Installing an oil catch can on a gen2 prius

Discussion in 'Gen 2 Prius Accessories & Modifications' started by Frijjj, Sep 17, 2019.

  1. Frijjj

    Frijjj Junior Member

    Joined:
    Aug 9, 2019
    43
    25
    0
    Location:
    Runcorn, UK
    Vehicle:
    2008 Prius
    Model:
    N/A


    Found this excellent write up in another thread and thought I would use it as a start for a gen2 oil catch can round up. I'm about to install a catch can, I'm just waiting on the parts to turn up so looking around for ideas for where to put it. Preventative Maintenance for Oil Burning 2nd Prius | PriusChat

    The gen3 has a great thread: Oil Catch Can, Eliminate that knock! | PriusChat



    Excessive oil consumption. Issue resolved by Toyota. | Page 7 | PriusChat
    macondo100 has a different diy install that is a much smaller catch can.

    158947_IMG_3236.jpg 158946_IMG_3235.jpg


    And this is when I first became aware of the idea of fitting a catch can - and yet another mounting option!
    200,000 Mile Club | Page 35 | PriusChat
    nssdiver seems to have found a way to fit it between the throttle body and the radiator.

    172925_IMG_0095.jpg

    So if you have any other options for catch can mounting in a gen2 please post some pictures!
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    85,364
    37,620
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    thanks!

    i didn't realize it was a problem on the gen2. all the best!(y)
     
  3. alex s

    alex s Junior Member

    Joined:
    Apr 3, 2012
    16
    2
    0
    Location:
    las vegas
    Vehicle:
    2008 Prius
    Model:
    N/A
    I’ve always considered this a gen3 issue, but I’m very interested to see how it turns out on the gen2! A catch can is never a bad thing as far as I’m concerned.

    Good luck!
     
  4. Frijjj

    Frijjj Junior Member

    Joined:
    Aug 9, 2019
    43
    25
    0
    Location:
    Runcorn, UK
    Vehicle:
    2008 Prius
    Model:
    N/A
    It's more from the P0420 bad cat code. It seems that at some point over 200,000 miles on the clock the gen2 oil consumption increases dramatically.
    Toyota do seem to have an issue with the lower oil sealing piston rings becoming stuck and the oil channels clogging on many engines causing increased crankcase pressure. This results in increased oil transfer from the pcv into the throttle body.
    The oil is then combusted and the catalyst becomes clogged.
    Obviously the same problem occurs with warn rings so if it's not fixed with an engine flush, it needs a rebuild or replacement engine. The catch can is a cheaper fix.

    I don't know much history on my car but I live in an area where they salt the roads in winter and my catalyst has no corrosion to the outside so it's pretty new and already throwing a code. I'm hoping a catch can will extend the life of the new catalyst.

    I'm still waiting on delivery of my catch can so I've been researching the forum for gen2 catch cans and they don't seem to be that common. It could be that I'm totally wrong with my assumptions. I'm not a mechanic by trade and I'm just going on what I've found on the forum. It's a great source of knowledge.
     
    SFO and Kaptainkid1 like this.
  5. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    7,631
    3,310
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    What kind of engine oil do you use brand and weight?
     
  6. Frijjj

    Frijjj Junior Member

    Joined:
    Aug 9, 2019
    43
    25
    0
    Location:
    Runcorn, UK
    Vehicle:
    2008 Prius
    Model:
    N/A
    I'm using shell helix hx7 5w30 fully synthetic but I've no idea what was previously in the car. I get 5 litres for around £15-20 so it's not too expensive
     
  7. Kaptainkid1

    Kaptainkid1 Junior Member

    Joined:
    Mar 13, 2019
    83
    58
    0
    Location:
    Los Angeles
    Vehicle:
    2009 Prius
    Model:
    III
    As part of my new maintenance on the Gen 2 Prius is I do a seafoam oil flush at the end of all my oil changes. I've tried Tranny fluid too but thought it's best to stick to one method for a while and see if it works. I'm on my second oil change with the seafoam flush. The oil burning is the same as before: 1/4 qt every 1000-1400 miles. I'm at 170k now and my goal is to reduce and clean any oil sludge build up on the lower oil ring return oil passage. I know this is the major issue with Prius burning oil problem. Oil Catch can helps with maybe 10% of burn issue. I've also read people put marvel mystery oil in all 4 of the Piston chamber through the spark plug hole for a couple days. I heard it breaks up the hard oil sludge deposits via a soak. Who knows maybe that would be my next step to try to reduce my oil consumption.

