Bleed Valve ... Interesting Whats better question
Turbo Mini Forums

Hello you lot ...

ok for todays whats best question ...

the metro pipework looks like this

turbo ------ standard tPiece(toActuator) --------- Elect. BleedV

I have done this

turbo -------standard tPiece(toActuator) -------- ManualBleedV

I was wondering if it would be more efficient to do this

turbo ------tPiece(2 man bleed valve )-----standard tPiece(toActuator) ------- BLOCK



Does this make sense ?

as usual if I am being a Pratt

Tell me where to go !!!


Steve

Edited by b12 on 12th May, 2004.

TurboLessTosser

1) dont use a bleed valve

2)Use a MBC (seated bearing type)

3)

Turbo------MBC-------Actuator


Job done,

A MBC, cuts out wastegate creep and spiking and is more relaible then a bleed valve.

OR if you wanted to be cool buy two MBC's and a 12volt normally open pneumatic solenoid. Wire the solenoid up so when you put 12v on it it closes ie Normally open, then

---MBC (big boost)---------------
| |
| |
Turbo---------- NO-------MBC (small boost)----T----actuator

So , you set the big boost to your max psi boost and your small boost to a day to day psi boost. Put the switch to power the solenoid in the cockpit and you can drive around on low boost, and when you want to go BIG, flick the switch and youve got max boost. Having the switch NO menas if the power fails it will go automatically go onto low boost.

The first set of vertical lines should go from NO up to the MBC and the second set from the T up to the MBC

Edited by PaulM on 12th May, 2004.

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked

Cool cheers mate ..

I have a MBC that I have not used yet ... the one with the ball bearing inside ?
That only opens at a certain pressure doesnt it ?

I am going to sound a right dinkle here;

but I dont really understand how to fit it ; The bleed valve was easy; just bleed air out of the system !!

the MBC if fitted in line line like in the diagram should it only open at the preset pressure ? so basicallty the line is closed until teh pressure is reached ?

God I sound like a w@nker !!

GRIN !

TurboLessTosser

Wheres the best place to get a good mbc from?

Iian
got mine off ebay ... this is auction i won

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...MEBWN%3AIT&rd=1

TurboLessTosser

Yep MBC in line, os the actuator wont see any pressure, until the MBC gets to the pressure set by you, which then opens and relaeses that pressure immediately onto the actuator.
You usually get a faster spool up, feeling like its pulling more.

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked

Mate that sounds ok l I understand what you are saying !!!!!


The MBC has a t as well; does that just go off to atmos ?


Steve
..

Edited by b12 on 12th May, 2004.

TurboLessTosser

I had dawes devices on teh scooby which have a good name, you can order them from the us for about $40

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked

Going two stage is also good for the 1/4 mile, enabling you to launch with less boost/wheel spin

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked

ate that sounds ok l I understand what you are saying !!!!!


The MBC has a t as well; does that just go off to atmos ?


Steve

TurboLessTosser

sounds good, ill get one sorted soon.

The twin setup sounds good, nice and simple too really, not sure that i need 2 different setups on this car though, its purely for track events so cant see it needing anything less than full throttle!!

It might look like it has a tee, but it shouldnt have if its a MBC, because all the air is used to drive the actuator.

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked

Maybe its not a tee , I will check it 2nite ??
thanks mate

TurboLessTosser

basically its an inline switch for the wastegate then rather than relying on the wastegate sensor.

Either closed or open.

Clever thing really. Never really took the time to see what they were all about!

Iain,
For track day only, a single is what Id go for and save ?30 for beer :)

9 valves, 4 wheel drive, 3 cylinders, 1 turbo, which got nicked

Yep!! Sounds like a plan!

question...

rite this thing opens when boost is at a certain pressure, letting it thro to the actuator, now if you lift off, boost drops, the valve closes, but will the pressure at the actuator side of the valve not still be high?? or is there a 1 way valve to counter-act this?

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

ive just ordered one of these
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...MEBWN%3AIT&rd=1
Going to do the switch idea! Thanks for that!
Ordered a simple stsp switch from maplins.

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3

guy's these MBCs are readily available from any pneumatic parts supplier, they're called pressure relief valves. I bought mine for ?15.

got a website for them n.g.l.?

And on the 7th day........... God created turbochargers!

as i said, any pneumatic parts supplier. check out your yellow pages!!

you what! you mean ive got to look for it myself!?!?! humf! *crosses arms in disgust!*

oh, hang on ill look on yell.com, then i havent got to move from my seat!!! lol!

And on the 7th day........... God created turbochargers!

GUTTED!

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3

so, could one of these valves be fitted instead (not in the same place, I know) of the electronic metty valve that the ECU used to control so that at, say, 7psi, it opened the waste gate (standard - 4psi)????

Speedster turbo under construction

Thats what im aiming for

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3