RDT into exhaust

[typ4]

What we have done on some vw engines is to put a tube in the exhaust and hold the rpms at cruise and move the tube in and out till you feel some suction and then weld it there, maybe that could be tried???

 

[Ironman03R]

Got my truck back together, I dont notice much more whistle with the RDT in the exhaust.
Anyway... I did this really easy. I bought a 16AN hose off Ebay from a seller selling old Nascar parts. The AN fitting threads right on a 1" pipe nipple welded in the exhaust @45. Then I cut off the other end and slipped it over the tube on the CDR on the valvecover clamped it w/ a hose clamp.
At idle w/ the oil cap off theres some blowby coming out but when I hold the rpm's up it all gets sucked in. Just dont look down the hole when you rev it up unless you like oil splatter!(dont asks)

 

[Ironman03R]

Heres a pic.

 

[towcat]

I can't remember if I've asked this before or not (my memory's about fried), but do you by chance have a part number for the check valve that you used? Did it thread directly onto the venturi fitting, or did you have to adapt it?

Thanks! I really need to get my exhaust hooked up...

speaking of which.......
you've really passed the 30 day abandonment rule
I'm about to invoke salvage rights on that pipe and parts you've left behind

 

[The Warden]

speaking of which.......
you've really passed the 30 day abandonment rule
I'm about to invoke salvage rights on that pipe and parts you've left behind

Actually, unless something changes, I'll be in San Jose tomorrow evening...going to something at SJSU. I can give you a call after I'm done and see where you're at, if you'd like...

OTOH, I know how tempting that exhaust piece is

 

[tractorman86]

it really is pretty simple i'll do it with a vented valve cover.

 

[Agnem]

So Ron, how come you closed it up? I'll be interested to see how both of these systems work long term.

 

[Dsl_Dog_Treat]

So Ron, how come you closed it up? I'll be interested to see how both of these systems work long term.

I was getting just enough blowby at an idle that was still ******* the gals off at the drivethru windows.
For some reason at the perscribed angle and depth, it wouldn't draw at an idle.
Maybe I ought to run a compression check on the cylinders to see what type of numbers I'm getting.

 

[Agnem]

That's surprising. Maybe the vortical tube wasn't long enough.

 

[Dsl_Dog_Treat]

Yeah it has me baffled pretty good. I wouldn't think the diesel apps would be any different than the gassers. Exhaust is exhaust.
Scott sent me the installation diagram and I put it in to specs.

What I'm wondering is if I have some developing blowby that is putting enough of a positive pressure on the system it would be just like an old worn out N/A motor with healthy blowby.

I plan on digging into it further once I get this Chevy 6.2 project wrapped up and some space freeded up in the shop.

 

[6 Nebraska IDIs]

Alright guys, I am wanting to do this to my brown truck while I have everything apart and Im installing a new 4" exhaust at the same time so I really need to figure out what to do.
Should I just remove the CDR all together, and plumb the RDT straight from the valve cover to the exhaust? Or if you use the CDR does it not require a check valve?
I want to do this right, as Im pulling the engine and its going to have all new seals and such in it and I dont want to blow anything out.

 

[sle2115]

Yeah it has me baffled pretty good. I wouldn't think the diesel apps would be any different than the gassers. Exhaust is exhaust.
Scott sent me the installation diagram and I put it in to specs.

What I'm wondering is if I have some developing blowby that is putting enough of a positive pressure on the system it would be just like an old worn out N/A motor with healthy blowby.

I plan on digging into it further once I get this Chevy 6.2 project wrapped up and some space freeded up in the shop.

What size exhaust are you running? We had low suction on our system when plumbed into open headers (had a gauge to meaure it) and noticed low to no suction at idle. Large exhaust would have less volume flowing in low flow circumstances (idle for instance) so it might be the problem. I'm thinking you are running 4 inch exhaust, but I sometimes don't think so well!

 

[Agnem]

I'd get the dog catcher to comment on this one. He's got more experience with it than anyone else at this point, having tried it a couple differnent ways.

 

[sle2115]

I'd get the dog catcher to comment on this one. He's got more experience with it than anyone else at this point, having tried it a couple differnent ways.

Yep, I have installed probably 20 or more of these systems, but 0 in diesel. After the weather breaks, that won't be the case though. I'm still going double valve cover and double evac.

 

[Cheaper Jeeper]

I guess I can see where this it better than having the blowby go through your turbo, but other than that, what's the advantage?

If you're putting all of the oil into your exhaust its still going to make smoke at the tailpipe, isn't it? In fact, I'd think it would smoke even worse since you won't even be extracting any of the BTUs out of it through combustion.

So you end up with as much or more smoke, but no benefit of any of the oil being burned to fuel engine and create power.

Personally I wouldn't care much about using a quart of oil every few hundred miles, or even about a little extra smoke at the tailpipe - IF the oil wasn't going through turbo and possibly gumming it up AND if the oil were getting evenly distributed to all 8 cylinders - instead of such a large percentage of it going only to the back two cylinders, and possibly damaging fire rings and weakening head gaskets.

Am I missing something here?