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Post by swordspork on Sept 7, 2021 17:13:07 GMT
Hello I am currently in the process of fitting a catch can to my MK1 1.6. As per the instructions I understand that it says to blank off the connection on the inlet manifold (that would otherwise be connected to the pcv) but what do I do with the barb that will be left on the intake tract? (the barb that is on the arc chamber currently connected to the cam conver). It's not mentioned explicitly in the instructions and they only supply one cap.  |
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Post by wannabe on Sept 7, 2021 18:30:17 GMT
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Post by swordspork on Sept 7, 2021 19:35:44 GMT
Not sure that is helpful. It's for a turbo car with a 323 cam cover. Maybe the answer is obvious but I feel that in order to make the set up work as outlined in the manual (see image below) I need another blanking cap on the air intake piping near the throttle body...?  |
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Post by lowender on Sept 8, 2021 8:16:46 GMT
what do I do with the barb that will be left on the intake tract? (the barb that is on the arc chamber currently connected to the cam conver). It's not mentioned explicitly in the instructions and they only supply one cap. Just cap it. |
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Post by atlex on Sept 8, 2021 12:35:19 GMT
Ugh, the davefab again. Did their guide ever discuss removing the PCV ? I should tear into that prarrie canoe.
Honestly, I'd follow the equivalent of my advice for the thread above. If you're going to VTA, remove the PCV (replace with a barb fitting) and cap the other hose fitting on the cam cover. If you VTA with the PCV in, it just blocks the flow. Why even have a pipe there if nothing will flow.
But my advice since you're keeping the original intake manifold, is to not go VTA, route the catch can between the PCV and the intake manifold and leave the non-PCV side that feeds into the arc chamber via the front metal pipe "as is".
And remove the filter, replace that with a cap. If you keep the filter on, it's VTA by default, negating the PCV valve....
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Post by niklas on Sept 8, 2021 16:55:59 GMT
Davefab send an adapter replacing the pcv with their cans. As it should be.
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Post by swordspork on Sept 8, 2021 18:47:27 GMT
Ugh, the davefab again. Did their guide ever discuss removing the PCV ? I should tear into that prarrie canoe. Honestly, I'd follow the equivalent of my advice for the thread above. If you're going to VTA, remove the PCV (replace with a barb fitting) and cap the other hose fitting on the cam cover. If you VTA with the PCV in, it just blocks the flow. Why even have a pipe there if nothing will flow. But my advice since you're keeping the original intake manifold, is to not go VTA, route the catch can between the PCV and the intake manifold and leave the non-PCV side that feeds into the arc chamber via the front metal pipe "as is". And remove the filter, replace that with a cap. If you keep the filter on, it's VTA by default, negating the PCV valve.... Thanks for the advice, I really didn't want to bring it up again, but I do want to fit the thing. The guide isn't great to be honest, especially for the layman. So I've taken the above from what you've said. 1. The configuration they suggest in the manual doesn't make much sense. As it is working against the PCV. 2. I find a suitable cap for the catch can outlet that would have otherwise had the vent (sponge filter bit) attached to it. Therefore no longer being a vent to atmosphere setup? 3. Connect one pipe between the inlet manifold and the catch can. 4. Connect the other pipe between the catch can and the PCV. |
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Post by atlex on Sept 8, 2021 20:38:15 GMT
Ugh, the davefab again. Did their guide ever discuss removing the PCV ? I should tear into that prarrie canoe. Honestly, I'd follow the equivalent of my advice for the thread above. If you're going to VTA, remove the PCV (replace with a barb fitting) and cap the other hose fitting on the cam cover. If you VTA with the PCV in, it just blocks the flow. Why even have a pipe there if nothing will flow. But my advice since you're keeping the original intake manifold, is to not go VTA, route the catch can between the PCV and the intake manifold and leave the non-PCV side that feeds into the arc chamber via the front metal pipe "as is". And remove the filter, replace that with a cap. If you keep the filter on, it's VTA by default, negating the PCV valve.... Thanks for the advice, I really didn't want to bring it up again, but I do want to fit the thing. The guide isn't great to be honest, especially for the layman. So I've taken the above from what you've said. 1. The configuration they suggest in the manual doesn't make much sense. As it is working against the PCV. 2. I find a suitable cap for the catch can outlet that would have otherwise had the vent (sponge filter bit) attached to it. Therefore no longer being a vent to atmosphere setup? 3. Connect one pipe between the inlet manifold and the catch can. 4. Connect the other pipe between the catch can and the PCV. Sounds like you get it 2/3/4 sorted. I suggest decent quality fuel hose as it's cheaper than silicone hose. 8mm id should cover your needs. |
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Post by niklas on Sept 11, 2021 13:23:26 GMT
Catch can needs to have an outlet. Either into a non pressurized part of the inlet tract or vta.
