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Red Line

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  • Red Line

    I am thinking of putting in a tac in my car but am wondering what red line is on my engine. the car is a 63, 170 OHV. I've figured that it is about 50 - 55 RPM. I was looking through my shop manuel last night but didn't see anything about it. Anyone know?

  • #2
    I'd set it no higher than 4800-5000 RPM with that six.

    Studebaker On The Net http://stude.com
    64 R2 4 speed Challenger (Plain Wrapper)
    63 R2 4 speed GT Hawk
    55 Speedster
    50 2R 10 truck
    JDP Maryland

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    • #3
      thanks, I'll do that.

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      • #4
        The truck version of the OHV six(1963 edition) has its max net 95 hp at 4300 rpm, max net 146 lbs.torque @ 1900 rpm. On the engine graph, the net hp and net torque lines cross at 2700 rpm.

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        • #5
          So that means what, Transtar60?

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          • #6
            You usually run up to 10% over maximum horsepower rpm. That would be 4300 plus 430 equals 4730. I would redline your tachometer at 4800 rpm.
            Gary L.
            Wappinger, NY

            SDC member since 1968
            Studebaker enthusiast much longer

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            • #7
              May we continue the discussion with information on the power range and top end RPM for a flathead 170? I don't expect it matters, but my Lark has a 4.09 rear axle and 3spd OD.

              Tom Bredehoft
              '53 Commander Coupe
              '60 Lark VI

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              • #8
                quote:Originally posted by cosmo

                So that means what, Transtar60?
                Where the torque and hp lines cross are usually the "Sweet Spot" for the engines power band.

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                • #9
                  my 6 would fall on it's arse above 4000 rpm, so use 3800 as a shift point, it likes to torque not spin.

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                  • #10
                    Thanks, Calvin, I can find 4 grand, sweet spots are elusive.

                    Tom Bredehoft
                    '53 Commander Coupe
                    '60 Lark VI

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