For those who think blowby is minimal....
07-22-2005, 04:24 PM
#1
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For those who think blowby is minimal....
As you might recall, I installed ONE WEEK AGO (give or take a few days) a reservoir to "intercept" the oil blowby that goes from the PCV valve and gets dumped into the intake manifold.
Well, checked it today, and it's already 1/4 full!
So, here you can see all the crap oil that's getting dumped into your intake system, gunking up things and reducing fuel octane. I will also note that I ran a tank of 89 octane last week (short on cash at the pump) and even with my timing at 17 degrees I had NO knocking at all...I have a little suspicion that getting that oil out of the intake air may very well have had a positive effect on octane in the fuel, but who knows. Supposedly there is even MORE blowby on the VQ35 than in our VQ30s, to boot.
EDIT:
1. By the way, I installed a new PCV valve at the same time.
2. Credit to "2002 Maxima SE" who did this first.
In any case, here's how much oil collected in just a week of normal driving!
Well, checked it today, and it's already 1/4 full!
So, here you can see all the crap oil that's getting dumped into your intake system, gunking up things and reducing fuel octane. I will also note that I ran a tank of 89 octane last week (short on cash at the pump) and even with my timing at 17 degrees I had NO knocking at all...I have a little suspicion that getting that oil out of the intake air may very well have had a positive effect on octane in the fuel, but who knows. Supposedly there is even MORE blowby on the VQ35 than in our VQ30s, to boot.
EDIT:
1. By the way, I installed a new PCV valve at the same time.
2. Credit to "2002 Maxima SE" who did this first.
In any case, here's how much oil collected in just a week of normal driving!
07-22-2005, 04:43 PM
#5
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Originally Posted by Metal Maxima
Irish, wow...what a simple yet ingenious innovation. 
Was a how-to posted for this? 
Was a how-to posted for this? You can also get larger reservoirs on ebay so you don't have to empty it every month (note, on mine there is a purge valve at the bottom so you can just drain the oil into a paper towel or little jar or whatever)
here's a link to the original thread when I did it:
http://forums.maxima.org/showthread.php?t=417081
07-22-2005, 10:08 PM
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Originally Posted by bremner44
will it work for 5.5 gen too? isn't our pcv valve behind the engine on the other side?
07-22-2005, 10:23 PM
#11
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Well, I know what Im doing this weekend now.
Any good suggestions for intake cleaners? I really dont feel like taking apart my IM right now. Its way too hot to be playing around in the garage. Yeah I know
.... Dont give me any crap. haha
Any good suggestions for intake cleaners? I really dont feel like taking apart my IM right now. Its way too hot to be playing around in the garage. Yeah I know
.... Dont give me any crap. haha
07-23-2005, 06:27 AM
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Originally Posted by irish44j
I won't take credit for it, a few of the 3.5 guys had done it in the past, and some of the FI 4th gens as well. I may be the first 3.0 5th gen to do it.
You can also get larger reservoirs on ebay so you don't have to empty it every month (note, on mine there is a purge valve at the bottom so you can just drain the oil into a paper towel or little jar or whatever)
here's a link to the original thread when I did it:
http://forums.maxima.org/showthread.php?t=417081
You can also get larger reservoirs on ebay so you don't have to empty it every month (note, on mine there is a purge valve at the bottom so you can just drain the oil into a paper towel or little jar or whatever)
here's a link to the original thread when I did it:
http://forums.maxima.org/showthread.php?t=417081
07-23-2005, 08:37 AM
#16
hey i'm not getting anything about the blowby for the 3.5 on google. Would you be so kind as to post the link to the writeup?
New love - I use Chevron techron religiously to keep things clean in there. I think theres a rebate out now where its practically free.
New love - I use Chevron techron religiously to keep things clean in there. I think theres a rebate out now where its practically free.
07-23-2005, 08:51 AM
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Originally Posted by DJ2Max
hey i'm not getting anything about the blowby for the 3.5 on google. Would you be so kind as to post the link to the writeup?
New love - I use Chevron techron religiously to keep things clean in there. I think theres a rebate out now where its practically free.
New love - I use Chevron techron religiously to keep things clean in there. I think theres a rebate out now where its practically free.
It was done by "2002 Maxima SE" on the 3.5, he did it a few different ways.
http://forums.maxima.org/showthread....ight=oil+catch
07-23-2005, 09:44 AM
#20
Hi all,
Had no idea this was a problem on the 3.0 as well. I changed mine out to a larger catch-can (bought a generic one off ebay) so I wouldn't have to dump it as often.
As you can see, it still mists the oil quite a bit. There is still oil going back to the intake, but not as much.
Had no idea this was a problem on the 3.0 as well. I changed mine out to a larger catch-can (bought a generic one off ebay) so I wouldn't have to dump it as often.
As you can see, it still mists the oil quite a bit. There is still oil going back to the intake, but not as much.
07-23-2005, 10:41 AM
#21
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what size are the inlets on the catch can, i went to homedepot and couldnt not find a inline oil filter, lowes is not open yet, i got a craftsman large inline oilfilter from sears and large and micro inline oilfilter from harbor freight, only prob is that the inlets are 3/8" or 1/4" is that ok? i assume I should go with the larger filter since so i dont have to clean it as much?
