Dog dish explanation
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Dog dish explanation
Hey there...my second post on this forum 
Wondering if anyone could walk me through a couple of things I have on my 1974 F250. The " dog dish " has what looks like an oil filter (I know it's not) on the drivers side of the air cleaner housing...what is this for?? Also, the passenger side has a tube running from it to the manifold...it also has some sort of a spring loaded flapper valve in it as well...I would think it is to mix the cold air coming down the shaft from the front of the truck and the hot air rising up the tube from the manifold but how does the flap open and do I really need all of this or can I simply pull all of that off and go with a standard Chrome air cleaner with exposed air filter...?
thanks
Wondering if anyone could walk me through a couple of things I have on my 1974 F250. The " dog dish " has what looks like an oil filter (I know it's not) on the drivers side of the air cleaner housing...what is this for?? Also, the passenger side has a tube running from it to the manifold...it also has some sort of a spring loaded flapper valve in it as well...I would think it is to mix the cold air coming down the shaft from the front of the truck and the hot air rising up the tube from the manifold but how does the flap open and do I really need all of this or can I simply pull all of that off and go with a standard Chrome air cleaner with exposed air filter...?
thanks
Posting Guru
Joined: Aug 2010
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From: Knoxville, TN
I'm not sure about dog dishes or oil filters, but the blending door you're talking about does exactly what you think: it draws in hot air from around the exhaust for better warm-up in cold weather, and switches to cold air from behind the grille for better power/efficiency once the temperature comes up.
The door is vacuum-actuated. There should be a manifold vacuum line going to a bi-metallic switch in the air cleaner that opens/closes based on temperature, then the switched side of that goes to the actuator on the snorkel. If it's not hooked up, then you'll always be drawing cool air (which is what you normally want anyway).
As for switching to an exposed-element air cleaner, you could ... but then you're always drawing hot air from under the hood, which isn't good from a power/efficiency perspective.
The door is vacuum-actuated. There should be a manifold vacuum line going to a bi-metallic switch in the air cleaner that opens/closes based on temperature, then the switched side of that goes to the actuator on the snorkel. If it's not hooked up, then you'll always be drawing cool air (which is what you normally want anyway).
As for switching to an exposed-element air cleaner, you could ... but then you're always drawing hot air from under the hood, which isn't good from a power/efficiency perspective.
Fleet Mechanic
Joined: Jun 2013
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Now that would be the devil with a Turbo.. just sayin...
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Bkaul, that's what I thought about the blending door. Thanks. So as far as the vacuum line, I know exactly what you mean but this does not nor has it ever had a vacuum line...that's why I am unsure of how or if it actually works. I have recently put on an Edelbrock intake as well as an Edelbrock carb...running seriously hot but that's another post..lol. That is why I figured I could just do away with the entire set up and go with an aftermarket open style filter set up...
Thanks Mike...not sure why the heck Ford would have done that...never heard of that before...r u pullin my leg?? Lol
Thanks all...
Thanks Mike...not sure why the heck Ford would have done that...never heard of that before...r u pullin my leg?? Lol
Thanks all...
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Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
From the Ford parts catalog:
Chamber assy., air cleaner resonance
D3TZ-9E805-A
That's the part number for the "oil filter" on the side of the air filter.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Nope, no particular reason. I prefer stock vs. modified but that's just me. It's your truck, build it like YOU want. From an operational standpoint, no difference between stock and aftermarket air filters (ignoring efficiency and effectiveness claims).
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