Installed the Powell Air/Oil Separator today
Moderator
08-04-2015, 04:17 PM
#31
Senior Member
iTrader: (13)
heres a link from powell. this thing does work. to be honest if you know the products that john sells and makes they are nothing but the best.
https://www.cobaltss.net/forums/2-0l...system-289225/
https://www.cobaltss.net/forums/2-0l...system-289225/
08-04-2015, 05:50 PM
#35
Senior Member
iTrader: (6)
Installed the Powell Air/Oil Separator today
Given the amount of oil the filter collects and returns to the dipstick it does work. Iirc he has an update that will help make them work even better since it removes the pcv in the intake mani
09-02-2015, 01:53 PM
#43
This only serves to improve upon the factory pcv system for cars running more than the stock 15psi & aftermarket tunes...
the instructions with the kit are comprehensive; it is essential that you either have clean valves or get them cleaned. This kit does not clean valves it prevents the continued deposition of oil on the intake valves. So far we have learned quite a bit about this coking issue. While DI valve coking is not unique to the LNF engine, its clear that bisecting the main vent line and inserting a drain back seperator does an effective job in the primary source of oil in the inlet tract.
The inlet manifold pcv valve can be defective, and I have found it so in quite a few de coke jobs on LNF I have done. If the IM pcv valve is reluctant to close until high boost levels hit it, or doesnt close at all, the build up becomes severe and the car really runs badly.
Sometimes I have encountered LNF with issues that the PCV upgrade evidentally could not deal with. Generally that has been cracked piston ring lands, damaged rings, or even broken charge pipes.
If the engine health is good, its reasonable to expect the upgrade will keep your engine running well.
The inlet manifold pcv valve can be defective, and I have found it so in quite a few de coke jobs on LNF I have done. If the IM pcv valve is reluctant to close until high boost levels hit it, or doesnt close at all, the build up becomes severe and the car really runs badly.
Sometimes I have encountered LNF with issues that the PCV upgrade evidentally could not deal with. Generally that has been cracked piston ring lands, damaged rings, or even broken charge pipes.
If the engine health is good, its reasonable to expect the upgrade will keep your engine running well.
sinister did not know what the manifold looks like. There appears to be a lot of confusion about the PCV system and lots of opinions about it, many of them are wrong.
FOR THE RECORD.
There are two check valves in an LNF One is the FRESH AIR INLET (FAI) it lets metered air in from the inlet tube post MAF to the rocker cover port in the middle of the back of the rocker cover. There is a 4 mm orifice in this FAI tube. There is an UPDATED tube and valve as the nipple in the stock inlet tube can break from excessive pressure.
The other is the PCV VALVE ( dirty side) located in the inlet manifold as sox fan has show, that vents blow by gasses into the inlet manfold OFF BOOST.
The rocker cover port at the passenger side (front ) of the engine is routed stock to the turbo inlet port. It vents blow by gasses to the inlet side. As oil builds up combined with the blow by gasses running through the mezanine along the rocker cover to this port, it actually can drain out directly to the turbo inlet.
It is this issue that the Powell PCV upgrade oil seperator deals with, and drains excess oil seperated back to the engine.
As the engine tilts under accelleration or in cornering this issue with oil draining into the turbo inlet gets worse, which is why Wangspeed found he can collect as much as 500 cc of oil in 20 laps on track with the car, but collects less than that over a month of street driving.
The upgrade works.
The understanding of how it works, appears to be (how can I say this politely?) VARIABLE on here. There is a delicate balance of vacuum and the PCV orifices and paths of least resistance for blow by gasses to vent. The PCV upgrade really does a good job. The latest change as of July 1 to the system makes it easier for folks to plumb without issues; the next big change will be a full time vacuum pump but thats not needed for anything other than the extreme track guys imho....any parts of the PCV system not in good order like the FAI or the IM PCV valve will give issues, as will any leaks especially at the MAP sensors for example. Hope this helps
FOR THE RECORD.
There are two check valves in an LNF One is the FRESH AIR INLET (FAI) it lets metered air in from the inlet tube post MAF to the rocker cover port in the middle of the back of the rocker cover. There is a 4 mm orifice in this FAI tube. There is an UPDATED tube and valve as the nipple in the stock inlet tube can break from excessive pressure.
