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Who's got a varajet?

Discussion in 'VB - VK Holden Commodore (1978 - 1985)' started by 1985VK, Nov 21, 2019.

  1. 1985VK

    1985VK Well-Known Member

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    Love them or hate them. Just wondering who is using a 2 barrel varajet or even a quaddie.
    Do you have any tips and tricks to keep them running right?
     
  2. commy vk

    commy vk Active Member

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    Running a Scaryjet that come with the car from factory
    and the car is fully dedicated to lpg without too many dramas.
    Unless you are familiar with the carby it could get daunting when taking apart so take pics or recordings of each stage.

    When I still had dual fuel I took the carby apart and found the shafts had so much gap you could drive a Mack truck through.
    Off to the carby joint and bronze bushes were installed.
    The only other things that needed attention was the little filter that is behind the inlet nut which was destroyed as it had disintigrated,
    good luck trying to get 1 of those babys.
    Float level and needle and seat were replaced and the Auto choke was fixed.
    Beware of the anti dieseling solenoid cause if that is stuffed she won't start in a million years
    but only if you are still running the poxy computer huh.
    I fitted a VH dizzy so out in the trash it went.
    The mixture screws should be factory sealed so no fiddling
    There might be more but just ask away.
     
    Last edited: Nov 21, 2019
  3. shane_3800

    shane_3800 Active Member

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    I'm a technician by trade I have never worked on one and likely never will but when we get carbies in the three 50+ blokes I work with help me. The thing is I'm planing on running a street demon these guys don't know what they are. Carby diag is common sense with the right training, if you can fix a webber than you can fix a quadrajet because diag is the same even though design is different.
    I fixed the carb on my mates honda road cruiser bike the guys at work had never worked on one of these carbs. You know how I fixed it? I pulled it down and traced every circuit and found a diaphragm not working because of a blockage and it worked. initial diag was sparying cooking oil on the plunger and the bike ran perfect until the fuel washed it off. So I discovered a port that keeps fuel on the plunger to keep vaccume using a fluid seal.

    That is an example of using common sense.
     
  4. 1985VK

    1985VK Well-Known Member

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    I have screwed my varajet fuel/air mixture screw all the way in and the engine is running at 900 rpm. Trying to figure out what to look at to get it right.
     
  5. 1985VK

    1985VK Well-Known Member

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    When you opened up your carby was it junky inside or relatively clean?
     
  6. commy vk

    commy vk Active Member

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    Clean as a whistle
     
  7. commy vk

    commy vk Active Member

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    When U screw the screw in does it come to a stop when all the way in or does it keep turning?
    Have U found the idle screw? Not the choke screw.
     
  8. vc commodore

    vc commodore Well-Known Member

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    Whilst I haven't worked on a Varijet, I have had a single barrel stromberg, where you screw the mixture screw in and it doesn't bottom out....Turned out that the brass fitting that the mixture screw goes into had a thread that was nackered.....Replaced the thread and mixture screw and it bottomed out.

    Another way to tell if that thread is nackered is, while the car is running, spray some WD40/CRC/fly spray directly at the mixture screw and listen for the revs to go up. If it does, it'll be knackered and will require replacement
     
  9. vc commodore

    vc commodore Well-Known Member

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    The 50 year old fellas don't know what a street demon carb is? Surely you aren't being serious....
     
  10. shane_3800

    shane_3800 Active Member

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    They fix standard cars. We used to have a dyno 30 years ago but the big boss made the decision to get rid of it. We don't do performance upgrades. Seeing as street demons are relatively new they don't work on them. I can't remember the last carby car we had in tbh we rarely see stuff older than 2000. New eruo cars yea we have plenty we have a 2016 4cyl diesel merc in atm with noisy lifters on start up which we have to solve on top of the X-mas rush.

    We don't do perfomance because 90% of cars on the road and 99% of kilometers driven are with A to B cars which is where the money is. My big boss has more money than most at a guess his portfolio has to be more than 20 mil.
     
  11. commy vk

    commy vk Active Member

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    The single barrel Strommy was the first carb that I ever took apart and put back in my FJ and FC Holden
    Worksop manual What are they?
    You could fix a car with a bit of wire and string
    We learnt the hard way
    Yep they were the days
    Leaded petrol was all we had and it only cost $5 to fill up
    I would go down to the auto parts shop and buy a $2 sports air filter and away I'd go
     
    Last edited: Nov 23, 2019
  12. 1985VK

    1985VK Well-Known Member

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    I am referring to the larger screw (it is screwed all the way in and comes to a stop, it does not keep turning)

    It is located above the smaller screw below it.

    [​IMG]
     
  13. 1985VK

    1985VK Well-Known Member

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    I am under the impression the larger screw in the above pic is the idle screw, and about 2 and a half turns out from fully seated is roughly where the idle should be. The issue is it is fully seated and i am getting about 900 rpm at idle.

    Is it fair to suspect there is a vacuum leak somewhere?
     
  14. 1985VK

    1985VK Well-Known Member

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    Here is a better pic of the Varajet II issued with the VK model. I am using a VH carby that is very similar.

    The "idle bypass" screw is all the way in.

    [​IMG]
     
  15. commy vk

    commy vk Active Member

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    Last edited: Nov 24, 2019
  16. vc commodore

    vc commodore Well-Known Member

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    Honestly, I'm unsure which screw adjusts what.....I have a varijet on a VH here, but have had no cause to fiddle with it....However, you could spray both screws with CRC/WD40 or Flyspray and see if the revs rise......This will prove or discount those being the problem....

    I have also discovered the plastic vacuum trees on the inlet manifold do have a habit of causing vacuum leaks, due to age.....So another port of call to try
     
  17. 1985VK

    1985VK Well-Known Member

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    Somehow you quoted something i did not write and included something maybe you did not either.
     
    Last edited: Nov 23, 2019
  18. vc commodore

    vc commodore Well-Known Member

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    That's why I have older cars.....:) I enjoy the KISS system

    I was lucky enough about 5 years ago to get hold of some leaded petrol from a car that had been sitting for 30 years.....My car never ran soo good....:p

    Anyways I've reminised enough....:)
     
  19. vc commodore

    vc commodore Well-Known Member

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    Still shaking my head, that they aren't aware of street demon carbs....If my crappy memory serves me correct, they've been around for 15 years or so and I'm 99% sure, they're basically a holley carb.....

    Oh and the latest performance carbs are quick fuel carbs......From what I've heard (and I have rellies involved in the burnout scene and mates with nice streeters), they crap all over holley's and street demons....

    Don't take my word for it, do some research
     
  20. 1985VK

    1985VK Well-Known Member

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    Okay looks like the engine had a vacuum leak and was running lean through the rear manifold vac tree. Those plastic buggers are not the best. Had an interesting time looking on YouTube at how people "smoke" their engines to find vac leaks.



    Or you can use a cigar to blow smoke through your intake.

     

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