CDR scavenging?

[pacificdrumma]

Has anyone ever hooked up the "output" of the CDR to a port in the down pipe or other section of the exhaust? I currently run a dripper tube down to the ground because I don't like the idea of dirty, oily air going back thru the turbo and engine. Would connecting the CDR to a vacuum-like type of force draw out more pressure and help the engine at all? Or would it be a waste of time?

 

[JayTheCPA]

Was the installation of a catch can ruled out?

 

[schiker]

I don't see it as an advantage to pull a vacuum on the crankcase as the turbo provides positive pressure to the intake. I think - guess gas engines that run vacuum pumps are to help the intake stroke improve vacuum on the intake valve and allow more air in maybe helps keep the rings a little more sealed on the intake stroke especially across TDC ?????

Oil does burn so it is a tad of BTU's in a healthy engine I don't think it hurts our engines. I think it would be worse for a truck with intercooler that the gas can condense and oil can settle in the cooler.

 

[pacificdrumma]

Was the installation of a catch can ruled out?

By catch can, I assume you mean a container to collect the "stuff" coming out of the dripper tube? If so, that is not my concern. The engine has a little blow by, but nothing crazy. I am more thinking towards drawing the air out, and therefore assisting the CDR.

 

[JayTheCPA]

Search / Google on "oil catch can" for illustrations / examples of how the system works with the crankcase vent and intake systems. Of the few catch can installations in the 6.5 that I had seen, ProVent and Mishimoto were the more common ones.

 

[WarWagon]

It would probably take more power run a pump than it would give you in fuel savings. A slight vacuum will help stop oil leaks, but, wants to pull dirt in through the same leaks. Pressure will help oil leaks become worse. The CDR is an attempt to keep the vacuum under control so the engine oil consumption is not as bad along with other things - just the air filter alone is too much vacuum with good rings.

The downpipe has pressure due to the muffler, cat, and total length of exhaust pipe.

The CRD routed to the intake lets the engine burn a lot of the 'mess'. We don't have an intercooler and I don't have EGR. The oil that does go through the CDR helps keep the intake clean on the inside. As for the outside... No.

Some of the modern diesel oil stinks in use due to additives to meet the newest requirements. So a intake CDR system has a odor control advantage. My trucks smell bad enough without additional help from more odor sources under the hood.

 

[pacificdrumma]

I was worried about that- the additional vacuum on the CDR might draw out TOO much from the engine. I guess Ill just keep with my drip tube.

 

[Big T]

My son's '94 has quite a bit of blowby and consumes at least a quart of oil every 1,000 miles. Otherwise, it runs great and with 255K miles, shows no sign of giving up. With dino oil at $3 per quart, we figure $300+ additional cost over the next 100K miles. That is not worth making any changes to avoid. We'll consider gapless rings on the back up engine from the '95 wreck as the engine will be out of the truck waiting for it's next ride.