Bruno Adustment Help

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by Dirty Deeds, Jan 26, 2019.

  1. Dirty Deeds

    Dirty Deeds New Member

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    Have a bruno in rear end dragster with Hemi. Seems soft on launch but fine on run. So after reading previous posts I have tried adjusting pressure at lock nut next to gauge at 3000 rpm but max on gauge I can get is 110 lbs? Any ideas on what could be wrong or am I adjusting wrong.
    Thanks
     
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  2. Mike Canter

    Mike Canter Top Dragster
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    Can you also lower the pressure? If that is the pressure at 3000 rpm then it is going to be real soft on launch. The lowest you should turn it according to Bruno is 150 lbs. what fluid are you using? Have you checked the filter in the pan? Could be you have a Bruno pump problem or internal leak or you could have a converter problem.
     
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  3. Dirty Deeds

    Dirty Deeds New Member

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    Thanks Mike.
    Running RedLine super lightweight ATF.
    Havent checked filter, will do that next.
    Can lower it to about 90 on gauge. Might also check gauge.
     
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  4. mogenss

    mogenss Member

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    If you are loose on the converter to flex plate clearance that will also cause a low pressure range. You can turn it up and down but not high enough. If you loosen the converter bolts so you can slide the converter back and forth you should have in the range of 0.150-0.190 in.

    Where are you in this range ?
     
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  5. Dirty Deeds

    Dirty Deeds New Member

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    I will check
     
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  6. Mike Canter

    Mike Canter Top Dragster
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    Has it always been low?
     
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  7. Dirty Deeds

    Dirty Deeds New Member

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    I bought the car complete, and have only done a few meetings with it.
    The Bruno has been out of the car after I purchased it to freshen engine but only the oil has been changed (without changing filter)
     
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  8. Dirty Deeds

    Dirty Deeds New Member

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    I measured the clearance at .115 in
     
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  9. Mike Canter

    Mike Canter Top Dragster
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    That will probably be the problem then.
     
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  10. lucky devil

    lucky devil Member

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    so the clearance is too tight at 115..... is that pushing the pump gear back .
     
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  11. Mike Canter

    Mike Canter Top Dragster
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    If I remember correctly it has to do with the position of the converter snout to holes inside the Bruno unit. And yes if the clearance is too small it can also damage the pump.
     
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  12. Dirty Deeds

    Dirty Deeds New Member

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    Thanks guys, I will remove convertor and get the mounting pads machined less .04
     
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  13. Mike Canter

    Mike Canter Top Dragster
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    Lets us know how it goes
     
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  14. mogenss

    mogenss Member

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    When you have it apart you should also measure the pump gear depth, new 0.0035 in, and double check the oil feed line for leaks and cracks in the case in the threaded areas.
     
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  15. Dirty Deeds

    Dirty Deeds New Member

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    Finally fired engine last night, and after getting enough oil in Bruno (Redline Lightweight ATF), revved to 3000 and we have 210lbs pressure!!
    Thanks for the assistance guys
     
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  16. Mike Canter

    Mike Canter Top Dragster
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    Great. Ok, now turn it down to about 150-160 and start from there
     
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