Dumb bell solid lifters

Discussion in 'Small Block Mopar Engine' started by Retroboy, Sep 10, 2018.

  1. Retroboy

    Retroboy Well-Known Member

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    hey
     
    Last edited: Sep 10, 2018
  2. Dana67Dart

    Dana67Dart Most undignified way to get to Colorado!

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    Now this is a cryptic post. :lol:
     
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    • Retroboy

      Retroboy Well-Known Member

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      Sorry. Wanting to convert a 360 to solids. Early Dumb bell style will uncover the oil gallerys I assume?
       
    • Dana67Dart

      Dana67Dart Most undignified way to get to Colorado!

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      Did the solid lifter become shaped like a dumb bell????

      Are solid lifters lacking intelligence (certainly not as smart as hydraulic lifters that can figure out how much gap to take up) there by being dumb bells?

      Inquiring minds what to know!
       
    • SGBARRACUDA

      SGBARRACUDA ROY FABO Gold Member

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    • pishta

      pishta I know I'm right....

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      depends on the lift, or rather the "sink" of the lifter as all LA's lift is based on base circle. Stock 64 273 pictured... lifter.jpg lifter2.jpg
       
      Last edited: Sep 10, 2018
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      • Retroboy

        Retroboy Well-Known Member

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        Thanks Pishta. I've been pondering your drawing. The oil gallery is about .600" down the lifter boss so the gallery is exposed to the cut out any time the lifter isn't riding on the lobe and at that point some oil must slosh around the lifter body. I've looked at a standard factory cam which measures a base circle of 1.34, a Racer Brown ST21 with a base circle of 1.21 and a Lunati hyd Voo Doo at 1.19". I also measured a standard hyd lifter at 1.89 and a Rhoads lifter at 1.89".

        So we have a maximum difference of .060" lifter height between the generic hyd and 273 Dumbells - big deal. The maximum difference between the smallest base circle (the Voodoo) and the dumb bell lifter height is around .150" so really it should work. The next step is to buy the Comp Cams Magnum 20-248-4 solid cam and a dumb bell and physically have a look. If the lifter doesn't allow the oil gallery to be exposed and it sits a little deeper the the lifter boss that will also help with the push rod angle.
        Cheers
         
        Last edited: Sep 13, 2018
      • pishta

        pishta I know I'm right....

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        the aftermarket cams also spec a longer pushrod as every one I've seen sold for the mechanical valvetrain is longer than the stocker. Makes sense as they all have a lower base circle. I have heard the myth that the dumb-bell lifters will window the oil galley too on a high lift cam. Im thinking the 273/2 cam had a lobe lift of .405 (ex) so the lifter bore is going to be .499 above the base circle: (.270+.229 rust band)~ .405/1.5=.270 lift at cam. So theoretically the max lift (drop) of a dumb-bell lifter ON A 273/2 BASE CIRCLE is .290 or .435 valve lift which is shorter than every factory 4bbl cam ('cept the 273/4), all hydraulic.. Maybe no myth? I dont know the base circle of a 273/2 cam though, is it really 1.34? so we can do some more math.....LA cam bearing Id is about 1.956 (smallest one lobe has to go through, #4). so any lift you have is going to drop the base that much / 1.5 (rocker ratio). Lunati at a 1.19 base circle has a max lobe lift of .383 or a .574 lift.
         
        Last edited: Sep 13, 2018
      • pishta

        pishta I know I'm right....

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        somewhere I see a .551 (.780 lower band minus .229 rust area) as the max lobe lift (.826 at valve!!) a dumbell can do without exposing the oil band...? Im spinning.....Yeesh, this should be called Motor math...
         
      • RustyRatRod

        RustyRatRod Just another dumbass. Technical Editor

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        Custom pushrods. Problem solved.
         
      • j par

        j par Well-hung Member

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        The opposite of a barrel lifter?
         
      • AJ/FormS

        AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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        Jus asking, but the 284/484 is a hydro right?; will the ramps on it survive with running solids on them?

        I did run the solids on a 1973 teener cam, no problem, but that is a different story.
         
      • Wyrmrider

        Wyrmrider Well-Known Member

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        I would not run solids on a 284/484 hydro cam but the intensity is low enough you could get away with it
        but why
        It's not like running a class with a "stock" cam rule
         
      • Retroboy

        Retroboy Well-Known Member

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        No it's a solid lifter camshaft
         
      • AJ/FormS

        AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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        Oh yeah post #7 I missed it,sorry