The other is the PCV VALVE ( dirty side) located in the inlet manifold as sox fan has show, that vents blow by gasses into the inlet manfold OFF BOOST.
The rocker cover port at the passenger side (front ) of the engine is routed stock to the turbo inlet port. It vents blow by gasses to the inlet side. As oil builds up combined with the blow by gasses running through the mezanine along the rocker cover to this port, it actually can drain out directly to the turbo inlet.
It is this issue that the Powell PCV upgrade oil seperator deals with, and drains excess oil seperated back to the engine.
As the engine tilts under accelleration or in cornering this issue with oil draining into the turbo inlet gets worse, which is why Wangspeed found he can collect as much as 500 cc of oil in 20 laps on track with the car, but collects less than that over a month of street driving.
The upgrade works.
The understanding of how it works, appears to be (how can I say this politely?) VARIABLE on here. There is a delicate balance of vacuum and the PCV orifices and paths of least resistance for blow by gasses to vent. The PCV upgrade really does a good job. The latest change as of July 1 to the system makes it easier for folks to plumb without issues; the next big change will be a full time vacuum pump but thats not needed for anything other than the extreme track guys imho....any parts of the PCV system not in good order like the FAI or the IM PCV valve will give issues, as will any leaks especially at the MAP sensors for example. Hope this helps
I saw no post (did I miss it?) where John seemed to imply the complete removal of the IM mounted pcv valve, and I was not told of any optional setup which eliminated the IM pcv valve;
IMHO, retaining it, as another safety precaution might be the prudent move...
09-02-2015, 02:05 PM
#44
Senior Member
iTrader: (6)
gains?
This only serves to improve upon the factory pcv system for cars running more than the stock 15psi & aftermarket tunes...
(and more)
When I ordered my kit, I was told that essentially each kit is custom made in accordance to the parts that are on the car.
I saw no post (did I miss it?) where John seemed to imply the complete removal of the IM mounted pcv valve, and I was not told of any optional setup which eliminated the IM pcv valve;
IMHO, retaining it, as another safety precaution might be the prudent move...
This only serves to improve upon the factory pcv system for cars running more than the stock 15psi & aftermarket tunes...
(and more)
When I ordered my kit, I was told that essentially each kit is custom made in accordance to the parts that are on the car.
I saw no post (did I miss it?) where John seemed to imply the complete removal of the IM mounted pcv valve, and I was not told of any optional setup which eliminated the IM pcv valve;
IMHO, retaining it, as another safety precaution might be the prudent move...
His newest prototype (at least of last mention it still was in the development stage) does remove the IM pcv iirc
09-02-2015, 02:25 PM
#45
gains?
This only serves to improve upon the factory pcv system for cars running more than the stock 15psi & aftermarket tunes...
(and more)
When I ordered my kit, I was told that essentially each kit is custom made in accordance to the parts that are on the car.
I saw no post (did I miss it?) where John seemed to imply the complete removal of the IM mounted pcv valve, and I was not told of any optional setup which eliminated the IM pcv valve;
IMHO, retaining it, as another safety precaution might be the prudent move...
This only serves to improve upon the factory pcv system for cars running more than the stock 15psi & aftermarket tunes...
(and more)
When I ordered my kit, I was told that essentially each kit is custom made in accordance to the parts that are on the car.
I saw no post (did I miss it?) where John seemed to imply the complete removal of the IM mounted pcv valve, and I was not told of any optional setup which eliminated the IM pcv valve;
IMHO, retaining it, as another safety precaution might be the prudent move...
Depending on how the car is running, the IM PCV is definitely a source of oil in the IM. When I was troubleshooting an apparent vacuum and bogging issue when I replaced my engine I found fresh oil on the IM side of the throttle plate after few miles of running. The only way I could see that getting there was through the IM PCV. That lead me down a rabbit hole of trying to diagnose the PCV system. The problem ended up being entirely different, BTW.
11-27-2016, 08:51 AM
#50
Junior Member
Thread Starter