07-23-2005, 11:22 AM
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Originally Posted by nailz420
Is there any change in perfomance, positive or negative?
Originally Posted by me
I will also note that I ran a tank of 89 octane last week (short on cash at the pump) and even with my timing at 17 degrees I had NO knocking at all...I have a little suspicion that getting that oil out of the intake air may very well have had a positive effect on octane in the fuel, but who knows
07-23-2005, 11:40 AM
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Originally Posted by nailz420
knocking makes engine retard timing, decreasing performance and fuel economy. Since this mod decreases knocking shouldnt this increase performance?
07-23-2005, 11:45 AM
#27
Originally Posted by nailz420
knocking makes engine retard timing, decreasing performance and fuel economy. Since this mod decreases knocking shouldnt this increase performance?
This mod will catch the oil being blown through at low RPM. I did it to stop a low RPM ping I was getting (oil lowers octane). It worked 95%. Some still gets through.
07-23-2005, 01:48 PM
#29
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Who hoo, I jsut go back with all the supplies! Now I just ahve to figure out where to mount this sucker... I cant take the easy way out and just copy you Irish. I still got my stock intake.
Also, did you notice that on the reservoir it says to avoid synthetic oils? Alright... thats it... no more Mobil 1
We'll just ahev to see how it goes.
Also, did you notice that on the reservoir it says to avoid synthetic oils? Alright... thats it... no more Mobil 1
We'll just ahev to see how it goes.
07-23-2005, 02:18 PM
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Originally Posted by NewLoveI30
Who hoo, I jsut go back with all the supplies! Now I just ahve to figure out where to mount this sucker... I cant take the easy way out and just copy you Irish. I still got my stock intake.
Also, did you notice that on the reservoir it says to avoid synthetic oils? Alright... thats it... no more Mobil 1 We'll just ahev to see how it goes.
Also, did you notice that on the reservoir it says to avoid synthetic oils? Alright... thats it... no more Mobil 1
We'll just ahev to see how it goes.
07-23-2005, 03:21 PM
#33
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Originally Posted by irish44j
I think it just says to avoid synthetics because they might pass through the filter a little better, which you don't want if you're using it in an air compressor. I use Mobil 1 myself.....since the filter still "vents" air/fumes into the intake manifold, I can't see how there could be any problem. If the thing breaks....oh well, not like it's expensive
Anyway, I just finished my set-up and found a great place to mount the reservoir, especially if you have a stock intake. I just used a 1" pipe strap and bent one side around the reservoir so it can sit inside snugly. Then I just bolted the other side of the strap to the VIAS where the original bracket held the original hose.
This location is nice and close to both the inlet and outlet so you dont have hoses running across the engine bay. It's not difficult to access, so it can be emptied fairly easily. And when I get my Cattman CAI, I will be able to pivot the whole thing in place and get an even straighter shot to the to the inlet making the install even cleaner.
I dont have my camera now, but Ill try to post some pics tomorrow.
07-23-2005, 03:52 PM
#34
Originally Posted by NewLoveI30
Haha, I was just joking. Im not too worried about it.
Anyway, I just finished my set-up and found a great place to mount the reservoir, especially if you have a stock intake. I just used a 1" pipe strap and bent one side around the reservoir so it can sit inside snugly. Then I just bolted the other side of the strap to the VIAS where the original bracket held the original hose.
This location is nice and close to both the inlet and outlet so you dont have hoses running across the engine bay. It's not difficult to access, so it can be emptied fairly easily. And when I get my Cattman CAI, I will be able to pivot the whole thing in place and get an even straighter shot to the to the inlet making the install even cleaner.
I dont have my camera now, but Ill try to post some pics tomorrow.
Anyway, I just finished my set-up and found a great place to mount the reservoir, especially if you have a stock intake. I just used a 1" pipe strap and bent one side around the reservoir so it can sit inside snugly. Then I just bolted the other side of the strap to the VIAS where the original bracket held the original hose.
This location is nice and close to both the inlet and outlet so you dont have hoses running across the engine bay. It's not difficult to access, so it can be emptied fairly easily. And when I get my Cattman CAI, I will be able to pivot the whole thing in place and get an even straighter shot to the to the inlet making the install even cleaner.
I dont have my camera now, but Ill try to post some pics tomorrow.
07-23-2005, 03:57 PM
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Originally Posted by 2002 Maxima SE
Are you using the output from the PCV located on the rear passenger side of the engine? Nothing comes out of the outlet that vents to the intake tube (driver side).
07-23-2005, 03:59 PM
#36
Originally Posted by irish44j
I think he has a VQ30. In our engines, the PCV is on the driver's side, just below the VIAS actuator. It's not anywhere near where the VQ35 PCV or intake manifold connector is.....
07-23-2005, 08:23 PM
#39
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If you are so concerned about separating oil out of the PCV line then what about the crankcase vent line? It is connected upstream of the throttle body and the breather vapors from the vent line are responsible for the gumming up of the throttle body assembly and obviously the rest of the intake system.
07-23-2005, 08:25 PM
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Originally Posted by P. Samson
If you are so concerned about separating oil out of the PCV line then what about the crankcase vent line? It is connected upstream of the throttle body and the breather vapors from the vent line are responsible for the gumming up of the throttle body assembly and obviously the rest of the intake system.