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Old 04-15-2005, 06:01   #1 (permalink)
Jon
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Defender 200 tdi Dump Valve - Whats the point?

Just a quick question...

I'm setting about extending breathers up the snorkel and sealing up
the airbox etc and came to the dump valve - whch set me thinking.

What is the point of this silly bit of rubber?? When the turbo is
sucking air the valve 'closes' and pulls air from the air inlet
(snorkel) and when you lift off and get back pressure to the turbo the
excess pressure can release through the snorkel that is not 3 feet
away?

So can I just seal it up so I havent got one anymore or am I missing
something fundemetal in my thinking.

Whilst I'm on this subject, mine isnt really that clever at sealing
itself under vaccum anyway - should I replace it or just seal it up?

Any thoughts or advice welcomed.

Thanks
Jon

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Old 04-15-2005, 08:01   #2 (permalink)
Mark
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Re: Defender 200 tdi Dump Valve - Whats the point?

Jon wrote:
> Just a quick question...
>
> I'm setting about extending breathers up the snorkel and sealing up
> the airbox etc and came to the dump valve - whch set me thinking.
>
> What is the point of this silly bit of rubber?? When the turbo is
> sucking air the valve 'closes' and pulls air from the air inlet
> (snorkel) and when you lift off and get back pressure to the turbo the
> excess pressure can release through the snorkel that is not 3 feet
> away?
>
> So can I just seal it up so I havent got one anymore or am I missing
> something fundemetal in my thinking.
>
> Whilst I'm on this subject, mine isnt really that clever at sealing
> itself under vaccum anyway - should I replace it or just seal it up?
>
> Any thoughts or advice welcomed.
>
> Thanks
> Jon
>

Isn't it supposed to allow oil and general shit to escape the intake area?

`Mark
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Old 04-15-2005, 08:01   #3 (permalink)
Jon
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Re: Defender 200 tdi Dump Valve - Whats the point?


>>

>Isn't it supposed to allow oil and general shit to escape the intake area?
>
>`Mark


This would probably be a better explanation than mine, but then it
isnt a true dump valve!?

If this is all its for I suspect it can definately be sealed up.

Jon
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Old 04-15-2005, 14:01   #4 (permalink)
Richard Brookman
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Re: Defender 200 tdi Dump Valve - Whats the point?

So Jon was, like

> Just a quick question...
>
> I'm setting about extending breathers up the snorkel and sealing up
> the airbox etc and came to the dump valve - whch set me thinking.
>
> What is the point of this silly bit of rubber?? When the turbo is
> sucking air the valve 'closes' and pulls air from the air inlet
> (snorkel) and when you lift off and get back pressure to the turbo the
> excess pressure can release through the snorkel that is not 3 feet
> away?
>
> So can I just seal it up so I havent got one anymore or am I missing
> something fundemetal in my thinking.
>
> Whilst I'm on this subject, mine isnt really that clever at sealing
> itself under vaccum anyway - should I replace it or just seal it up?
>
> Any thoughts or advice welcomed.
>
> Thanks
> Jon


Depends on the set-up on your vehicle, but on my 90 n/a it was vital. The
intake on the wingtop lets in water to the air intake, and the dump valve
allows it to drain out. Whenever I'd got it really muddy and the dump valve
got sealed by the crud, the water would accumulate and next time you turned
on the heater all the windows misted over. Quick proggle of the rubber
valve and you could see forward again. Quite important, really.

--

Rich

Pas d'elle yeux Rhone que nous


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Old 04-15-2005, 15:01   #5 (permalink)
Ian Rawlings
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Re: Defender 200 tdi Dump Valve - Whats the point?

On 2005-04-15, Jon <nospam@nospam.com> wrote:

> I'm setting about extending breathers up the snorkel and sealing up
> the airbox etc and came to the dump valve - whch set me thinking.


It's not a "dump valve" in the chavved-up nova sense, it's a water
release valve that is there to allow water to escape from the air
intake system. I think there's another one somewhere around the air
filter too.

Some people remove them when they fit a snorkel on the basis that with
a snorkel you're much less likely to get water, twigs and small
animals in the air intake system so the release valve's not needed so
much, and if anything the water release valve is more likely to let
water in than the snorkel is.

> So can I just seal it up so I havent got one anymore or am I missing
> something fundemetal in my thinking.


Seal it up, or leave it open, makes on odds really provided that
you're happy that the air intake system is reasonably water and
creature proof.

