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BBB oil pressure dropping

Discussion in 'Race 400/430/455' started by 71bskylarkk, Mar 21, 2021.

Page 3 of 3
  1. Max Damage

    Max Damage I'm working on it!

    Because it seems to have pressure even on a hot start, I am also in the drain back issue camp.

    I wouldn't go crazy changing and adding things. Troubleshoot what you have first?

    Lots of smart/experienced people here. Listen to them ;~)
     
    Max Damage, Mar 23, 2021
    #41
  2. BUICKRAT

    BUICKRAT Got any treats?

    Wouldn't hurt to pressure test the oil pump feed galley (from pickup tube to pump). I believe I saw on the site somewhere where someone had opened up the galley and it ended up sucking air...
     
    BUICKRAT, Mar 23, 2021
    #42
  3. Briz

    Briz Founders Club Member

    No matter what you find in the bottom end I'd make some mods for better drainage on the valley
     
    Briz, Mar 23, 2021
    #43
    71bskylarkk likes this.
  4. Jim Weise

    Jim Weise EFI/DIS 482

    No, only too small is an issue on the line.. gauge reading is strange.. not sure I trust it.

    JW
     
    Jim Weise, Mar 23, 2021
    #44
    Max Damage likes this.
  5. 12lives

    12lives Control the controllable, let the rest go

    Someone's been busy with the water transfers - looks good! Back to the issue at hand.
     
    12lives, Mar 23, 2021
    #45
  6. 71bskylarkk

    71bskylarkk Vroom Vroom.

    Update: tore everything apart, didn't find anything out of the ordinary.

    Changed rod bearings to .001 tighter clearance, re used mains, crank was fine.

    Added more drainback holes, and went to TA scavenger pump housing with external pickup, put it all back together, annnnnnnddd STILL had the same issue but wasn't nearly as bad.

    I called TA and spoke to Tim, as soon as I mentioned the crossover line he mentioned I should just cap that off, and they don't do it, ever.

    5 minutes later I had it capped off, pressure was about 10 lbs higher across the board and doesn't drop off anymore.
    I had the same mod on my other engine, and never did it. No idea, but it fixed it and I'm not questioning anything lol.

    Thanks for all the replies and info and thoughts. Greatly appreciated. Posting my dyno vid/numbers up Tonight.
     
    71bskylarkk, Apr 19, 2021
    #46
    Mark Demko and TheEternalDance like this.
  7. 12lives

    12lives Control the controllable, let the rest go

    Great!
     
    12lives, Apr 20, 2021
    #47
  8. Mark Demko

    Mark Demko Well-Known Member

    Good news, appreciate the update:cool:
     
    Mark Demko, Apr 20, 2021
    #48
  9. Mark Demko

    Mark Demko Well-Known Member

    Yah get me thinking now why it made a difference.
    Im theorizing when the rear galleys (lifter) are looped (connected) it allows the right galley which feeds the mains, another huge area (left galley) to bleed pressure.
    Putting the allen plug back in isolates the right galley from the left and allows the right galley to build pressure easier, instead of the left galley trying to drain it (lifter bores)
     
    Mark Demko, Apr 20, 2021
    #49
    71bskylarkk likes this.
  10. gymracer01

    gymracer01 Well-Known Member

    I had this same thing with a filled valley. Cost an engine after 2 passes.
     
    gymracer01, May 12, 2021
    #50
    Mark Demko likes this.
  11. m louk

    m louk Well-Known Member

    Way back I had a buick engineer tell me to tie the galleys together to help drop oil pressure. I had high oil pressure. Never did the the suggestion as other problems had developed.
     
    m louk, May 12, 2021
    #51
    Mark Demko and gus455 like this.
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