For ref. I run both ports on valve cover to can, then a hose from the filter outlet to intake between turbo and filter. Forged turbo engine.
If you run only one side of the valve cover to can you'll catch half of the vapors.
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Post by atlex on Sept 11, 2021 14:57:44 GMT
Catch can needs to have an outlet. Either into a non pressurized part of the inlet tract or vta. For ref. I run both ports on valve cover to can, then a hose from the filter outlet to intake between turbo and filter. Forged turbo engine. If you run only one side of the valve cover to can you'll catch half of the vapors. Half of the vapors ehhh yeah sure half the 'potential' vapours but in truth, in my turbo setup the one side fills up and the other side never does. (I run dual catches, the OEM PCV and a OWV too). This isn't VTA. It's like an interrupted version of the OEM setup where there's a catch in both paths out the cam cover. Basically the one catch can is doing nothing. It should just be a small airfilter and I'd remove half a kilo of crap from my engine bay, but I can't have that because when the annual car test takes place they're looking for any 'potential' emissions outlets..  I don't know how much really would come out of the NON-PCV port if that was the only way out - Most of the flow on that port in the standard umodified setup is *in* and not *out*. At least on the Crumpet's setup with the 323 type cover it was dumping way too much oil when it was the only path out. |
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Post by atlex on Sept 11, 2021 14:59:59 GMT
On the standard setup my thinking is that on boost or full throttle when there's no vacuum on the PCV, sure something starts coming out of the other port (the engine has the breath!), but whatever comes out will just get sucked in again as soon as the foot comes off the throttle.
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Post by lowender on Sept 11, 2021 18:45:06 GMT
This is how mine is now plumbed: VTA filter removed, replaced with hose to inlet manifold.  Attachments:
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Post by niklas on Sept 11, 2021 20:15:13 GMT
Yup, the baffling seems to be heavier in the exhaust side. Still, its a way out, and diameters are small. Two is better than one. On a n/a build its probably fine to cap it off. I havent tried it.
If you dont catch anything there, just remove that can?
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Post by atlex on Sept 11, 2021 21:21:54 GMT
This is how mine is now plumbed: VTA filter removed, replaced with hose to inlet manifold. How's this working out for you in terms of oil consumption ? Does it fill up much ? |
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Post by atlex on Sept 11, 2021 21:27:41 GMT
Reason I ask lowender is that, if the right hand of those barbs is connected to the 'exhaust side' cam cover outlet, this will basically cause an equilibrium of pressures on both sides of the PCV valve, meaning the PCV valve will just block flow, since it is a 'resistor'/'restrictor'. It needs pressure difference to flow. .... I'd cap the right hand of the barbs (from the perspective of the photo) and put the the 'breather filter' on the exhaust side cam cover. You'll then get cross flow and the stuff in the head will be sucked out through the PCV valve, gently so as not to suck out too much oil. I realise I'm a catch can / engine breather spergasaurus. Please forgive me. |
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lol)
le sigh