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Draft Tubes and PCV valves.
Quote:
Originally Posted by
Jeff W
Looks like modern cars place the intake inside of the air filter. I would assume it as after the paper filter element and this provides particle free air. Doesn't help us unless you want an ugly cobble job.
Hello, Jeff.
Yep. The back of y air cleaner has a plugged off nipple that could be used to draw clean air, but I would have to run a hose across the engine from front to back. It would probably interfere with the throttle or transmission linkage and would be more bother than it would be worth. The paper filter would be better in a theoretically, but it would probably tear in actual use and its appearance would probably bother me every time I lifted the hood.
Quote:
Originally Posted by
Jeff W
Maybe there is a way to get an o-ring in there to provide a tighter seal.
Theoretically that might work. In actuality, the o-ring would probably pop off and fall down the oil fill tube the first time I tried it. :WHATTHE:
Quote:
Originally Posted by
Jeff W
My current engine has the draft tube but still needs the intake type cap. According to the wiki page, this draft tube does not work at slow speeds as the tip of the tube, placed in the vehicles slip stream, does not provide the required vacuum., a problem for mail vehicles and us city dwellers.
I never understood why in 1963 Ford put a PCV valve on the V-8s butl left draft tubes on the sixes. The Wikipedia article explains that a PCV valve is partially closed at high vacuum when the engine idles and opens to allow maximum ventilation at low vacuum when the engine is producing power and the blow-by is at its maximum.
Your draft tube does the same thing. It produces a maximum draw when the car is moving and none when the car is stopped. A draft tube might be more dependable because it might be less likely to become blocked than would a PCV valve, but PCV valves are pretty dependable and are supposed to eliminate some pollution. I read where they were initially promoted as a way to get better gas mileage by burning otherwise "wasted" oil vapors.
The 260 had a draft tube and an optional PCV valve for California in 1962. They were evidently all given PCV valves by 1963 (see picture). That means that I could always retrofit my engine to a draft tube and eliminate the PCV valve if I ever really wanted too. The drawing shows that the 1962 260 also had a water-heated carburetor spacer that was eliminated on the 1963 version. I am guessing that it must have been a source of water leaks. Having a hot-water heated carburetor would have been nice in cold temperatures like what you might see in a Detroit or Montana winter, but it is not necessary for the little bit of "cold" weather that we get here in Tampa. :)
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