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Need A New Vacuum Source For My Brake Servo


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#1 Granmas_car

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Posted 03 December 2010 - 08:14 PM

Model: metro 1.8 k series to be transplanted into a classic mini
[b]Year: unknown
[b]Description of problem: loss of standard break vacuum

Hi I’m after some advice from people more knowledgeable than me I am in the middle of building my k series engine to transplant into my mini but there are a couple of parts I’m looking for a electric vacuum pump as i lost my vacuum feed for the break servo when I put my exige throttle bodies on. If anybody knows where i can get one id greatly appreciate it
On the plus side thoe i have 180bhp at the wheels with a gearbox form a 1.4 role on mitp 2011


[b]Any non-standard parts that might be involved with the problem?
exige throttle bodies

thanks for any help and advice

#2 pikey7

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Posted 03 December 2010 - 08:31 PM

where does it come from on an exige/elise?

#3 Granmas_car

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Posted 03 December 2010 - 08:51 PM

on a standard Elise it comes of the injection rail which I no longer use as I canablized it to fit my upgrades I don’t know where it comes from on an exige as i have never seen one but im still looking into it

#4 Yoda

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Posted 04 December 2010 - 07:45 AM

I could be wrong, but i seem to recall that some Sherpa/LDV vans had a belt driven vacuum pump for the servo. Might be worth looking into?

#5 Guess-Works.com

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Posted 04 December 2010 - 11:05 AM

Well you must have some form of inlet manifold, unless you're using a throttle body for each port...

However, ask yourself, do you actually need a servo ???

#6 ibrooks

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Posted 04 December 2010 - 12:13 PM

Most diesels use a belt driven vacuum pump.

Would be far easier though to ditch the servo and run a non-servo master cylinder or possibly a pair on a bias bar pedal box.

Iain

#7 Granmas_car

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Posted 04 December 2010 - 03:36 PM

yeah im running individual tbs but im tempted to take them off and get a engineering company to put a feed in I don't think i will lose any power as the only time it will draw a vacuum is when im breaking i dont really want to change the breaks about two much as they work fairly well at 130mph decisions decisions

#8 Ethel

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Posted 04 December 2010 - 03:59 PM

No air will flow when you brake, the vacuum connection only pulls air out of the servo until the depression matches that in the manifold. When you apply the brakes you seal off the vacuum connection to the manifold and open the backside of the servo's diaphragm to atmosphere. Fitting a manifold connection seems the best option, it should build a vacuum in the servo faster than a dinky little belt driven pump could - I guess you're likely to use your brakes more frequently than someone trundling around in an old diesel :P

#9 Granmas_car

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Posted 04 December 2010 - 04:06 PM

i found a electric kit designed for motorbike powered kit cars and classics not sure if I can post the link thoe not sure of the forum rules

#10 Ethel

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Posted 04 December 2010 - 04:11 PM

Yes you can - I expect it would work, but probably not keep up with a mech pump, or simple manifold connection.

A pic of the throttle bodies would be nice - are they alloy, thick enough to tap a thread in?

#11 Granmas_car

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Posted 04 December 2010 - 04:15 PM

yeah that's what i am unsure of i don't want to have no breaks after the quarter mile i overshot the 1st exit last time at the pod

here's the link

http://www.simtekuk....uk/info.php?p=8

thanks again for any advice




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