Road draft tube connected to exhaust

[rodomotive]

I have seen and read a lot of info on the BARN about adding a PCV system to a Flathead but have not seen anything about connecting the end of the road draft tube to a bung in the exhaust pipe. This would pull way better at all speeds especially at idle, send the fumes to the rear of the car (instead of dumping them in front where they can enter the cab), would keep the underside of the vehicle cleaner and still look stock by retaining the tube. (As an added bonus it would lubricate the inside of the exhaust system extending its life from rusting out)
Who has done this and are the results as positive as I have described?

[ford38v8]

A better way to go would be to install a PCV valve and run the hose into the air cleaner.

[PeteVS]

Seems to me that the exhaust would be at a higher pressure than you'd find in the crankcase and that you'd only end up pumping exhaust into the crankcase. (IMHO)

[V12Bill]

I had a Lincoln V 12 that the bottom of the intake manifold was corroded away from the exhaust gases. The exhaust dumped into the valve valley and added preasure to the crankcase gases and blew oil past the slinger onto the clutch.

[rodomotive]

Come to think of it I have seen drag racers run hoses from valve covers to the headers and this can't be detrimental or it wouldn't be done. Maybe there is a one way valve in the system, does anyone know about that?

[andyleonard]

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You weld a threaded slash-cut tube into the collector and screw on a one-way valve with tubing to the valve cover. Standard issue circle track kit.

[Roger/Sacramento]

I like the idea and am considering doing same. Weld a fitting at an angle to the exhaust pipe and connect a hose to the PCV unit at the draft tube location. I don't like injecting dirty air into the intake at an isolated location. Adding MMO to the gas would provide uniform top cylinder lube.

[Hotrodster]

Drag racers get away with it because they only run 1/4 mile, I've seen it tried on street driven cars and it sucks all the oil right out of the engine. A friend tried it on a small block chevy and it sucked a quart of oil out about every 10 miles.

[Roger/Sacramento]

HOTRODSTER....I have a difficult time visualizing the exhaust having that much of a draw to pull oil from the valley up through the intake manifold opening and PCV.

[Ray With]

With a properly installed anti backfire valve (one way valve) they will work good any where and I had duals on my street car and had no oil loss problems. Mine ran from the front of the valve covers to the one way valve located in the collector part of the hedders.

[rodomotive]

Hey fellas, thanks for the replies but we're drifting of course just a bit as my initial question is about road draft tubes to exhaust not valve covers. Drawing oil up through the road draft tube problably isn't a concern and fumes backing up is eliminated with the one way valve.
There has to be someone in BARNland who has done this to a Flathead already.

[frenchy dehoux]

Here a picture of my down draft tube mounted on the side of my oil pan.

Frenchy

[Ray With]

Remove your down draft tube and install a plug in it and run a line from there to the exhause. Same thing as a valve cover. All down draft tubes drip a little oil so by removing it and install a PVC then run from there to the exhaust should work ok. They also make a PVC kit that connects the same way but goes to the carb vacc port via a hose.