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Vac Advance on Dizzy

Discussion in 'Performance' started by ernst, Jan 17, 2014.

  1. ernst

    ernst New Member

    Messages:
    1
    Location:
    australia
    Can someone enlighten me why my 76 Bus /Camper does not have a vac advance on 009 Bosch Dizzy? is this normal? I have one vac line going from Idle pipe under air filter to air intake on right side and other pipe from intake to vac operated flap on intake to bypass flap on intake? Is this right,
    Cheers
     
  2. cbus

    cbus Well-Known Member

    Messages:
    13,340
    Location:
    sunshine coast
    009 dissy doesnt have vac advance , only mechanical . original vw dissy would have included vac
     
  3. Mordred

    Mordred Super Moderator Staff Member

    Messages:
    2,978
    Location:
    Penna, Hobart
    The opinion I have formed through much reading is the 009 should never be fitted on a bus. The originals had the vac advance dizzy to advance the engine under load not just engine speed. If you have a 2l try to find an original SVDA dizzy in good nick.

    Adrian
     
  4. cbus

    cbus Well-Known Member

    Messages:
    13,340
    Location:
    sunshine coast
    pretty sure there would be no vac advance under full throttle load.

    light throttle openings and particularly higher revs with light throttle. conditions of high manifold vac

    probably some as throttle opened due to existing vac . best to depress throttle steadily rather than floor it to maintain air velocity.
    high vac [and advance ] at higher [hwy] revs and light load to gain as much as poss from combustion [safely]with additional advance under safe conditions. engine should run cooler and better economy due to the idealised advance

    this applies to stock or near stock engines at least.

    certainly smoother to drive around town


    too much advance at low/mid/WOT would induce preignition.
     
  5. southozjimbob

    southozjimbob Member

    Messages:
    74
    Location:
    adelaide
    there's a port on the carb which supplies vac to the dizzy when the throttle is opened to bring on advance depending on load. without it ie: a mech advance dizzy it only depends engine speed to advance the timing. im with Mordred on this one. my girlfriend 2L had a pertronix mech advance in it and it seemed sluggish on first acceleration and had a tendency to ping on light throttle goin up hills compare to mine with a vac advance. spoke to german george when i was in newcastle and they said they are ok but you have to set the base timing higher cos the dont have as much total advance of the original svda
    the myth of the 009 gives you more profomance is exactly that...a myth.
     
  6. 1500king

    1500king Well-Known Member

    Messages:
    1,586
    Location:
    Adelaide, SA

    009's are a disgrace. We call them "Engine Killers" as they overheat and destroy engines through detonation. They are never OK, unless you have deep pockets for the repairs.
     
  7. seadog

    seadog New Member

    Messages:
    15
    Location:
    Mobile NSW/Qld
    I found the worked fine on good breathing beetle motors with suitable cams and light flywheels, that reved quickly. But not in a Kombi.
     
  8. 1500king

    1500king Well-Known Member

    Messages:
    1,586
    Location:
    Adelaide, SA
    Nope, not even in performance Type 1 motors... Detonation central.... deeper pockets!!! Too much advance too soon.


    The Bosch 010 is a perfect old distributor for those.
     

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