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Vacuum Advance at idle question

Discussion in 'VB - VK Holden Commodore (1978 - 1985)' started by grantius, Jan 20, 2014.

  1. the_boozer

    the_boozer no more VK

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    yes it applies vacuum only as the throttle opens oberserly once we get into lots of throttle vacuum being sucked thru the small hole doesn't happen anymore as it all goes thru the throttle butterfly. Ive t'ed into the (egr) 8mm hose stepped it down and used it as vac advance it seamed to work all right, on other cars when the distributor was recurved I didn't bothered with vac advance.
     
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  2. 1985VK

    1985VK Well-Known Member

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    Would using the EGR line be better to put water through it for water injection?
     
  3. commy vk

    commy vk Active Member

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    I'm a bit lost on the water feed bit
    Where does it come from and where does it(water)go?
     
  4. 1985VK

    1985VK Well-Known Member

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    I have a VH carby with a vacuum port. The vacuum line from the dizzy goes to that port. I also added a water drip feed from a water bottle (as an anti detonant) with a line to the carby that goes into a T piece into the vac line just before the carby. I would prefer the drip feed was separate and not shared with the vacuum line from the dizzy. I was wondering if the EGR port was a good spot for the drip feed.
     
  5. the_boozer

    the_boozer no more VK

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    if the water is to stop pinging its probably not sucking any at full throttle when it matters?
     
  6. 1985VK

    1985VK Well-Known Member

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    Thats what im trying to work out. It should feed at full throttle. It seems to work. It doesn't seem to rattle under load.

    There is also a little port on the EGR valve side at the base of the carby that seems to have vacuum all the time that might be a goer (it connects to the air pump line and has a little T in it that goes to the bottom of the air filter housing)
     
  7. commy vk

    commy vk Active Member

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    What head are U running?Is it stock or have the seats been hardened?
    A stock head will most probably always ping or sound like a diesel motor.
    An exchange head with the approprate work carried out will stop all the HFs.
    It is not that expensive.
     
  8. 1985VK

    1985VK Well-Known Member

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    Yep stock 202.
     
  9. 1985VK

    1985VK Well-Known Member

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    The car needed the dizzy adjusted for more advance today for more power. I am thinking the water is cleaning the heads up and affecting the timing? It runs better now. It loves the water feed.
     

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