    SM-J737T1 ?
     
    Frijjj likes this.
  8. MidnightSun

    MidnightSun Junior Member

    Joined:
    Mar 18, 2015
    10
    3
    0
    Location:
    NorCal
    Vehicle:
    2006 Prius
    Model:
    III
    I'm interested to see if Catch Can helps reduce oil consumption. PCV replaced at 216k with OEM part. I got P0420 in 02/2017 and replaced the original Cat at 236k miles. Denso O2 sensor replaced at 262k. Oil consumption has been increasing since. Just sent in the oil sample to BlackStone this week.
     
  9. T.S. Elliot

    T.S. Elliot Junior Member

    Joined:
    Jul 1, 2015
    55
    14
    0
    Location:
    Desolation Row
    Vehicle:
    2007 Prius
    I have been running an oil catch can in my 2007 for at least 35,000 miles. Installed it with new PCV. It is just a cheap one with a tiny little rod for a "baffle" but I never have any problems filling it up. In fact, it's usually pretty full. I try to empty it every 5k miles. I attempted 10k once but it was definitely way too long then. The problem is that it's a little tough to change since I jimmy rigged it with spare hardware found in the trash at the time as a temporary fix and now we are going on a couple years. I can take pics tomorrow of the set up and I'm due for an oil change so maybe I can get that done too and post pics of the most recent change.

    I do have this pic from a couple oil changes awhile ago. The contents usually end up split between a water based layer on the bottom and a lighter layer of oil on top. In this picture you can see the tan oil layer that has been poured into the drain pan and the water still remains in the can. I am running Mobil 1 AFE 0W-30 changed every 5k.

    [​IMG]
     
  10. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

    Joined:
    Oct 17, 2010
    37,589
    26,362
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Geez looking at that picture I could smell it, for just a sec.
     
    T.S. Elliot likes this.
  11. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    7,631
    3,310
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two

    The G2 is a pretty clean running motor. It all depends on what quality of oil you use. Catch can works but really unnecessary if you have good quality oil. Plus your defeating its #1 mission which is zero emissions.

    My bought new 07 at 140000 miles does not use any oil at all really between 5000 mile oc's. I use very high quality oil thats essentially a 40 weight. And never ever let the oil get below the full line.
    No sludge here.

    Kapankid & T.S. lets see pictures of your valve train please.

    Here's pictures including borescope of piston top @ 125,000 miles:
     

    Attached Files:

    SFO and T.S. Elliot like this.
  12. Kaptainkid1

    Kaptainkid1 Junior Member

    Joined:
    Mar 13, 2019
    83
    58
    0
    Location:
    Los Angeles
    Vehicle:
    2009 Prius
    Model:
    III


    I'm not pulling my valve cover so you can see my valve train is clean. The problem with Toyota's burning oil is the oil ring on the Piston. I'm the one who decided to put an oil catch can to filter out the oil droplets coming from the PVC valve. I wrote a post / DIY on oil catch cans on 2nd Gen Prius and people are reading it."EdtheFox5" do you know the Prius is not a Zero emission vehicle? It's a hybrid which has gas engine and electric motor. Also the Catch Can mod doesn't make the Prius less clean or vent out engine gases into the atmosphere. It goes right back into the throttle body and burns through typical engine cycle.
    Secondly you mentioned you keep your oil filled to the top notch and you use "good oil" at 40wt. I assuming you're using 10-40wt full synthetic and fill your oil once it drops. Which means your Prius is burning oil and keep it topping it off once you see it drop. I used 10-30wt Mobile Full synthetic recommend by the Toyota factory. I also know people who slow down the oil burning by using higher weight like 10-40wt. This could be the reason why you don't see much of a oil burning problem even though it's happening. The oil sludge is still gumming up your Piston rings. It's a design flaw! The only real solution is updating to the new redesign toyota Piston and new rings. That's overkill and not practical for car with 150k miles. My ideal is to keep a close eye on the problem and try resolve the dirty oil rings issue with aftermarket seafoam engine cleaning solutions, do my oil changes with full synthetic on time 6000-7000 miles and keep the oil filled to top notch at ever 1000 miles oil check up

    SM-J737T1 ?
     
