vacuum advance / dual carbs
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  1. #1
    Official RnS Addict 45bobber's Avatar
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    vacuum advance / dual carbs

    hi,
    if fitting single barrel twin carbs do you take a pipe to the vacuum advance from both the carbs, or just one and block the other off.
    thanks for any help
    steve

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    Official RnS Addict cozmic's Avatar
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    If your taking the vacuum from the manifold you can use a single pipe otherwise either, if its for the distributor vacuum advance unit as long as both carbs are the same and jetted and set up the same then a single feed from either should still be fine, after all its the engine / ignition that makes the vacuum. Hope that helps

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    Official RnS Addict 45bobber's Avatar
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    Quote Originally Posted by cozmic View Post
    If your taking the vacuum from the manifold you can use a single pipe otherwise either, if its for the distributor vacuum advance unit as long as both carbs are the same and jetted and set up the same then a single feed from either should still be fine, after all its the engine / ignition that makes the vacuum. Hope that helps
    thanks cozmic
    it is for the distributor vacuum advance, and is coming off the carb, there is one on the manifold that goes to the wipers,
    thanks
    again

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    Official RnS Addict cozmic's Avatar
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    Your welcome hope it helps

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    if it was me I think I would block of the vacume advance. are you using any other mods? camshaft etc??

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    Official RnS Addict scooder's Avatar
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    Quote Originally Posted by Pistonpusher View Post
    if it was me I think I would block of the vacume advance. are you using any other mods? camshaft etc??
    Why? pray tell.
    Martin.

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    Modified engines are generaly set up for power, meaning that the timing is usually set to the maximum advance possible looking for the best response, adding vacume advance tends to have no advantage and often will introduce pinking. High lift cams, high compressions will only get the increase vacume even earlier adding even less value using the vacume and risking the chances of to much advance. If the engine is set up right I do not believe you will see any benefit and in most cases it will be negative.
    This is just my opinion others im sure will prefer to use it!!!!.

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    Official RnS Addict cozmic's Avatar
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    I must admit after fitting a brand new carburettor and a new electronic distributor (not a kit) on the zodiac I found the car runs much better ( pulls stronger and is more responsive ) with the vacuum advance blanked off, the company that built the distributor did say it may well run better without vacuum.

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