Vacume pump
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Thread: Vacume pump

  1. #1
    Dragging not Bragging vince-305's Avatar
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    Vacume pump

    Im wondering if the vac pump (that fits on the alternater) off a diesel would work for the brake servo on a petrol
    Bit'z 'N' Piece's
    Ford consul mk2 chevy powered highrider

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    Rods 'n' Sods Junkie 100ev8's Avatar
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    i think old peugeot diesel's had a belt driven one that had a fair bit sucki sucki

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    My name is Martin 30psi's Avatar
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    Yeah it would work, but why use that when you already have a vacuum source

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    Official RnS Addict chris's Avatar
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    he's got idle hands i reckon and just wants to 'fiddle'

    unless he's found a big ole supercharger............ ?
    Last edited by chris; 22-12-2009 at 10:31.

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    Off the Xmas card list kapri's Avatar
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    I reckon he's just concerned about lack of vacuum from a wild cam ? Most of those pumps require an external oil supply as well Vince.

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    My name is Martin 30psi's Avatar
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    I had an engine with a lack of vacuum from a wild cam on one of my old cars. It only was an issue when manoeuvring the car at idle say in a carpark or something. A blip of the throttle saw the servo get regenerated.

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    Off the Xmas card list kapri's Avatar
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    On autos it can play havoc if you are still running a vacuum modulator on the gearbox though. Even some modern cars run electrical vacuum supplement pumps due to problems with cam timing , Volvo V and S range.

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    My name is Martin 30psi's Avatar
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    Yeah thats a point, mine was a manual, but the current car is an auto with a vacuum modulator. Be interested to know more about those Volvo's having additional pumps, you'd expect the cam timing not to be an issue, unless it's something to do with ridiculous emissions piping cocking it all up. Have you noticed though how some modern cars have really powerful servo assistance, perhaps they just want the brakes to be as light as possible.

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    Off the Xmas card list kapri's Avatar
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    On the V and S series it is to do with the VVT set up . My understanding is that at initial start up and runing the engine produces insufficient vacuum to work the brakes.

    Volvo also used them on the 760Turbo series , after some research they are an AC Delco unit used on some Cavaliers in the States also available new frm MP Brakes.

    Some info about on them on electric vehicle sites where they need an electric pump to run the servo assist .

    I have to agree about a lot of modern stuff being horribly over assisted.

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    Some '60s GM muscle cars had the option of non-servo disc brakes. A buddy ran these on a '67 automatic Firebird and said they worked quite well. If lack of vacuum is the problem one of these non power master cylinders might be an easier fix.

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