Catch me if you can!
Catch me if you can!
07-06-2018, 02:09 AM
Compare the PCV system on the -GE and the -GTE. The PCV on the -GE works as you've described: the intake PCV does have a 1-way valve in it (where the hose connects to the cam cover), the exhaust one attaches to the intake hose. The -GTE's intake PCV is the same, which is fine because of the 1-way valve. The -GTE's exhaust PCV goes into the intake piping BEFORE the turbos.
So, a stock -GE will never see pressure down either of its PCV hoses, because an N/A engine's intake only ever runs at a vacuum. A stock -GTE will never see pressure down either of its PCV hoses. Yours will.
Edited 19-07-2011, 11:46 AM by toxo.
In theory yes because you've enlarged your pressure vessel, however you aren't replicating the OEM setup as your setup includes a supercharger.
Compare the PCV system on the -GE and the -GTE. The PCV on the -GE works as you've described: the intake PCV does have a 1-way valve in it (where the hose connects to the cam cover), the exhaust one attaches to the intake hose. The -GTE's intake PCV is the same, which is fine because of the 1-way valve. The -GTE's exhaust PCV goes into the intake piping BEFORE the turbos.
So, a stock -GE will never see pressure down either of its PCV hoses, because an N/A engine's intake only ever runs at a vacuum. A stock -GTE will never see pressure down either of its PCV hoses. Yours will.
07-06-2018, 02:26 AM
toxo So, a stock -GE will never see pressure down either of its PCV hoses, because an N/A engine's intake only ever runs at a vacuum. A stock -GTE will never see pressure down either of its PCV hoses. Yours will.
Would a -GTE not see pressure down its intake-side PCV hose though.? Granted the valve on the PCV would stop any pressure entering the crankcase, but if you were to slice that hose in half for example and then extend both ends with 1.5m of tubing so you could put a catch can in the middle at some random location in the engine bay, you'd still be pressurising that hose and the can wouldn't you?
I suppose this is a good reason for running a catch can with one side connected to the PCV, but the other side simply venting to atmosphere rather than running another line back.
But for some reason it was recommended that I keep the 'loop' intact on the IS300, so the blow-by gasses are recirculated, but the oil vapor contained within them is filtered out by the can.
All makes for interesting learning
toxo So, a stock -GE will never see pressure down either of its PCV hoses, because an N/A engine's intake only ever runs at a vacuum. A stock -GTE will never see pressure down either of its PCV hoses. Yours will.
Would a -GTE not see pressure down its intake-side PCV hose though.? Granted the valve on the PCV would stop any pressure entering the crankcase, but if you were to slice that hose in half for example and then extend both ends with 1.5m of tubing so you could put a catch can in the middle at some random location in the engine bay, you'd still be pressurising that hose and the can wouldn't you?
I suppose this is a good reason for running a catch can with one side connected to the PCV, but the other side simply venting to atmosphere rather than running another line back.
But for some reason it was recommended that I keep the 'loop' intact on the IS300, so the blow-by gasses are recirculated, but the oil vapor contained within them is filtered out by the can.
All makes for interesting learning
07-06-2018, 02:31 AM
jimxms I suppose this is a good reason for running a catch can with one side connected to the PCV, but the other side simply venting to atmosphere rather than running another line back.
This is how I planned on running it on mine.
jimxms But for some reason it was recommended that I keep the 'loop' intact on the IS300, so the blow-by gasses are recirculated, but the oil vapor contained within them is filtered out by the can.
All makes for interesting learning
I too have read this someone, and it's specific to differences between the 200 and the 300.
![[Image: tempsig2.jpg]](http://i121.photobucket.com/albums/o227/84stoney/tempsig2.jpg)
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:jimxms I suppose this is a good reason for running a catch can with one side connected to the PCV, but the other side simply venting to atmosphere rather than running another line back.
This is how I planned on running it on mine.
jimxms But for some reason it was recommended that I keep the 'loop' intact on the IS300, so the blow-by gasses are recirculated, but the oil vapor contained within them is filtered out by the can.
All makes for interesting learning
I too have read this someone, and it's specific to differences between the 200 and the 300.
