Volvo RWD 200 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 3/2002 200 INDEX

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240's have lots of DRAG. 200

posted by  runwld2 on  Sat Sep 25 11:56 CST 2010
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last visit: Tue Sep 30 13:11 CST 2014
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Just for yucks and info,
Here is the link to the page which lists many cars CD.
http://rc.opelgt.org/indexcw.php
First column is the Cd coefficient of drag, next the surface area (units unknown but suspect sq.meters), then the total drag, area times the CD.

The 240 was typical if maybe a bit less than average for its era, but the new S80s and 60s are quite svelte! (In drag, not in Kgs.)
--
84 242Ti IPD bars&springs, 89 745 16v M46 IPD bars, 89 744 16v M46 IPD bars, 93 945 Turbo AW71, 91 245SE AW70 IPD bars, 93 245 CLassic M47








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    240's have lots of DRAG. 200

    posted by  Michel on  Sun Sep 26 15:20 CST 2010
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    Cd is non-dimensional. Drag is a force. Drag= Cd*1/2*rho*V^2*A, where rho is the air density, V is velocity, and A is the frontal area.
    --
    Michel Garcia - 1986 240 B230F & 1982 240 B21A - Ottawa, Canada








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    240's have lots of DRAG. 200

    posted by  Trev29 on  Sun Sep 26 00:26 CST 2010
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    I don't know why the surface area is required. Not all surface area is the same. Drag is determined by how the surface is presented. That facing the wind provides more resistance than that which is horizontal or that at the rear which may be creating a vacuum.

    What we need is actual comparisons between vehicles in the same airflow. Push the cars with air at a certain speed. The cars that are pushed back the hardest have the worst drag.
    --
    1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.








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      240's have lots of DRAG. 200

      posted by  runwld2 on  Sun Sep 26 01:27 CST 2010
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      From Wikipedia:
      "Drag coefficient (Cd) is a commonly published rating of a car's aerodynamic smoothness, related to the shape of the car. Multiplying Cd by the car's frontal area gives an index of total drag. The result is called drag area, ... "

      The force varies with the speed of the car, and I suppose the density of the air.
      --
      84 242Ti IPD bars&springs, 89 745 16v M46 IPD bars, 89 744 16v M46 IPD bars, 93 945 Turbo AW71, 91 245SE AW70 IPD bars, 93 245 CLassic M47








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        240's have lots of DRAG. 200

        posted by  Trev29 on  Mon Sep 27 00:28 CST 2010
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        last visit: Fri Oct 17 05:56 CST 2014
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        "Multiplying Cd by the car's frontal area gives an index of total drag. The result is called drag area,"

        Yes. But I think two vehicles may have the same frontal area, but depending on how it is oriented and determined, the drag will be different. The rest of the vehicle's area also has an effect. Also the mass. (A light car will get blown off the road in a strong wind, despite it's superior Cd.)

        I would prefer real world comparisons showing how much force is deflected rather than absorbed. Actual drag rather than one obtained from a formula with variable variables. (Cd can vary if testing isn't consistent.)
        --
        1980 245 Canadian B21A with SU carb but electronic ignition and M46 trans in Brampton, Ont.








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    240's have lots of DRAG. 200

    uid 2796's pic
    posted by  bulletproof on  Sat Sep 25 14:33 CST 2010
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    Bricks, you know...
    --
    '80 DL 2 door, '89 DL Wagon








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      240's have lots of DRAG. 200

      uid 779's pic
      posted by  matt b on  Sun Sep 26 02:50 CST 2010
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      Well... could be worse.

      Only slightly worse that the likes of Lamborghini's Countach, or Ferrari' 348 spyder..

      and we can fit a lot more stuff in our cars :)
      --
      -Matt I ♥ my ♂








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        240's have lots of DRAG. 200

        posted by  weather on  Sun Sep 26 16:17 CST 2010
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        last visit: Fri Oct 26 23:16 CST 2012
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        those cars have high Cd because they are designed to create downward force at high speeds, which keeps the car planted on the pavement for better handling. this downward force however increases the resistance at the same time.

        our bricks? well, the Cd is purely because of the ungainly shape that doesn't improve the handling in any manner.







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