no.

The EGR is dumped into the intake manifold, well after the turbo.

the crank case ventilation is dumped in prior to the turbo.

 

Hi mate I thought the same as you And I have been running blocked egr and no catch can for a few months so far and hav not had any problem

 

Don't need it from the point of view that it is no longer mixing with the EGR soot making black goop..

Yes from the point of view that you do not want oil vapor / droplets going into the turbo which is spinning at up to 160,000rpm, it can damage the blades over time.

Also yes from the point of view that it will make the aftercooler less efficient (it will take longer to cool down if there is oil in it) which is probably another reason why the ricers run a catch can on their engines.

:cheers:

 

I would have thought that it might provide a good bit of lubrication to the intake side of the turbo and also the intake valves.

That's the stupidest think I've heard sorry, your diesel motor intake doesn't need lube and intake valves get the lube where it belongs via existing engine oil lubrication system.
The intake will still gunk up with the crap courtesy of the idiotic crankcase ventilation design by Nissan and the other vehicle manufacturers, diesel or petrol engines included! Either make it free to breathe or use catch can. Cheers

 

The intake will still gunk up with the crap courtesy of the idiotic crankcase ventilation design by Nissan and the other vehicle manufacturers, diesel or petrol engines included! Either make it free to breathe or use catch can. Cheers

Whats a better design? are you referring to the fitment of a catch can from the factory?

 

they would operate cleaner with a catchcan yes. cleaner the air intake the better.

 

just run the breather hose down and have it dump deside the chassie. it barely drops any oil, mainly mist .nearly all the trucks used this method until the euro 4 emmisions crap came out and there wasnt a problem with getting on the road , clearly im not a greenie! and im sure ill get a heap of people saying its not the right thing to do... meh

 

I am completely confused by the idea of why you would block off a pollution device that does not effect performance in any way

If you are recirculating unwanted by-products there is really something fundamentally wrong with your engine.

I understand budget concerns prohibit fixing the real issues like rings etc. but if you fix the underlying problems all works spectacularily :crazy:

 

I am completely confused.

Correct.

The engine has been designed to recirculate unwanted by-products,nothing fundamentally wrong there. yes it is a pollution device, and by removing it is wrong. (NoX generation)

Does it effect performance? yes as your diluting your intake charge with exhaust gasses.

 

I thought it is a 3 step motor which opens (or closes) in relation to the throttle position.

If Chaz reads this he will know. He did tell me but lack of sleep is affecting my memory.

 

"If you snap the throttle, the EGR system stops working as the cooler richer mixture reduces the NoX....."

No such thing as a "mixture" in a diesel.......
Fuel gets injected directly..
No such thing as "lean out" either...they are running very lean all the time.

EGR is introduced to reduce peak combustion temps and usually does not happen under high load conditions.
As for the catch can, if you're not in the habit of slightly overfilling, it is probably not necessary as there is already an oil separator built into the rocker cover.
You will find the under normal conditions very little oil accumulates in the catch can. Mine has been in for about 30,000 km and it would have about 4mm in the bottom of the can, hardly worth the effort.

 

No such thing as a "mixture" in a diesel.......
Fuel gets injected directly..

No such thing as "lean out" either...they are running very lean all the time.

Thats why there is fuel in the inlet manifold then :crazy:

 

normally, at full power EGR is off. however as its slow to turn off it can run at full noise. and more often than you would think, they stick open and run at full throttle with some very high EGT's.

 

Many thanks to whitie and tweak'e for your responses, that's the sort of info that I was after.


"That's the stupidest think I've heard sorry"

rumcajs; way to make a bloke feel comfortable about asking questions on this forum. Quite possibly the only think less educated than my grasp on the finer workings of a diesel engine's intake system is your grasp on the english language. Good work champ.

 

rumcajs; way to make a bloke feel comfortable about asking questions on this forum. Quite possibly the only think less educated than my grasp on the finer workings of a diesel engine's intake system is your grasp on the english language. Good work champ.

I'm sure you'll get over it, the same I got over my grasp of English, I'm sorry I was just brutally honest about what was the first thing that come to my mind. I know all too well there is no such thing as stupid question only the stupid answers. Cheers