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| Home > Help Needed / General Tech Chat > Is my dump valve broken? | |||||||
 774 Posts Member #: 6724 Post Whore Wootton Bassett |
3rd Jun, 2011 at 06:10:07pm
I've just fitted a bosch recirculating dump valve. I noticed today that the manifold pressure wasn't negative at idle so looking around for loose pipes. Turns out the vacuum pipe on the dump valve I the cause and it's because the dump valve is sucking past the valve. How're they built? Shouldn't the vacuum pipe connect to a diaphragm? Have I split the diaphragm? |
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 16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
3rd Jun, 2011 at 06:15:39pm
Have you got it fitted the right way round? On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it 
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
3rd Jun, 2011 at 06:33:28pm
^^^^ as above On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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774 Posts Member #: 6724 Post Whore Wootton Bassett |
3rd Jun, 2011 at 06:44:45pm
I think so. I put it so that the spring resists the high pressure side.
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 (2)[/url] by [url=https://www.flickr.com/photos/150672766@N03/]Rod Sugden[/url], on Fli) 5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
3rd Jun, 2011 at 06:45:23pm
The Bosch one is a very basic diaphragm type - diaphragm on the sensor side and simple piston on the "dump" side.
Schrödinger's cat - so which one am I ??? |
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Site Admin  15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
3rd Jun, 2011 at 08:01:42pm
On 3rd Jun, 2011 dan187 said:
I think so. I put it so that the spring resists the high pressure side. The vacuum sucks through both sides although the side I've put to atmosphere sucks the most. See my turbo build thread below for a pic of the setup. It's on the last page. The side that the boost vents to should not be under vacuum. Not sure how you have plumbed it to get this. Large bore hose stub to the flat side of piston goes to boost duct between intercooler and plenum, or off the plenum. Other large bore hose stub usually directed into the duct before turbo after air cleaner. Small bore hose goes to somewhere on inlet manifold.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
3rd Jun, 2011 at 08:32:50pm
interestingly the SAAB 9 5 has a solenoid in the vac line that is shut during cruse preventing the valve lifting On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
3rd Jun, 2011 at 09:14:13pm
found this, which might be usefull to you.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
3rd Jun, 2011 at 09:51:34pm
Found the pic in your build thread, and it looks to me that you have it plumbed in the wrong way round, but the picture does not show the flow direction well enough.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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Site Admin 15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
3rd Jun, 2011 at 10:08:24pm
On 3rd Jun, 2011 Sprocket said:
interestingly the SAAB 9 5 has a solenoid in the vac line that is shut during cruse preventing the valve lifting Why should it need this though? My logic is that on both sides of the valve you have vacuum on cruise, and on one side you also have the spring pressure holding it shut. Certainly I'm pretty sure the one on my 205 is shut on cruise, as when I've run a non-recirc type that was also shut on cruise.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
3rd Jun, 2011 at 10:16:35pm
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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774 Posts Member #: 6724 Post Whore Wootton Bassett |
3rd Jun, 2011 at 10:20:03pm
Cheers for linking i'm on my phone. The pipe you can see in it's entirety is the high pressure side. Is that not right? |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
3rd Jun, 2011 at 10:25:29pm
On 3rd Jun, 2011 Tom Fenton said:
On 3rd Jun, 2011 Sprocket said:
interestingly the SAAB 9 5 has a solenoid in the vac line that is shut during cruse preventing the valve lifting Why should it need this though? My logic is that on both sides of the valve you have vacuum on cruise, and on one side you also have the spring pressure holding it shut. Certainly I'm pretty sure the one on my 205 is shut on cruise, as when I've run a non-recirc type that was also shut on cruise. The valve shoud never be exposed to vacuum (excluding the smallest connection), if it is, there is a problem, since the vave is connected to the boost pipes before the throttle. At cruse there may well still be some 'boost' since the throtte is only partly open, and the exhaust gasses are still driving the turbo. so with a posative pressure trying to push past the piston and a vacuum acting on the diaphragm, the only thing really holding the vave shut is the spring rate. Again it depends on the valves since there are a few different types that all look identical from the outside. If you read that document I linked to, it shows graphs of the three different bosch valves he tested and the 108 is full open at a relatively low vacuum. The SAAB workshop manual clearly describes the contro of the soenoid for the 'bypass' valve at cruse On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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774 Posts Member #: 6724 Post Whore Wootton Bassett |
4th Jun, 2011 at 01:34:32pm
According to sprocket's photo I have plumbed it wrong but I'm not sure how me changing it round will solve my problem. Surely there should be no air getting in or out of the diaphragm that the vacuum pipe connects to. That's because the pipe connects post throttle. So currenty it's just like having a leak in my inlet manifold. |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
4th Jun, 2011 at 01:56:56pm
Read the document I linked to earlier! On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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 1183 Posts Member #: 6926 Post Whore Accrington |
4th Jun, 2011 at 11:00:56pm
so would you connect the pipe from the plenum DV takeoff into the one opposite the vaccume pipe on the DV? |
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 3673 Posts Member #: 9300 Post Whore Quarry Bonk |
5th Jun, 2011 at 12:14:26am
From the diagram it looks as if your recirc valve is on backwards, so any boost is pushing the piston open and going back through the system, pressurising the inlet side of things, along with said vacuum pipe. Thats my theory anyway! On 26th Jan, 2012 Tom Fenton said:
ring problems are down to wear or abuse but although annoying it isn't a show stopper On 5th Aug, 2014 madmk1 said:
Shit the bed! I had snapped the end of my shaft off!! 17.213 @ 71mph, 64bhp n/a (Old Engine) |
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1183 Posts Member #: 6926 Post Whore Accrington |
5th Jun, 2011 at 01:27:53pm
according to that disgram i have mine connected wrong, but it still works. However mine dumps to the air atm. |
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774 Posts Member #: 6724 Post Whore Wootton Bassett |
5th Jun, 2011 at 06:12:34pm
I according to the diagram mine was on backwards but i cant really see what difference it makes to the operation. Either way that's not the problem. It seems my diaphragm is split but only a little. So that if I suck on the little vacuum pipe it sucks air through the rip. But if I blow on the vacuum pipe it pushes the diaphram against tha valve wall and self seals.
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
5th Jun, 2011 at 07:11:36pm
You know how it should be plumbed and you know how you have it is wrong. You know The diaphragm is split but you are going to leve it even after asking advice as to whether it is broken?
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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774 Posts Member #: 6724 Post Whore Wootton Bassett |
5th Jun, 2011 at 09:12:56pm
Because only realised it was broken and plumbed wrong thanks to the links and comments. |
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