Road draft tube

[BrandonMag]

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.

I've got an RDT I had punkmechanic rig up when he installed my turbo. He drilled a hole in the timing gear access plate and welded an elbow to it. The 1 1/2 hose is routed straight up from the elbow and than back and to the passenger side, where it's hooked into the exhaust. I'll post up a picture tomorrow.

The downside to it is there's definitely a noticeable amount of vapor that emits from my tail pipe. I'm going to feel sorry for anyone who's on my passenger side with their window down this summer.

 

[mabc926]

Check this out: http://powerstrokenation.com/forums/showthread.php?t=62053&highlight=road+draft+tube

From what one of their members said, venting into the exhaust does pressurize the crankcase.

 

[RLDSL]

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...

Probably has a whole lot to do with the fact that most smaller tractor engines dont get above about 2400 rpm to reach the max high PTO output speed around 2100 for the low pto output speed, for the larger 4 and 6 cyl diesels they turn at even lower rpms and would require a smaller breather tube.

 

[mabc926]

Here's another way to do it:

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No oily mess under your truck, and no oily mess in your intake.

 

[towtruckdave]

I ran a road draft tube and I hate it.

It makes the whole area around your truck smell worse than a bums ass.

I am running it back into the intake asap.

 

[Dave7.3]

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.

Once again, heavy machinery does just fine without a vacuum being pulled on the system so I think a ford pickup will fair just fine. Sounds to me like there is more than just a vent problem causing your leaks.

Hate to sound like an ass, but those physics references couldn't be more different. In fact, not even remotely close.
What you are relying on is the venturi effect via exhaust gasses to draw out the crankcases gasses. Which works fine at low rpm, but some have reported that the velocity of the exhaust at higher rpm has indeed created crankcase pressure following right along with physics laws. And yes, even straight piped systems.

To prove this is actually a documented problem and not hearsay, click this link:
http://www.ford-trucks.com/forums/756250-ccv-mod-done-4.html#post7112430

For exact numbers to crunch check out this:
http://www.ford-trucks.com/forums/756250-ccv-mod-done-4.html#post7122368

Probably has a whole lot to do with the fact that most smaller tractor engines dont get above about 2400 rpm to reach the max high PTO output speed around 2100 for the low pto output speed, for the larger 4 and 6 cyl diesels they turn at even lower rpms and would require a smaller breather tube.

Huh, the JD5650 I drive in the summer at work is a pretty big tractor and has the same PTO rpm range as the 69' JD3020 I own. I do think it has a 3/4" RDT though to compensate for the larger size. As far as RPM differences, I think that is about the normal towing RPM for our trucks. I suppose if you are like Dyoung and operate at the 4200 range, the extra tube diameter would come in handy though.

 

[ken74amx]

I'm running a rdt on my truck and I hate it!!! After running the truck hard or towing for any time when I stop some where and idle for a bit it will smoke the neighborhood out! I will be plumbing mine with the cdr back into the intake very soon.

 

[greg_a_morton]

I have mine run strait into my intake tube with no cdr.

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[racer30]

Hey I know that fitting... nice looking engine greg-a-morton I will be painting mine Ford Blue also.

 

[greg_a_morton]

runs good! now if I could keep the rest of my truck together it would be nice!

 

[RLDSL]

Huh, the JD5650 I drive in the summer at work is a pretty big tractor and has the same PTO rpm range as the 69' JD3020 I own. I do think it has a 3/4" RDT though to compensate for the larger size. As far as RPM differences, I think that is about the normal towing RPM for our trucks. I suppose if you are like Dyoung and operate at the 4200 range, the extra tube diameter would come in handy though.

You dont have to be a speed freak to get up there in rpms dang close to that . The factory red line on these things is around 37-3800 rpms and a lot of folks who tow heavy use all of that, but I can't say that I've ever seen anyone ever bailing hay at that kind of engine speed ( well, maybe once on a corporate farm a family member was running thare was a fella had one screaming up around that high...right before he got fired He;d tweeked the pump so he could get done faster.

 

[Dave7.3]

I have mine run strait into my intake tube with no cdr.

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From what I have read, that is an even worse idea. The entire premise of the CDR is to not only support emissions by venting into the intake and remove the sight of the venting gas, but to keep the engine from pulling engine oil under hard acceleration. If you start pulling oil, that diesel will start burning it as fuel and you will have a runaway situation!

You dont have to be a speed freak to get up there in rpms dang close to that . The factory red line on these things is around 37-3800 rpms and a lot of folks who tow heavy use all of that, but I can't say that I've ever seen anyone ever bailing hay at that kind of engine speed ( well, maybe once on a corporate farm a family member was running thare was a fella had one screaming up around that high...right before he got fired He;d tweeked the pump so he could get done faster.

That would certainly be a sight to be seen...redline is 2800 on those I think?

 

[greg_a_morton]

I have tons of smoke or blow by out of the tube and looked like my truck was on fire every where I stopped(compression is around 400 on all cylinders). Since I have had this hooked up this way I have put around 500 miles on it and my dipstick has just come off the full mark. If you have a engine that has blow by like this and you restrict it with the cdr valve you will start blowing seals and gaskets. As for running off oil I am already at around 50% wmo for fuel. I ran another 6.9 like this for years with no issues also.

 

[Dave7.3]

I have tons of smoke or blow by out of the tube and looked like my truck was on fire every where I stopped(compression is around 400 on all cylinders). Since I have had this hooked up this way I have put around 500 miles on it and my dipstick has just come off the full mark. If you have a engine that has blow by like this and you restrict it with the cdr valve you will start blowing seals and gaskets. As for running off oil I am already at around 50% wmo for fuel. I ran another 6.9 like this for years with no issues also.

They don't seem to have a problem blowing seals and gaskets from the factory with these or any of the other turbo kits that reuse them... You would also think if they hurt performance, they would be the first thing to go when they designed aftermarket turbo kits too.

Since you seem to not know what a runaway is:
http://www.youtube.com/watch?v=mgPF0yJxWY0
(Same video, just full pull to remove any doubt):
http://www.youtube.com/watch?v=ZdalHWYtGRQ

BEWARE, really LOUD sound:
http://www.youtube.com/watch?v=5zx3qKX_Pno

 

[greg_a_morton]

all these instances are when a high pressure oil gets into the intake and acts like a injector in a way. With me running a 1" hose into intake there is no pressure and no residue in intake. On a truck equipped with a cdr there seems to always be quite a bit of oil in intake and pooling in the turbo.