FOUND: Solution That Stops Oil from Being Sucked into the Intake Manifold
10-16-2007, 05:09 PM
#21
Racer
Member Since: Dec 2005
Location: North Las Vegas Nevada
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I have a glass filter, with breather element inside, in the line to the TB. It NEVER gets anything at all.
I DO have 2 catch cans, but they are in the SAME (PCV) line. The second can is to catch whatever gets past the first one. I also have the same type of glass filter W/element in THAT line as well........last & close to the PCV port. I use this as an indicator. When I see the white element getting some oil, I know it is time to empty them. I have also located my cans in areas to keep them as cool as possible. Hot oil is thinner & will get sucked out of your can much more easily.
I am keeping the oil to the intake to a minimum anyway
sorry for the ramblin on............
Rob
I DO have 2 catch cans, but they are in the SAME (PCV) line. The second can is to catch whatever gets past the first one. I also have the same type of glass filter W/element in THAT line as well........last & close to the PCV port. I use this as an indicator. When I see the white element getting some oil, I know it is time to empty them. I have also located my cans in areas to keep them as cool as possible. Hot oil is thinner & will get sucked out of your can much more easily.
I am keeping the oil to the intake to a minimum anyway
sorry for the ramblin on............
Rob
10-17-2007, 10:34 AM
#24
I suppose anyone! 
A breather on the valvecover introduces a vacuum leak through the crankcase and then the PCV valve.
The way the second can is hooked up should introduce either a vacuum leak (if the throttle body connection is after the blade) or unmetered air (if it's before the throttle blade).
A breather on the valvecover introduces a vacuum leak through the crankcase and then the PCV valve.
The way the second can is hooked up should introduce either a vacuum leak (if the throttle body connection is after the blade) or unmetered air (if it's before the throttle blade).
10-17-2007, 11:09 AM
#25
Melting Slicks
I suppose anyone!
A breather on the valvecover introduces a vacuum leak through the crankcase and then the PCV valve.
The way the second can is hooked up should introduce either a vacuum leak (if the throttle body connection is after the blade) or unmetered air (if it's before the throttle blade).
A breather on the valvecover introduces a vacuum leak through the crankcase and then the PCV valve.
The way the second can is hooked up should introduce either a vacuum leak (if the throttle body connection is after the blade) or unmetered air (if it's before the throttle blade).
But, a second can would NOT cause a vacuum leak, if it's simply stuck into the closed circuit, as these two gentleman above have done.
10-17-2007, 03:34 PM
#26
Race Director
Thanks for sharing your setup. Not sure I'll need it but if I ever do...
Great work.
Great work.
10-17-2007, 06:36 PM
#27
Le Mans Master
Yes, I had two variables in this latest track day to analyze.
I had run the car with a the breather cap, a single catch can on the PCV system hose and a Supporting Vendor had plumbed the hose from the rocker cover over the radiator to the front edge of the air bridge, just upstream of the MAF.
That setup pumped the MAF and the VaraRam air filter full of oil, and the single AMW catch can would also have 1.5 to 2.0 inches of oil in it after one day of HPDE laps.
So, I decided to install the Smith Brother oil flow retricting pushrods. In addition, I had noted where several Forum members had added a second catch can. Another Forum member had installed a second catch can at the end of the rocker cover hose and bolted the can low on the passenber-side frame rail without connecting it back to the throttle body. He had also installed the oil flow restricting pushrods. This member stated that he still filled the catch can on the frame rail with oil every track day. The other individuals stated that they were getting oil in both catch cans after every track day.
I decided to see if the pushrods, in addition to a second catch can mounted so that it's inlet was higher than the outlet of the rocker arm cover hose would stop the oil flow to the throttle body.
It did. The combination of components also reduced the oil flowing into the PCV line catch can by over 90%.
I am going to put the standard rocker arm cover oil fill cap back on the passenger-side valve cover and see if the system still keeps the throttle body dry.
I had run the car with a the breather cap, a single catch can on the PCV system hose and a Supporting Vendor had plumbed the hose from the rocker cover over the radiator to the front edge of the air bridge, just upstream of the MAF.
That setup pumped the MAF and the VaraRam air filter full of oil, and the single AMW catch can would also have 1.5 to 2.0 inches of oil in it after one day of HPDE laps.
So, I decided to install the Smith Brother oil flow retricting pushrods. In addition, I had noted where several Forum members had added a second catch can. Another Forum member had installed a second catch can at the end of the rocker cover hose and bolted the can low on the passenber-side frame rail without connecting it back to the throttle body. He had also installed the oil flow restricting pushrods. This member stated that he still filled the catch can on the frame rail with oil every track day. The other individuals stated that they were getting oil in both catch cans after every track day.
I decided to see if the pushrods, in addition to a second catch can mounted so that it's inlet was higher than the outlet of the rocker arm cover hose would stop the oil flow to the throttle body.
It did. The combination of components also reduced the oil flowing into the PCV line catch can by over 90%.
I am going to put the standard rocker arm cover oil fill cap back on the passenger-side valve cover and see if the system still keeps the throttle body dry.
10-17-2007, 07:04 PM
#29
Melting Slicks
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Based on the evidence gathered by the C6.R Race Team, Wheel to Wheel, and DJ Racing, this are no adverse effects to this change.
The GM engineers provided an excessive amount of oil. By using the Smith Brothers pushrods, you are reducing the oil to a normal amount.
10-18-2007, 02:35 PM
#31
Le Mans Master