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:
07-06-2018, 02:35 AM
jimxms Would a -GTE not see pressure down its intake-side PCV hose though.? Granted the valve on the PCV would stop any pressure entering the crankcase, but if you were to slice that hose in half for example and then extend both ends with 1.5m of tubing so you could put a catch can in the middle at some random location in the engine bay, you'd still be pressurising that hose and the can wouldn't you?
Yes sorry I could have worded that better. The hose would have pressure in it, but that pressurised air would never enter the crankcase (or even the cam cover).
jimxms I suppose this is a good reason for running a catch can with one side connected to the PCV, but the other side simply venting to atmosphere rather than running another line back.
But for some reason it was recommended that I keep the 'loop' intact on the IS300, so the blow-by gasses are recirculated, but the oil vapor contained within them is filtered out by the can.
All makes for interesting learning
I have no idea why you would be recommended to do that. I'd love to know why
On N/A cars there is an argument that the intake vacuum actively draws the oil vapour out of the crank case, so you should stay connected to the intake. But you hardly ever see crank case pressure on an N/A, and with F/I any blowby would be in a large enough quantity to draw itself out.
Edited 19-07-2011, 12:09 PM by toxo.
jimxms Would a -GTE not see pressure down its intake-side PCV hose though.? Granted the valve on the PCV would stop any pressure entering the crankcase, but if you were to slice that hose in half for example and then extend both ends with 1.5m of tubing so you could put a catch can in the middle at some random location in the engine bay, you'd still be pressurising that hose and the can wouldn't you?
Yes sorry I could have worded that better. The hose would have pressure in it, but that pressurised air would never enter the crankcase (or even the cam cover).
jimxms I suppose this is a good reason for running a catch can with one side connected to the PCV, but the other side simply venting to atmosphere rather than running another line back.
But for some reason it was recommended that I keep the 'loop' intact on the IS300, so the blow-by gasses are recirculated, but the oil vapor contained within them is filtered out by the can.
All makes for interesting learning
I have no idea why you would be recommended to do that. I'd love to know why
On N/A cars there is an argument that the intake vacuum actively draws the oil vapour out of the crank case, so you should stay connected to the intake. But you hardly ever see crank case pressure on an N/A, and with F/I any blowby would be in a large enough quantity to draw itself out.
07-06-2018, 02:37 AM
Stoney I too have read this someone, and it's specific to differences between the 200 and the 300.
Toxo can probably confirm or deny this, but would it be possible that the blow-by on the intake side pcv could be positive 'boost' pressure? Or is blow-by something that happens after combustion so it wouldn't be?
Thats the only reason I could think to recirculate whatever comes out of that valve (minus the crud)?
Stoney I too have read this someone, and it's specific to differences between the 200 and the 300.
Toxo can probably confirm or deny this, but would it be possible that the blow-by on the intake side pcv could be positive 'boost' pressure? Or is blow-by something that happens after combustion so it wouldn't be?
Thats the only reason I could think to recirculate whatever comes out of that valve (minus the crud)?
07-06-2018, 02:53 AM
jae 2010 best lexus category show and shine winner
jae 2010 ice outlaw award 2nd place
jae 2011 ice outlaw award 1st place
is300_dino
07-06-2018, 02:53 AM #56words words words, lol wheres the pictures :p
jae 2010 best lexus category show and shine winner
jae 2010 ice outlaw award 2nd place
jae 2011 ice outlaw award 1st place
![[Image: District9_Prawn_small-thumb-550x308-21280.jpg]](http://blastr.com/assets_c/2009/07/District9_Prawn_small-thumb-550x308-21280.jpg)
07-06-2018, 03:00 AM
jae 2010 best lexus category show and shine winner
jae 2010 ice outlaw award 2nd place
jae 2011 ice outlaw award 1st place
is300_dino
07-06-2018, 03:00 AM #60the only place pictures of your engine should be located is in that folder now youve made it all x-rated :drool:
jae 2010 best lexus category show and shine winner
jae 2010 ice outlaw award 2nd place
jae 2011 ice outlaw award 1st place
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