Turbo breather valve (PCV)

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triumphtoledo
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Turbo breather valve (PCV)

Post by triumphtoledo » Fri Jan 05, 2018 11:57 am

As the original part is obsolete (part no 3451221) and not very well engineered, does anyone know of alternative set-ups (not catch-cans or bodging a filter on the end of the oil strainer) that maintains satisfactory breathing through the inlet manifold and turbo inlet?

Rob

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jamescarruthers
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Re: Turbo breather valve (PCV)

Post by jamescarruthers » Fri Jan 05, 2018 4:22 pm

Yes, we have a solution. viewtopic.php?f=24&t=19542

In our how to section
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

triumphtoledo
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Re: Turbo breather valve (PCV)

Post by triumphtoledo » Fri Jan 19, 2018 10:04 pm

Thanks for this but I cant see any pictures and the crankcase breather is not a recirc valve - it's a diagram and one way valve combined - plus, my car is unmodified.

Does anyone have an alternative method? I am currently experimenting with a few set-ups...

R

jifflemon
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Re: Turbo breather valve (PCV)

Post by jifflemon » Fri Jan 19, 2018 11:04 pm

The pictures are showing for me? However, a recirc valve is just that - a one way valve. The diaphragm acts under vacuum, to open the valve.

triumphtoledo
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Re: Turbo breather valve (PCV)

Post by triumphtoledo » Sat Jan 20, 2018 12:17 am

I cannot see the pictures, sadly, as I do not have Photobucket membership. Yet, as the original part acts BOTH as a one way valve and as a calibrated restrictor under boost conditions, I fail to see how this conversion works in terms of the crankcase ventilation for an unmodified Turbo.

R

Robou
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Re: Turbo breather valve (PCV)

Post by Robou » Sat Jan 20, 2018 11:54 pm

Both valves perform the same action, they open when a difference in pressure is detected between the inlet manifold and the hose they are connected to.
This is why the recirculation valve can be used to replace the crankcase breather. But mounting it is quite a hassle because of the different diameters of the connections.
Here the pictures would have helped, but they are not necessary for this diy job.
Too old to bother
480 Turbo midst '91

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brinkie
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Re: Turbo breather valve (PCV)

Post by brinkie » Mon Jan 22, 2018 9:16 am

triumphtoledo wrote:
Sat Jan 20, 2018 12:17 am
I cannot see the pictures, sadly, as I do not have Photobucket membership.
Even a Photobucket membership won't help you, the original uploaders have to pay a ransom of $400 to release the pictures to the public.
Luckily there is a workaround, I have managed to save the pictures and have added them to the thread.
Robert.

Present cars: 1994 Volvo 480 GT 2.0i, 1999 Volvo S70 2.5 Europa, 2010 Volvo V70 2.0F Momentum

Gmac34
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Re: Turbo breather valve (PCV)

Post by Gmac34 » Mon Jan 22, 2018 9:18 am

Hi, here you can find some pictures from the Volvo service manual,
https://imgur.com/a/cMdH8
should help you understand how the valve works.
It is important to note that it's tree things in one, a non-return valve to avoid pressurising the crankcase, a diaphragm valve balanced with atmospheric pressure to avoid too much suction from the inlet (or you will be sucking oil up) and a bunch of calibrated holes to avoid pressure buildup in the crankcase when the non-return valve is closed.
I was researching this matter when I suspected mine was broken, and I was going to try to use this one

https://www.ecstuning.com/b-genuine-vol ... 6a129101d/
or a cheap chinese version maibe
https://www.aliexpress.com/item/Free-Sh ... 04668.html

plus a small non-return valve (like the metal ones for fuel lines) to go to the inlet

I was also thinking to 3d print a T junction with calibrated holes o connect it all

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