AUDI TT MK1 8N S3 8L 1.8T 20V Do You Need A PCV Valve ???? (PART 1)

[@kennyfontaine4762]

I feel like a side effect of your engine running properly is a shaking oil cap at idle. It's when your idling and your oil cap is vacuumed to your valve cover that you have a pcv issue. I've worked on many 1.8t engines over the years and they have always operated this way. Then again, im not a professional but it's something I've noticed over the years. Btw, awesome videos Chris!

[@CarChris82]

Thanks mate that's good to know but connected to the inlet there should be some vacuum as thats a constant vacuum source ?

[@kennyfontaine4762]

@Car Chris Yeah, I think you should have vacuum at the tip or at least on one end of the hockey puck i think. The hockey puck acts as a pvc sort of from what I gather. For instance, if you have both the pcv and the hockey puck removed from your engine, the oil cap ( or in your case cardboard) "should" vacuum to your rocker cover which is a bad thing lol. In the end I think you're fine just running the hockey puck without the pvc. But like I said I'm not professional I just work on my own vehicles and notice things like this one I a while. I wouldn't wanna be responsible if you blew up you're beautiful TT

[@CarChris82]

@@kennyfontaine4762 thanks mate the pucks main purpose is to regulate the vacuum supply to the crankcase during boost

[@hakgar]

I had a bouncing oil cap on my 1.8 20vt audi b6 quattro and a lot of oil consumption (only 130.000km's though).Changed the pcv valve with a new one and no more bouncing cap. Need to check my oil level from now on.

[@markreed8644]

Glad you did this video as I have all the parts to do it but wont bother now as it seems to makes no difference 🙂

[@CarChris82]

it maybe worth fitting as it wont do any harm

[@markreed8644]

@@CarChris82 what about fitting the pcv valve further back towards the manifold, I noticed that Nath on his diagram fitted the valve that way ?

[@CarChris82]

If its on the same route the vacuum would be the same but I got some bits coming to have a play around with and will do a part 2

[@greggould2643]

I just replaced my PCV system with new like for like parts, with forge motorsport hoses new genuine 90° bend, puck and new PCV valve fit and forget, I had a catch can and it filled up quite quickly this time of year to much hassle for me and awkward to unscrew to empty.

[@TTAutowerks94]

Can tell you paid alot of attention in the group and did your own research :D brilliant video mate.. only thing I'd say is that as you explained the turbo will only pull vacuum when it's spooling.. as I always drive with my guage on.. even when your driving at anything less than 15% throttle (low load driving) anything under boost will still give the negative pressure in the inlet :) which still as you know removes the blow by pressure..

[@CarChris82]

Thanks mate thats good to know 👍

[@bravo20ghost27]

Great video mate. I have seen some interesting things about the whole oil catch cans and oil vapours. The catch cans can actually add resistance which then allows a slight increase in pressure. Why not try your PCV without the catch can (just as a test)? Also the oil vapours are more of a problem with direct injection engines. No catch can would just mean cleaning the intake manifold as part of the service.

[@chriswray2132]

what is the long term effect of just leaving this as it is ? i have a catch can to fit for over 6 months now, i suspect its gonna stay there in its box

[@jules13692]

Hi Chris, great video, I'm thinking the pcv should be in the original place to suck idle pressure (small vacuum created by inlet manifold), and when you start revving, the turbo kicks in and will create a bigger sucking force and redirect blow-off through catch can? being bigger diameter than the inlet nipple...my 2 cents, just thinking out loud. On ttforum some guys say that you need the pcv even if you got a catch-can, to help oil drain in turbo oil return line, and probably to avoid damaging the valve seals. I guess the muck wil get into the PCV. some of it, but most blow-by will get to catch-can on high revs. How did you solve it since this video?

[@benjames6929]

Thanks tor taking the time to check a theory out. Saves us lot time and money to fix other stuff 🤣

[@CarChris82]

No worries mate wasn't the result i wanted but glad it helps helps 👍

[@benjames6929]

@@CarChris82 still a good result though mate. Thanks for the time to show us 👍

[@CarChris82]

@@benjames6929 🔥🔥🔥👍🏻

[@peterlowden3814]

Good on ya for trying something out mate, keep us posted if you figure it out

[@CarChris82]

@@peterlowden3814 thanks mate will look into this further 👍

[@tec-to]

I think I’ve come to the conclusion that this behavior is completely normal. When I had the standard PCV system fitted, oil cap bounced, figured the components were just worn out, so I replaced with the 034Motorsport kit (no catch can), and there was no difference afterwards.