    #12 Kaptainkid1, Sep 27, 2019
    Last edited: Sep 27, 2019
    T.S. Elliot likes this.
  13. 69shovlhed

    69shovlhed Surly tree hugger

    Joined:
    May 13, 2012
    2,073
    665
    0
    Location:
    sterling, VA
    Vehicle:
    2006 Prius
    I'm thinking if you use full synthetic and change it when the maint light comes on every 5k, oil consumption won't likely be a problem until at least 200k. I have never noticed a problem driving 3 different gen 2's since 2006. when I change the oil, it looks kinda reddish like it really could go another few 1000, but I figure its cheap insurance (that and I get mobil1 5w40 free from the dealership I work at) to keep clean oil in the engine. but there could be other factors involved. I've always believed its good to accelerate hard to blow it out regularly; that might help burn the gunk off the piston crown and rings.
     
    T.S. Elliot likes this.
  14. T.S. Elliot

    T.S. Elliot Junior Member

    Joined:
    Jul 1, 2015
    55
    14
    0
    Location:
    Desolation Row
    Vehicle:
    2007 Prius
    Changed oil this weekend and emptied the can. It was about half full so 5k seems like a decent interval. Still was the same 1/2 water 1/2 oil consistency. I don't mind not dumping it into the intake. Due for an air cleaner in 10k so I will pull the box and inspect the throttle body. I already know that this setup won't eliminate the oil puddle entirely but as we know that's not really a concern anyways and it does lessen it to a degree.
    [​IMG]
    [​IMG]
     
    ydpplqbd, Frijjj and Mendel Leisk like this.
  15. Frijjj

    Frijjj Junior Member

    Joined:
    Aug 9, 2019
    43
    25
    0
    Location:
    Runcorn, UK
    Vehicle:
    2008 Prius
    Model:
    N/A
    I have the exact same catch can and was struggling to see where to fit it as it's just a bit too tight by the maf. Is it just a circle clip to the air pipe on yours holding the catch can?
     
    T.S. Elliot likes this.
  16. T.S. Elliot

    T.S. Elliot Junior Member

    Joined:
    Jul 1, 2015
    55
    14
    0
    Location:
    Desolation Row
    Vehicle:
    2007 Prius
    Yes, but I wouldn't do it this way. You could do better. I've always been worried about rub and chafng, plus any constriction of the air pipe. Doesn't actually seem to be an issue though, so I leave as is.
     
  17. T.S. Elliot

    T.S. Elliot Junior Member

    Joined:
    Jul 1, 2015
    55
    14
    0
    Location:
    Desolation Row
    Vehicle:
    2007 Prius
    How much psi roughly comes out of the crankcase? Google offers a small range of 2 to 6 psi, but its an enthusiast's number. Anyways not much, and I wonder how much is at the throttle body? and then with a set up like this? Is the throttle body even designed with this small psi in mind or would it be happier sealed off? I already have the can, if I vent to the atmosphere and not dump anything into the TB would it be better?
     
  18. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

    Joined:
    Oct 17, 2010
    37,589
    26,362
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Reading up a bit here:

    How does a positive crankcase ventilation (PCV) system work? | HowStuffWorks

    PCV is mainly vacuum driven, sucks the most air through when the engine's just idling. As the engine rev's up vacuum (in the intake manifold) drops, and flow of air through the PCV reduces. At hard acceleration the intake manifold might actually go into pressure, and then the PCV valve will stop any flow in the other direction, if it's functioning properly.

    I wouldn't vent to atmosphere, gives us a bad name, lol.
     
    #18 Mendel Leisk, Oct 3, 2019
    Last edited: Oct 3, 2019
    T.S. Elliot likes this.
Loading...