Catchin' Oil
Joined: Aug 2002
Posts: 1,129
Likes: 0
From: Hi Desert, Kalifornia
djl,
I'd like to take this opportunity to thank you for this cost effective real world mod. Your explanation of "why" is quite detailed. Mine's slightly simplier and while not totally complete the basic theory is sound.
All engines experience "blow-by" the piston rings. Worn engines and those with FI usually experience more blow-by. This blow-by pressurizes the crankcase. On the VQ the pressurized crankcase is vented by the PVC valve to the lower collector's oil gallery which is under vacuum. The oil/combustion by-product vapors are drawn through the oil gallery's six small holes (one per runner) into the intake air stream. The air/oil vapors mix with the fuel injected at each intake port lowering the fuel's octane rating.
Thanks again!
DaveO
I'd like to take this opportunity to thank you for this cost effective real world mod. Your explanation of "why" is quite detailed. Mine's slightly simplier and while not totally complete the basic theory is sound.
All engines experience "blow-by" the piston rings. Worn engines and those with FI usually experience more blow-by. This blow-by pressurizes the crankcase. On the VQ the pressurized crankcase is vented by the PVC valve to the lower collector's oil gallery which is under vacuum. The oil/combustion by-product vapors are drawn through the oil gallery's six small holes (one per runner) into the intake air stream. The air/oil vapors mix with the fuel injected at each intake port lowering the fuel's octane rating.
Thanks again!
DaveO
djlfx,
Hehehe . . . I just got home awhile ago and I find your post. Thanks for the info and more importantly . . . Thanks for this excellent mod. I do not know where this is going . . . But I am quite pleased that all of that oily gunk is being trapped. Thank you!
Hehehe . . . I just got home awhile ago and I find your post. Thanks for the info and more importantly . . . Thanks for this excellent mod. I do not know where this is going . . . But I am quite pleased that all of that oily gunk is being trapped. Thank you!
Thats a cute comment Pasta boy....
Please let me know how it is that on a motor making upwards of 320 crank hp out of 1.9L, the VQ is so technically advanced. It's so damn advanced that the CAM TIMING increases the exhaust velocity, overcoming the backpressure a muffler creates....
back atcha..
I'm out, I've said what my experiances are, with real-world testing. If you wanted to save yourself some time and $$, you'ld tap into the exhaust where you plan on putting this venturi probe, and figure out how much vac you can't pull and at what point. Of course, this would require actual testing, and I'm sure the internet knowledge world will come to your rescue.
Please let me know how it is that on a motor making upwards of 320 crank hp out of 1.9L, the VQ is so technically advanced. It's so damn advanced that the CAM TIMING increases the exhaust velocity, overcoming the backpressure a muffler creates....
back atcha..I'm out, I've said what my experiances are, with real-world testing. If you wanted to save yourself some time and $$, you'ld tap into the exhaust where you plan on putting this venturi probe, and figure out how much vac you can't pull and at what point. Of course, this would require actual testing, and I'm sure the internet knowledge world will come to your rescue.
Last edited by Cracker Red; May 14, 2006 at 12:17 PM.
Originally Posted by DaveO
djl,
I'd like to take this opportunity to thank you for this cost effective real world mod. Your explanation of "why" is quite detailed. Mine's slightly simplier and while not totally complete the basic theory is sound.
All engines experience "blow-by" the piston rings. Worn engines and those with FI usually experience more blow-by. This blow-by pressurizes the crankcase. On the VQ the pressurized crankcase is vented by the PVC valve to the lower collector's oil gallery which is under vacuum. The oil/combustion by-product vapors are drawn through the oil gallery's six small holes (one per runner) into the intake air stream. The air/oil vapors mix with the fuel injected at each intake port lowering the fuel's octane rating.
Thanks again!
DaveO
I'd like to take this opportunity to thank you for this cost effective real world mod. Your explanation of "why" is quite detailed. Mine's slightly simplier and while not totally complete the basic theory is sound.
