vacuum advance pipe needed, any ideas?
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  1. #1
    Rods 'n' Sods Junkie
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    vacuum advance pipe needed, any ideas?

    Just put a new vacuum advance unit on the pick up, now i know i had the necesary pipe and 90 degree connectors layed in the garage, but have since had a clear up!!!!, so now i need to find a supplier for a couple of 90 degree 5mm pipes for each end and the pipe to join the two together, any ideas please, andy

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    Official RnS Addict WB54's Avatar
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    any motor factors should have that.

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    Exceeded sell by date Plumpcars's Avatar
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    Or Ebay and Real Steel if you can't get to one.

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    Rods 'n' Sods Junkie
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    Thanks for that the pair of you, now got the needed pipes and joiners, got it hooked up, now, as it revs the distributor can be seen to advance, then it backs off again, if you hold it at a set rev, it will advance to get to that rev range, then fall back again, if that makes sence, am i mis understanding what this unit does, or should it advance the spark as the revs rise and hold it in an advanced position. Also seemed to not be as happy on the road as it was before it was hooked up, acelerates better, but now has a bit of a misfire on the over run.

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    Official RnS Addict mygasser's Avatar
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    the vacuum advances the timing. so as you blip the throttle the timing is retarding (opening the throttle drops the vacuum) then once you hold it at a steady rev the vacuum increases and advances it again. so your 'misfire' on the overrun is cos the timing's advanced due to the closed throttle and increased vacuum. think that all makes sense, neil.
    need a job done on your project? i may be able to help.

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    Official RnS Addict WB54's Avatar
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    vacuum advance is there to advance the timing when there is manifold vacuum present, ie when the throttle is closed. More advance at cruise will produce a more efficient burn, and therefore emit less and be more economical. All that unit does is pull on the baseplate to advance the timing by X amount. The dizzys baseplate movement is regulated by the throw out of the weights and springs centrifugal effect as RPM's rise. If you have a misfire on the overun, then it's maybe indicative of the vac advance kicking in. Check the timing at idle with the vac disconnected, sounds like you may set the initial timing with this connected ?

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    Once again, thanks for that, seems i had the wrong understanding of what the unit does , at least that puts my mind at rest, any idea what these motors should rev to, its a 292, did have it pulling strong round to 4000 in third, but its not really happy much above 3 in top,thats why i thought it was something to do with the timing not advancing, not looking to go V8 as i like the torque of the 6, anybody know much about upping the output on them?

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    Rods 'n' Sods Junkie
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    Sorry, just read that again, its a 4 speed manual!

  11. #9
    "Mr Fiddler" stevetoxic's Avatar
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    Quote Originally Posted by trukaholic View Post
    anybody know much about upping the output on them?
    Plenty of info about this, I have a as new tuning manual if you're interested - yours for £10 inc postage.
    Amazon.com: Chevrolet Inline Six-Cylinder Power Manual (9781931128155): Leo Santucci: Books

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    "Mr Fiddler" stevetoxic's Avatar
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