Road draft tube

[Kevin 007]

Is there anybody using a road draft tube to replace the CDR to help prevent and possible head gasket issues due to all the cranksase gases getting vented into cylinders #7 & 8?

 

[jonathan]

i am. just a fyi people will look at you funny at red lights. i am liking about going back to the cdr instead of a rdt

 

[TWeatherford]

Plenty of guys do it. I have and I have a lot of oil leaks as a result of running a pressurized crankcase. I am planning on venting it into the exhaust, and get the exhaust to pull a bit of a vacuum on the crankcase. That way the nasty vapors will go in the exhaust, far away from my open window, and maybe get burnt up a little more. And with a slight vacuum in the crankcase, hopefully it won't leak so much oil.

If I didn't have a turbo I would just keep the CDR. Make sure the CDR is in good shape and clean, and run it. An engine can afford to swallow a few oil droplets, but not a turbine blade.

 

[idi traveler]

A cheap and easy solution to the cdr issue. I love mine, and nobody has said anything about my blow by.

 

[IDIDieselJohn]

Where do you guys dump that tube so it doesn't make a mess underneath the truck?

I know the Dodge Cummins have it dumped (from the factory) in front of the front axle.

 

[jonathan]

i havnt found spot i just clean the mess once a week lol

 

[RLDSL]

I am not a fan of road draft tubes, but if you are going to do it, do it right. Teh cdr holes weren't made for an open system, they were designed for a closed system and are too small for an open system . Go tiptoeing through a big truck boneyard and look at old rigs with road draft tubes and see the difference in teh size of teh breathers . Block off the CDR holes, make a much larger hole in a valve cover, you need at least an inch and a half for good breathing on an open system . You should be able to find parts at Summit racing to rig this up . Run the hose down to where it is hanging below EVERYTHING else under the truck, the purpose of a road draft tube is to make use of the ROAD DRAFT to draw the vapours out of the crankcase, if teh tube isn't hanging down in the airflow, the air can't blow across the end and draw out the gasses and you will get a buildup of pressure

 

[idi traveler]

That isn't a mess it's making under the truck, that's anti rust protection!

 

[jonathan]

That isn't a mess it's making under the truck, that's anti rust protection!

until your working on the truck and touch the mess and a pic of my rdt

 

[94f450sd]

i run a slobber tube on the stroke.used to get the smell in the cab till i used a longer hose so that it dumps under the bed.during the winter i get people telling me the bed is burning from the steam coming up between the cab and bed

 

[mabc926]

I don't like RDT's, I would rather have my engine burn the blow by than have it mucking up the underside of my truck.

 

[94f450sd]

build one of these http://www.guzzle7pt3.com/ccv.php

 

[Dave7.3]

Plenty of guys do it. I have and I have a lot of oil leaks as a result of running a pressurized crankcase. I am planning on venting it into the exhaust, and get the exhaust to pull a bit of a vacuum on the crankcase. That way the nasty vapors will go in the exhaust, far away from my open window, and maybe get burnt up a little more. And with a slight vacuum in the crankcase, hopefully it won't leak so much oil.

Are you sure you have a clear and open vent? When I had my truck parked I put some steel wool over my tube to keep mice out and forgot about it. Drove it to a friend's place a few weeks later and I noticed an oil pan leak I hadn't seen before. Took off the steel wool and it went away...
Oh and according to physics, running that into your exhaust is a bad idea when your exhaust pressure increases...

I am not a fan of road draft tubes, but if you are going to do it, do it right. Teh cdr holes weren't made for an open system, they were designed for a closed system and are too small for an open system . Go tiptoeing through a big truck boneyard and look at old rigs with road draft tubes and see the difference in teh size of teh breathers . Block off the CDR holes, make a much larger hole in a valve cover, you need at least an inch and a half for good breathing on an open system . You should be able to find parts at Summit racing to rig this up . Run the hose down to where it is hanging below EVERYTHING else under the truck, the purpose of a road draft tube is to make use of the ROAD DRAFT to draw the vapours out of the crankcase, if teh tube isn't hanging down in the airflow, the air can't blow across the end and draw out the gasses and you will get a buildup of pressure

That is odd...all of our farm machinery (4cyl and 6cyl diesels) have a single half inch road draft tube. Really think its gonna need one and a half inches to cover 2 extra cylinders? Not doubting the road draft effect on big rigs...but explain how that works on a tractor that moves along at under 1mph baling hay for hours on end...

This thread sounds familiar...

 

[TWeatherford]

Are you sure you have a clear and open vent? When I had my truck parked I put some steel wool over my tube to keep mice out and forgot about it. Drove it to a friend's place a few weeks later and I noticed an oil pan leak I hadn't seen before. Took off the steel wool and it went away...
Oh and according to physics, running that into your exhaust is a bad idea when your exhaust pressure increases...

This thread sounds familiar...

Yes, I am quite sure it is clear and open. It is about a 4 foot long tube, 1 inch ID, no kinks or blockages (I have checked). I do think that for a RDT to work without something pulling a vacuum on it, its gonna have to be seriously huge.

According to the laws of physics, I can create a vacuum using exhaust gases. Ever seen an airplane fly? Same basic principle. Velocity on top of the wing is higher, therefore pressure is decreased. When you have a pressure difference, you get lift, or suction (same thing). True, if my exhaust were highly pressurized I wouldn't get a pressure lower than atmospheric, but since we have no CAT and I plan to run without a muffler, I am unsure how it will become pressurized (I will have a check valve in case a squirrel decides to crawl up the exhaust and suffocates himself, though it would still have to be a really fat squirrel).

Yes this thread does sound familiar.

 

[94f450sd]

some interesting reading: http://www.ford-trucks.com/forums/756250-ccv-mod-done-4.html#post7112483