All engines experience "blow-by" the piston rings. Worn engines and those with FI usually experience more blow-by. This blow-by pressurizes the crankcase. On the VQ the pressurized crankcase is vented by the PVC valve to the lower collector's oil gallery which is under vacuum. The oil/combustion by-product vapors are drawn through the oil gallery's six small holes (one per runner) into the intake air stream. The air/oil vapors mix with the fuel injected at each intake port lowering the fuel's octane rating.
Thanks again!
DaveO
Thanks for the info guys!.. I hope this type of dialog flows into some of the other threads without all the BS that has phucked it up in the recent past.
Originally Posted by inTgr8r
Great thread guys....
Did my MREV-2 install today.
I was surprized at the amount of oil sitting in the gallery.
...One more thing on the to do list
Did my MREV-2 install today.
I was surprized at the amount of oil sitting in the gallery.
...One more thing on the to do list
Last edited by OCG35; May 14, 2006 at 05:53 PM.
Joined: Aug 2002
Posts: 1,129
Likes: 0
From: Hi Desert, Kalifornia
Here's what my catch can "caught" after 780 highway miles. The container is a standard shot glass. The dipstick level appears the same... maybe my engine is an oil generator. 
Mobile 1 5W-30 - 03 doggie door A/T Sedan with 28,768 miles
DaveO
Mobile 1 5W-30 - 03 doggie door A/T Sedan with 28,768 miles
DaveO
Thats not really to bad IMHO DaveO.... If you think about the motor loosing 3 times that much in ~3000K miles, or even 5 times that much, it's doubtful you'ld ever even notice it on a dipstick.
It would be interesting to do a leakdown test on those motors that were producing more and less oil. My GUESS would be those with the best sealing rings would push more oil out, but on something like the VQ, it's doubful that a good running motor would show much of a change even between say 3% and 6% ring seepage...
Do you have anything you can bump your timing up with, or modify the map at all?
It would be interesting to do a leakdown test on those motors that were producing more and less oil. My GUESS would be those with the best sealing rings would push more oil out, but on something like the VQ, it's doubful that a good running motor would show much of a change even between say 3% and 6% ring seepage...
Do you have anything you can bump your timing up with, or modify the map at all?
Joined: Aug 2002
Posts: 1,129
Likes: 0
From: Hi Desert, Kalifornia
Originally Posted by Cracker Red
Thats not really to bad IMHO DaveO.... If you think about the motor loosing 3 times that much in ~3000K miles, or even 5 times that much, it's doubtful you'ld ever even notice it on a dipstick.
It would be interesting to do a leakdown test on those motors that were producing more and less oil. My GUESS would be those with the best sealing rings would push more oil out, but on something like the VQ, it's doubful that a good running motor would show much of a change even between say 3% and 6% ring seepage...
Do you have anything you can bump your timing up with, or modify the map at all?
It would be interesting to do a leakdown test on those motors that were producing more and less oil. My GUESS would be those with the best sealing rings would push more oil out, but on something like the VQ, it's doubful that a good running motor would show much of a change even between say 3% and 6% ring seepage...
Do you have anything you can bump your timing up with, or modify the map at all?
I wouldn't consider this an abnormal amount of oil (I just don't want to burn it). I've never used a noticable amount of oil between oil changes.
My cars initial timing was bumped over three years ago as were the A/F and Timing maps.
DaveO
Originally Posted by DaveO
I wouldn't consider this an abnormal amount of oil (I just don't want to burn it). I've never used a noticable amount of oil between oil changes.
My cars initial timing was bumped over three years ago as were the A/F and Timing maps.
DaveO
My cars initial timing was bumped over three years ago as were the A/F and Timing maps.
DaveO
Joined: Jan 2004
Posts: 21,095
Likes: 47
From: Toronto, GTA north
Posted in the sticky thread as well, but if you missed it....
FWIW..
Here's some silicone vac hose that I found.
Vibrant Performance
FWIW..
Here's some silicone vac hose that I found.
Vibrant Performance