[@CarChris82]

Could be mate I reckon more people have the cap bouncy than not and another person commented that the 034 valve doesn't allow as much air to go through it than a oem one

[@TheParrottBros]

Great video mate

[@CarChris82]

Cheers mate its something that has been on my mind 🤔

[@jiffers1316]

Just a thought if you removed the puck out of the system and put the pipe from the catch can directly to the tip it would always under vacuum

[@CarChris82]

Its best to leave the puck in place,the pcv valve is fitted before the puck and has a constant vacuum from the inlet manifold

[@benofthenorthuk]

Nice! The PCV system on these is such a dark art, hope you figure something out in the end.

[@CarChris82]

It sure is mate 👍

[@alaindunkerque59]

Belle vidéo 👌 😉 TT 👍

[@CarChris82]

merci mon ami content que tu apprécies les vidéos 👍

[@alaindunkerque59]

@@CarChris82 Merci aussi. Oui c super 👌 😉

[@ttgarage7727]

Believe it only functions properly under boost

[@barryrappers7594]

Hi mate, as per std set up what about putting the valve on the other side before the hose joins the valve cover and then goes to the catch can?

[@CarChris82]

doing that would allow the nasty oil vapours to go into the inlet manifold and not be filtered out by the catch can

[@Kris-xm3sz]

I'm not sure how reliable this test of positive pressure or vacuum at the oil filler hole is. The oil pump itself is surely going to always be creating a lot of positive pressure in there. Ive run my 1.8t without pcv for years. But I'm going to put it back in. Having a boost gauge now has made me notice how the inlet is under vacuum most of the time in a daily driver.

[@CarChris82]

Thank you for the comment,test shows that there is positive pressure in the rocker cover which should be pulled out by the vacuum created by the inlet manifold 👍🏻

[@TTAutowerks94]

@@CarChris82 that was very accurately said Chris 🙏

[@noel5ilv3rlake]

… been trying 3 times to just change the old this little vacuum but since mine is still under OE / hose/ etc of the PCV system, my laziness, I cannot remove those 2 of OE clamps on T HOSE I damn hate it 😅probably sure I need to cut ‘em off so i still have the replacement little billet vacuum in pocket maybe I will do it again this weekend but it’s cold here ! Good vid !

[@CarChris82]

😂🤣

[@walther89]

just a simple catch can install to atmosphere and cap the bottom of intake manifold thats it

[@Bangerboy985]

@Car Chris hey bro have you tried this guys solution yet??? because I've been wanting to do this exact thing.

[@mp-ez1it]

pcv valve before turbo...?why...?dont work the can catch in other way..?i thing to delete valve but afraid of presure the system much...my cap stop move only if i put valve normal as come from audi..my can catch also dont work have it in same place place like you.... i will relocated it...i read that as u put it more closer low the presure more

[@GCS88]

The relief cut on the billet one is smaller than OEM I filed mine wider due to the same issue (cap not being held by vacuum)

[@CarChris82]

Good to know mate I might do the same 👍🏻

[@GCS88]

@@CarChris82 To be honest 034 should have fixed it as they revised this PCV years ago but only changed the spring rate apparently do you think you can post a disassembly? I want to see how different it is from the old version

[@CarChris82]

@@GCS88 I maybe able to if I can take it apart and put back together again without problem or i may try a standard one and see if that gives me better vacuum

[@GCS88]

@@CarChris82 it should be easy since they didnt change the design it just twists off, the OEM will give you a way better vacuum though as the relief holes are optimal than the billet Ps when I say relief hole I'm referring to the side notch inside the valve

[@CarChris82]

@giansantiago I look into this mate and play around with the valve and see if the oem one sorts it thanks for the info 👍🏻

[@ΧαράλαμποςΚαναλουπίτης]

Hey man, did you solve the problem? I got the same issue with my 2001 New Beetle 1.8T

[@grantyleber2336]

Can’t make any suggestions mate as I’ve no clue what you have done 🤣 certainly wasn’t any worse which can’t be bad! I’m sure you’ll sort it mate bit of trial and error! 👍

[@CarChris82]

Thanks mate I was just adding a simpler way of a pcv system to pull positive pressure out and back to the inlet manifold

[@Skagen63]

01:23 Mate, i think you could have wrong understanding of the "Pancake-valve". It's function is to restrict the flow to the inlet pipe when needed. What I am trying to say is that the valve is always open

[@CarChris82]

The valve is open on idle and closed under load which restricts the flow to the inlet mani and then turbo intake pipe pulls the pressure through

[@TTAutowerks94]

