JMB RetrofitsAH Fabrications
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  1. #1
    S3 Paul's Avatar
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    Strange Question after fitting catch can...

    I fitted a custom catch can a few weeks back now with the outlet currently vented to atmosphere.
    It was time to check the car over and mini service before winter... I thought this would be a good time to empty the catch can?
    So... i wedged a small cup under the drain plug...unscrewed it.
    Nothing came out. Nothing at all, Is this normal? I expected at least a splash, But nothing .
    Noggy Blue 2001 S3

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  3. #2
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    I have had nothing out of my catch can in the 3 months ive run it.

  4. #3
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    Quote Originally Posted by rustya3 View Post
    I have had nothing out of my catch can in the 3 months ive run it.
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    should have a little bit, even if its just a oily/watery mixture.
    Driving the most secretive S3 on ASN

  6. #5
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    Strange Question after fitting catch can...

    Depends on wether and how the catch can is baffled as alot of the unbaffled ones will let most of the vapours pass straight out the outlet before condensing to a liquid

    Would expect to still see some in there though?
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  7. #6
    vrbob's Avatar
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    Mine is unbaffled and also venting to atmos and been on about 6 weeks and is half full so gonna empty it soon. So surprised youve got nothing in yours are you sure its all fixed up right?
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
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  8. #7
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    I have had oily residue in there but nothing enough to drain,Mine is a home made can I turned up on the lathe and has the full size inlets and outlet it also isnt baffled and steams constant when the car is upto temp on tickover.

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    After 2000 miles I had about 50ml of oil water mixture so not alot how long have you had it on ?

  10. #9
    S3 Paul's Avatar
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    Mine is un baffeled, But there is no residue at all where the outlet is. its strange every where is dry. I can feel air passing through the catch can. but therejust seems to be no mess. Wierd? or ok?
    Noggy Blue 2001 S3

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  11. #10
    s3dave's Avatar
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    If unbaffled i would be sure it would fill with condensate,,,,so yes weird..i get oily watery mixture out every week ..about 50ml

  12. #11
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    I've been emptying loads out of mine and that's 1 year it has been installed.

    Mine doesn't vent to atmosphere though, it re-circulates back in to the TIP and I wonder if that results in more being sucked through when on vacuum.

    When it's cold up here my catch can has been known to almost fill up in 3 weeks.

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    Strange Question after fitting catch can...

    I would expect a Baffled can to collect water and oil mix which is its purpose to stop it re entering the tip,the way I look at it the hot steam has no restrictions on a non baffled can so exits with no hold ups but the baffled slows the flow so cools and stays inside. Or am I talking waffle as usual lol.

  14. #13
    Westy's Avatar
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    Strange Question after fitting catch can...

    Mine didn't fill up at all when I first fitted it, then I realised the drainage screw wasn't done up and I'd been oiling my subframe
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  15. #14
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    I only installed mine last night. And after only 80 miles i have a small amount of water in there. Was only a tiny amount though.
    Mines been baffled with synthetic wire wool from homebase.
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  16. #15
    Alex C's Avatar
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    Quote Originally Posted by Westy View Post
    Mine didn't fill up at all when I first fitted it, then I realised the drainage screw wasn't done up and I'd been oiling my subframe
    Quote Originally Posted by Westy View Post


    saves it from rusting i guess

    do you see less oil in the can after changing it from vented to TIP to vented to atmoshere Westy?
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  17. #16
    Westy's Avatar
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    Strange Question after fitting catch can...

    Quote Originally Posted by Alex C View Post


    saves it from rusting i guess

    do you see less oil in the can after changing it from vented to TIP to vented to atmoshere Westy?
    About the same I'd say.
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  18. #17
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    As i was fitting my new filter today i took the opportunity to empty my catch can for the first time.

    Its been on for about 2-3 months now of which i first vented to the TIP and have since changed to venting to atmos. The catch can was about 3/4`s full so about 200ml of stuff, most of which seemed to be condensation that has reformed into water plus some oily mayo type stuff too. All cleaned out and but back together so will check it again in a couple of months.
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  19. #18
    Westy's Avatar
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    Strange Question after fitting catch can...

    Quote Originally Posted by vrbob View Post
    As i was fitting my new filter today i took the opportunity to empty my catch can for the first time.

    Its been on for about 2-3 months now of which i first vented to the TIP and have since changed to venting to atmos. The catch can was about 3/4`s full so about 200ml of stuff, most of which seemed to be condensation that has reformed into water plus some oily mayo type stuff too. All cleaned out and but back together so will check it again in a couple of months.
    Keep an eye on it over the cold Months bud as it does fill up quick.
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  20. #19
    vrbob's Avatar
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    Cheers for the TIP westy,

    i guess the cold weather makes for more codensation then hence it fills up quicker

    Defo happy that all that gunk and water isnt heading back into my TIP anymore too
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
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  21. #20
    Westy's Avatar
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    Strange Question after fitting catch can...

    Quote Originally Posted by vrbob View Post
    Cheers for the TIP westy,

    i guess the cold weather makes for more codensation then hence it fills up quicker

    Defo happy that all that gunk and water isnt heading back into my TIP anymore too
    If you were to take the boost hose off at the throttle body it should be nice and clean. That's what it's all about
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  22. #21
    vrbob's Avatar
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    yup i took off the throttlebody and cleaned it all up about a month ago (never done it before on this car) so had 10 years of crud on it and some oily residue etc but with a bit of electrcal cleaner and some elbow grease and it was looking nice and proper shiney when it went back together. So will do it again in a few months time and hope to see it all shiney still

    To be honest the most surprising place i found loads of cruddy oily stuff was in the old SMIC`s when i took it off to put my FMIC on!
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

 

 

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