Some snorkels, e.g. the Safari one, have a box at the bottom of the
snorkel that extends below the line of the pipe leading to the air
filter, this box catches twigs and other crap that makes it through
the snorkel mouth. If yours has one of these, then even more reason
not to bother with the release valve.

For the record, the kind of dump valve I think you are talking about
(the one that kevs fit to their cars, and yes I've got one on one of
my cars) fits between the turbo and the inlet manifold, not the air
intake and the turbo. Unless you're not thinking about what I'm
thinking about.

--
For every expert, there is an equal but opposite expert
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Old 04-15-2005, 17:01   #6 (permalink)
dave
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Re: Defender 200 tdi Dump Valve - Whats the point?


>
>For the record, the kind of dump valve I think you are talking about
>(the one that kevs fit to their cars, and yes I've got one on one of
>my cars) fits between the turbo and the inlet manifold, not the air
>intake and the turbo. Unless you're not thinking about what I'm
>thinking about.



so.... can you explain what the dump valves do on KEVS car, and should
i fit one? S`pose not, as my names Andy, im 38 and drive a Landy,
but i could start a craze, all the Kevs switching to Landys, souping
them up and hanging around car parks in town centres. Low profile
GRIZZLEY CLAWS and all.



andy

ps... im serious about the dump valve explanation......
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Old 04-16-2005, 00:01   #7 (permalink)
EMB
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Re: Defender 200 tdi Dump Valve - Whats the point?

dave wrote:

> so.... can you explain what the dump valves do on KEVS car,


On a petrol engine the inlet tract is blocked by the throttle butterfly
when the throttle is closed - this causes back pressure to the turbo and
thus stops it spinning. In the case of changing up a gear this leads to
a shot flat spot of no boost as the turbo spools up when you open the
throttle again in the higher gear. The blow-off valve (dump valve)
releases this excess pressure allowing the turbo to keep spinning on an
upchange thus allowing full boost immediately without waiting for the
turbo to spool up again. It's only of any real benefit on large turbos
that suffer excessive lag.


--
EMB
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Old 04-16-2005, 02:01   #8 (permalink)
MVP
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Re: Defender 200 tdi Dump Valve - Whats the point?

On Fri, 15 Apr 2005 20:10:05 +0100, "Richard Brookman"
<newsboy@nowhere.com> wrote:

>So Jon was, like
>
>> Just a quick question...
>>
>> I'm setting about extending breathers up the snorkel and sealing up
>> the airbox etc and came to the dump valve - whch set me thinking.
>>
>> What is the point of this silly bit of rubber?? When the turbo is
>> sucking air the valve 'closes' and pulls air from the air inlet
>> (snorkel) and when you lift off and get back pressure to the turbo the
>> excess pressure can release through the snorkel that is not 3 feet
>> away?
>>
>> So can I just seal it up so I havent got one anymore or am I missing
>> something fundemetal in my thinking.
>>
>> Whilst I'm on this subject, mine isnt really that clever at sealing
>> itself under vaccum anyway - should I replace it or just seal it up?
>>
>> Any thoughts or advice welcomed.
>>
>> Thanks
>> Jon

>
>Depends on the set-up on your vehicle, but on my 90 n/a it was vital. The
>intake on the wingtop lets in water to the air intake, and the dump valve
>allows it to drain out. Whenever I'd got it really muddy and the dump valve
>got sealed by the crud, the water would accumulate and next time you turned
>on the heater all the windows misted over. Quick proggle of the rubber
>valve and you could see forward again. Quite important, really.


erm... the wingtop air intake only feeds the heater, not the engine...


Regards.
Mark.
--
_________________________________________
1984 110 CSW 2.5(na)D
(3,000 rivets flying in close formation)
www.4x4info.info
www.mvp-fine-art.co.uk
www.markvarleyphoto.co.uk
charity calendar project -
http://www.4x4info.info/calendar/
_________________________________________



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Old 04-16-2005, 02:01   #9 (permalink)
Austin Shackles
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Posts: n/a
Re: Defender 200 tdi Dump Valve - Whats the point?

