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Home > Help Needed / General Tech Chat > Adjustable Dump Valve

davvy1uk

31 Posts
Member #: 330
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Aberdeenshire

14th Jul, 2005 at 09:25:47am

Hopefully someone can help me. I have acquired an adjustable piston type dump valve and was wondering how to set it up. It came with a spare stonger spring and screw down rod with locknut to adjust the preload but I have absolutely no idea how I should be going about setting it up. I have a modified plenum and I know the top connection goes to the inlet manifold or anywhere downstream of the carb butterfly but that?s the end of my knowledge. Any help much appreciated.
Cheers
Dave


BENROSS

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9812 Posts
Member #: 332
Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

14th Jul, 2005 at 10:50:23am

adjustable ???

set the pre load so as the valve is fully open when the engine is on vacume
then when theres no vacume under boost this should be shut !

its made adjustable for diffrent engine vacumes






davvy1uk

31 Posts
Member #: 330
Member

Aberdeenshire

14th Jul, 2005 at 11:20:21am

Cheers Ben. When you say vacuum you mean at idle? Please pardon my ignorance on this but the dump valve came into my possesion too cheap to turn down.
Dave

BENROSS

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9812 Posts
Member #: 332
Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

14th Jul, 2005 at 12:23:27pm

idle yes

davvy1uk

31 Posts
Member #: 330
Member

Aberdeenshire

18th Jul, 2005 at 12:57:04pm

Been having a wee think about this. Does all that mean that the dump valve is fully open when the engine is idling? If so is that in effect bypassing the air filter when on idle?

wil_h

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9258 Posts
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Post Whore

Betwix Harrogate and York

18th Jul, 2005 at 02:53:19pm

yes.

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.


davvy1uk

31 Posts
Member #: 330
Member

Aberdeenshire

18th Jul, 2005 at 03:16:51pm

Cheers. Thanks for your help lads.
Dave
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