I'd be Interested to see I'd it made a difference when you remove the oil cap spacer. I'm pretty sure that doesn't actually have a seal mate.. so would cause a slight vac leak on cam cover which would void any wanted vacuum at the cap.. regardless, you now know that the blow by gasses are being pulled instead of building .. getting recycled just as ever ICE is designed to do.. but with a catch can inline :) cleaner and simpler good job mate

[@darrenfrost8582]

I tried both with spacer and without no difference 👍

[@TTAutowerks94]

@@darrenfrost8582 and yours have no vacuum on the cap at all ? It should have itself sucked to the cover.. unless you pull it up with ease.. but the cardboard isn't a good test really as that doesn't seal at all... So it will always blow through

[@darrenfrost8582]

Has the slightest vacuum when you pull up the cap but then bounces around

[@KrystianZakrzewskiferrero]

Hi iv got some issues with my bam engine First thing is my vacuum hoses and pipes I’m on groups and asking around trying to find out where to get dose pipes hoses and the location where they go the air intake hoses have a little crack and I’m having some vacuum issues can you please help me out thx and my oil Cap is bouncing just the same as urs

[@CarChris82]

Do you mean the vacuum pipes under the manifold?

[@Biffabacon68]

Surely the non return valve needs to go from rocker to the t piece before it joins pipe to catch can 🤷🏻‍♂️ thus preventing pressure going in but letting vacuum out

[@CarChris82]

The valve work from vacuum from the inlet manifold and if its fitted before the can it will put the nasty oil fumes back into the inlet without being filtered out by the can so would defeat the purpose or the catch can

[@Biffabacon68]

Right I see 👍🏻 but also where you’ve put the valve your still getting pressure to the can and through the t piece to rocker ? Is the t piece to the catch can pipe clean air return or dirty air pre cycle

[@Biffabacon68]

To stop pressure getting to the rocker it needs a no entry back into the rocker on that t so don’t know how you can overcome that if that’s the dirty air pipe to catch can

[@CarChris82]

@@Biffabacon68 everything before the can is dirty air which is pulled through the catch can by vacuum from the inlet manifold pcv valve and turbo intake pipe so only clean air is put back into the engine intake

[@Biffabacon68]

If you put a non return on that small t piece pipe from rocker fumes can’t get in but can get out to main catch can pipe thus not defeating the whole purpose of the catch can

[@busker_boy_c2845]

What if you swapped the valve round ? Would that do anything put it on backwards

[@CarChris82]

Then no vacuum would get pulled by the inlet manifold and so would be the same as not having one at all

[@benjames6929]

I think, maybe, the valve is in the wrong place. The engine, at idle is making vacuum and pressure, hence the cardboard. Pressure is being vented from the head, into, the T piece, into catch can, then to Puck which then deposits it back to the intake system. Would The pcv valve have to replace the current T piec that splits to the head vent on route into the tank. That way it couldn't draw anything back

[@CarChris82]

Could be but where it is placed is after the catch can which is what you want if its before the can then no point having a can as it would be just pulling it all back through the inlet before being cleaned by the can it that makes sense

[@seanredmile7860]

Where do you get the bits from

[@CarChris82]

Creation motorsport and 034 motorsport 👍🏻

[@seanredmile7860]

Cheers dude

[@darrenfrost8582]

Did the exact thing as you chris and it made no diff exactly like yours

[@noel5ilv3rlake]

Some people said that if there is nothing happen on the oil cap it’s just fine 😂 ( 1.8 MK1)* This is completely the opposite of another new gen audi ‘ Cuz I have TT Mk1 and ea888 Gen3 S1 However I dunno…😊

[@CarChris82]

Its a strange one mate you think the vacuum from the inlet would pull the pressure out

[@darrenfrost8582]

@@CarChris82 maybe the 22mm pipe to the catch can is too big for the vacuum produced by the mani so loses vac pressure?

[@CarChris82]

@@darrenfrost8582 could be mate

[@chriswray2132]

ok so i spoke toi my freind at work, hes a mechanic and builds fast fords, he tells me this is to be expected. you might as well ask, why is a wheel circular, lol

[@micheleturi1967]

È meglio la configurazione senza pcv,meno tubi,meno rischio di perdere pressione turbo. Inoltre il tip fornisce comunque il vuoto sia al minimo che in accelerazione.

[@CarChris82]

estoy de acuerdo en que muchas personas ejecutan esta configuración sin pcv, yo también estuve sin problemas, pero quería ver si hacía alguna diferencia con una válvula pcv colocada nuevamente 👍

[@24welly]

Basically you put it back to standard with a lot of messing about

[@CarChris82]

I simplified the system

[@dh1380]

I think you need one. It's shit but a catch can is worse