On or around Sat, 16 Apr 2005 09:23:08 +0100, MVP
<mr.nice@*nospam*softhome.net> enlightened us thusly:

>On Fri, 15 Apr 2005 20:10:05 +0100, "Richard Brookman"
><newsboy@nowhere.com> wrote:
>
>>So Jon was, like
>>
>>> Just a quick question...
>>>
>>> I'm setting about extending breathers up the snorkel and sealing up
>>> the airbox etc and came to the dump valve - whch set me thinking.
>>>
>>> What is the point of this silly bit of rubber?? When the turbo is
>>> sucking air the valve 'closes' and pulls air from the air inlet
>>> (snorkel) and when you lift off and get back pressure to the turbo the
>>> excess pressure can release through the snorkel that is not 3 feet
>>> away?
>>>
>>> So can I just seal it up so I havent got one anymore or am I missing
>>> something fundemetal in my thinking.
>>>
>>> Whilst I'm on this subject, mine isnt really that clever at sealing
>>> itself under vaccum anyway - should I replace it or just seal it up?
>>>
>>> Any thoughts or advice welcomed.
>>>
>>> Thanks
>>> Jon

>>
>>Depends on the set-up on your vehicle, but on my 90 n/a it was vital. The
>>intake on the wingtop lets in water to the air intake, and the dump valve
>>allows it to drain out. Whenever I'd got it really muddy and the dump valve
>>got sealed by the crud, the water would accumulate and next time you turned
>>on the heater all the windows misted over. Quick proggle of the rubber
>>valve and you could see forward again. Quite important, really.

>
>erm... the wingtop air intake only feeds the heater, not the engine...


exactly, if it gets water in it, it'll feed wet air into your demister.
--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
"Festina Lente" (Hasten slowly) Suetonius (c.70-c.140) Augustus, 25
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Old 04-16-2005, 03:01   #10 (permalink)
MVP
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Posts: n/a
Re: Defender 200 tdi Dump Valve - Whats the point?

On Sat, 16 Apr 2005 09:37:57 +0100, Austin Shackles
<austinNOSPAM@ddol-las.net> wrote:

>On or around Sat, 16 Apr 2005 09:23:08 +0100, MVP
><mr.nice@*nospam*softhome.net> enlightened us thusly:
>
>>On Fri, 15 Apr 2005 20:10:05 +0100, "Richard Brookman"
>><newsboy@nowhere.com> wrote:
>>
>>>So Jon was, like
>>>
>>>> Just a quick question...
>>>>
>>>> I'm setting about extending breathers up the snorkel and sealing up
>>>> the airbox etc and came to the dump valve - whch set me thinking.
>>>>
>>>> What is the point of this silly bit of rubber?? When the turbo is
>>>> sucking air the valve 'closes' and pulls air from the air inlet
>>>> (snorkel) and when you lift off and get back pressure to the turbo the
>>>> excess pressure can release through the snorkel that is not 3 feet
>>>> away?
>>>>
>>>> So can I just seal it up so I havent got one anymore or am I missing
>>>> something fundemetal in my thinking.
>>>>
>>>> Whilst I'm on this subject, mine isnt really that clever at sealing
>>>> itself under vaccum anyway - should I replace it or just seal it up?
>>>>
>>>> Any thoughts or advice welcomed.
>>>>
>>>> Thanks
>>>> Jon
>>>
>>>Depends on the set-up on your vehicle, but on my 90 n/a it was vital. The
>>>intake on the wingtop lets in water to the air intake, and the dump valve
>>>allows it to drain out. Whenever I'd got it really muddy and the dump valve
>>>got sealed by the crud, the water would accumulate and next time you turned
>>>on the heater all the windows misted over. Quick proggle of the rubber
>>>valve and you could see forward again. Quite important, really.

>>
>>erm... the wingtop air intake only feeds the heater, not the engine...

>
>exactly, if it gets water in it, it'll feed wet air into your demister.


confused the crap outa me, I think 'dump valve' and I think about the
thingy in the manifold or a turbo engine rather than the little rubber
wossit in the bottom of the air filter box.
Is there such a valve in the heater box? spose there must be
considering the intake is open-upwards allowing rain straight in.
I'll piss-off now and do something useful....


Regards.
Mark.
--
_________________________________________
1984 110 CSW 2.5(na)D
(3,000 rivets flying in close formation)
www.4x4info.info
www.mvp-fine-art.co.uk
www.markvarleyphoto.co.uk
charity calendar project -
http://www.4x4info.info/calendar/
_________________________________________



.................................................................
Posted via TITANnews - Uncensored Newsgroups Access
>>>> at http://www.TitanNews.com <<<<

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