps, and want to plug the holes I can show you the rubber Dorman master cylinder seals I've used to block them off. https://forum.garysgaragemahal.com/file/n154557/IMG_20240605_095544_HDR.jpg oh okay yeah that would definitely be helpful. On the other side we have an extra hole next to the green thing, is it just blocked off too on yours? That is for the breather filter. There is a (sorta) curved plastic tray that holds a piece of white Scotch Brite stuff. A forked metal clip on the outside, and an elbow with a hose that goes to the breather where you fill the oil on the front of the valve cover. Do you want pictures??? Link to comment Share on other sites More sharing options...
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