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Okay, so 3 fluid oz. is equivalent to 18 tsp. in 8,000 miles, or 1.8 tsp. per 800 miles, or .18 tsp. per 80 miles. Take a 1/4 tsp. (.25) measuring spoon from the kitchen, and imagine a bit less than that (.18) of oil going into your intake system to be burned, spread out over 80 miles.
So 18 drops is being burned per 80 miles. That would be about .22 drops per mile, round that to 1/4 drop of oil per mile, divided into 8 cylinders, so if my math is right we end up with .03 drops per cylinder per mile.
Funny part, the Mazda rotary motors burns more oil per design, and is not a problem either.
Fact it, since the rotary motors do burn oil by design, Mazda tried to change to thicker oil in the RX8 motors so it burnt less oil to be more emission friendly, and this ended up with the motors have a very short lives isntead.
FYI, but you have a dirty side, and clean side to the PVC system, so if you are trying to trap all the oil (isntead of the cylinders burning the oil instead), then you need get a second can on the clean side of the PCV system as well.
Hence the clean side is the port off the valve cover, and which is piped in front of the TB.
The clean side pulls the vapors out of the motor during WOT, and dumped into the intake in front of the TB during WOT instead.
Dirty side is just the intake manifold port and the valley cover port, and which the motor uses when your not at WOT to pull the vapors out of the motor.
As for why it called the dirty side, the motor spends most of it's time with a vacuum on the intake manifold, and this is used the most by the motor to draw the vapors out. When at WOT, the intake manifold vacuum itself drops to zero vacuum, and the air filter flex hose in front of the TB has a vacuum that the PCV uses instead.
Just to add: That vacuum in front of the TB helps scavenge blow-by out of the engine vs having a breather cap on top of a valve cover. This is especially important with boosted applications. It's the same principle as using headers to scavenge more exhaust out of the cylinders.
Last edited by Mike's LS3; 09-06-2018 at 12:17 PM.
This is especially important with boosted applications.
Boost really changes the PCV system rules, since under boost, you have a one way valve on the intake manifold port to keep the boost from blowing out that normal suction port as the intake manifold gets pressurized, plus dealing with the extra blow by past the pistons from the boost that is venting out of the motor as well. Hence during boost, your dirty side of the PCV system is shut down from working, and everything including the blow by pressure in the block is channeled through the clean side of the PCV system isntead.
With less the a few hundred miles the intakemanifold is all wet with what looks like oil ??
Just about every lsx engine even the 00 era trucks get some..clean it out it just gets an oily film, doesnt hurt anything. It wont "pool up" and hurt anything
Every motor has some blowby. Mine was an oil burner from day 1 but hasnt gotten noticably worse over time.
Are you looking at the refraction of the pyrex measuring cup and thinking that it is a layer of water under the oil? It's not.
No. And I'm not looking at the reflection, either. I was being facetious. I'm thinking most of the "water" cooks off in the hot can, ergo it will take a seriously plunging thermometer to freeze the oil. Not that at, say, 50° below, the oil won't be thick. It certainly will. But not frozen.
Okay, so 3 fluid oz. is equivalent to 18 tsp. in 8,000 miles, or 1.8 tsp. per 800 miles, or .18 tsp. per 80 miles. Take a 1/4 tsp. (.25) measuring spoon from the kitchen, and imagine a bit less than that (.18) of oil going into your intake system to be burned, spread out over 80 miles.
So 18 drops is being burned per 80 miles. That would be about .22 drops per mile, round that to 1/4 drop of oil per mile, divided into 8 cylinders, so if my math is right we end up with .03 drops per cylinder per mile.
Yes it does matter. This oil doesn't necessarily all burn. Most of it accumulates on the backs of the intake valves and kills power. Direct injection engines are even more susceptible to this problem. As a matter of fact GM is now putting catch cans on non dry sump engines in Camaros and other cars. Notice on the cutaway engine behind the water pump is a black plastic tank. Follow the drain tubing all the way back to the oil pan.
Yes it does matter. This oil doesn't necessarily all burn. Most of it accumulates on the backs of the intake valves and kills power. Direct injection engines are even more susceptible to this problem. As a matter of fact GM is now putting catch cans on non dry sump engines in Camaros and other cars. Notice on the cutaway engine behind the water pump is a black plastic tank. Follow the drain tubing all the way back to the oil pan.
This is ridiculous. 30 years ago I worked on motors every day and I never remember seeing anything like this . I thought they figured out the PCV system a long time ago . I have to attribute my rough idle to this condition ? What would you say ??
This is ridiculous. 30 years ago I worked on motors every day and I never remember seeing anything like this . I thought they figured out the PCV system a long time ago . I have to attribute my rough idle to this condition ? What would you say ??
Ok, Mr Wizard, riddle me this:
In a container pour in one inch of water. Next pour in one inch of oil. The oil will float. Then pour in ten inches of oil. Where will the water be?
Ok, Mr Wizard, riddle me this:
In a container pour in one inch of water. Next pour in one inch of oil. The oil will float. Then pour in ten inches of oil. Where will the water be?
09-06-2018, 10:34 AM
