What's in your intake?

[Agnem]

I bet yours doesn't look like this....

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Unless you run a road draft tube.

 

[hesutton]

Mine has the typical coat of oil residue from the old CDR "lubing" my intake for me.

Heath

 

[tractorman86]

i have a RDT but never cleaned it out when i did it so probably not.

 

[FordGuy100]

Yeah, mine just a little bit more oily than that ......well alot more oil residue than that

 

[funnyman06]

What is a road draft tube?

 

[FordGuy100]

What is a road draft tube?

A road draft tube replaces the CDR. The CDR lets the crankcase gases go into the intake to be burned. But a road draft tube just lets the crank case gases exit into the air. If you where to pull the air cleaner on a stock N/A IDI with a CDR, you would see how much oil is in the intake, its a good bit.

 

[funnyman06]

Do all of the trucks have CDR's I havent seen one on my truck?

 

[FordGuy100]

Do all of the trucks have CDR's I havent seen one on my truck?

Yup. On a N/A truck the CDR sites behind the intake towards the rear of the truck.

 

[69dieselfreak]

i have a RDT but never cleaned it out when i did it so probably not.

same here

 

[Agnem]

Actually you might be surprised. I never cleaned mine either. It just cleans itself thanks to a continuous diet of non-poluted air once you switch to the RDT.

 

[funnyman06]

so how does an RDT work? what do i have to do to convert it?

 

[RLDSL]

so how does an RDT work? what do i have to do to convert it?

It works on the same principal as blowing across the top of a beverage straw to draw the liquid up. Air crossing the top of a tube at a right angle creates a vacuum in the tube . If you eliminate the CDR and take the hose and run it straight down BELOW the lowest point on the truck where it remains in constant air flow while the truck is in motion, the air passing under the truck, will create a vacuum that will 'draw' , hence *road draft* the blowby crankcase gasses out of the crankcase. At idle, they will sit there and waft up around the cab , and if you spend a lot of time in city traffic, better lay in a supply of visene, because your eyes are going to take a beating.
All vehicles used to have this type of breather system, but they went to the closed crankcase systems to burn the blowby gasses to reduce emissions. The closed systems really do reduce emissions, and while many don't like maintaining the systems, the hydrocarbon vapours that are being recirculated into the intake, really are good fuel, so if you go RDT, that's free fuel that you are dumping on the ground. Just one other side of the coin. everything has it's trade offs.

 

[6.9poweredscout]

so agnem, what'd you do to convert yours to the RDT? i may wind up twin turboing the scout and i'll have to eliminate the CDR so better now then later. i even got the valley pan blockoff plug in the gasket kit.

-Jon

 

[discbrks]

Couldn't you hook up the RDT to the exhaust (past the Y pipe) and let the exhaust pull it out? Just like a crankcase evacuation system for a gasser.

 

[towcat]

Couldn't you hook up the RDT to the exhaust (past the Y pipe) and let the exhaust pull it out? Just like a crankcase evacuation system for a gasser.

you certainly can. a few guys are already doing that.