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suffe

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Dongen Netherlands

13th Feb, 2009 at 11:22:14pm

hi i'm from the netherlands (sorry for my bad english!) and i have a question about my plenum of my metro turbo,

on this picture you see on the right side of the plenum a hole with a spring in it, i only have a spring there, is that ok?



i hope that someone can help me with this?

best regards
Richard

Edited by suffe on 13th Feb, 2009.


Rod S

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13th Feb, 2009 at 11:59:47pm

There should also be a disc (dome, plunger...) under the spring.

When the other part is bolted on it should make a spring loaded valve (safety valve, blow-off valve, relief valve) to let excess pressure out of the plenum through the slot you see in the other part. But normally the hole is closed, it only opens with high pressure.

So under that spring there should be another part, not just a hole !!!

Schrödinger's cat - so which one am I ???

wil_h

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Betwix Harrogate and York

14th Feb, 2009 at 07:52:39am

however, most people bloc them up as they pop at 10psi. So if you want to rum over 10psi just block it.

p.s. English is perfect

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


suffe

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Dongen Netherlands

14th Feb, 2009 at 02:29:51pm

thanx for the help!
what is the best way to blok it?


Rod S

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14th Feb, 2009 at 02:51:25pm

There are several ways from a simple bung/stopper to welding it over, BUT.....

Most people block it because they are fitting a proper dump valve instead.

If you block it without fitting a dump valve, the life of the turbocharger may be reduced.

When you "lift off" (decellerate or close the throttle suddenly) there is nowhere for the compressed air to go so the turbocharger compresser stalls (stops very quickly). This is not good for its life.

Most cars have dump valves (operated by manifold vacuum sensing the throttle has closed) - this relief valve is a crude (simple) alternative working on compressor pressure rising.

You really need one or the other.

Schrödinger's cat - so which one am I ???

suffe

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Dongen Netherlands

14th Feb, 2009 at 02:56:11pm

i have a dumpvalve so that is coming good!

Rod S

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14th Feb, 2009 at 03:10:17pm


On 14th Feb, 2009 suffe said:
i have a dumpvalve so that is coming good!


Good :)

Block it like everyone else who fits a dump valve then :)

Do a search and you will see the different ways of fitting the dump valve (and blocking the old relief valve).

Schrödinger's cat - so which one am I ???

wil_h

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Betwix Harrogate and York

14th Feb, 2009 at 04:17:51pm

but this isn't a dump valve. It's a pressure release valve, pops around 10psi.

And at less than 10psi the worth of a dumpvalve is of some debate.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Rod S

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Member #: 2024
Formally Retired

Rural Suffolk

14th Feb, 2009 at 05:40:19pm


On 14th Feb, 2009 wil_h said:
but this isn't a dump valve. It's a pressure release valve, pops around 10psi.


Agreed, but from suffe's statement "i have a dumpvalve so that is coming good!" I had assumed he means that he is intending to use a normal dump valve instead (or as well as) the little relief valve ???

And at less than 10psi I agree that, theoretically, the worth of any sort of dump valve is debatable .......
but maybe not in this thread.

Schrödinger's cat - so which one am I ???

suffe

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Dongen Netherlands

15th Feb, 2009 at 12:18:27am

i stay below the 10psi so that wil no problem
thanx again for the info
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