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Thread: 4 link dragster Q

  1. #1

    4 link dragster Q

    is it normal for a dragster to get small stress cracks around the motor mounts???? not on the main frame just on the webbing coming off the main bracket? really dont even know if there cracks or not but look like it. thanks!

  2. #2
    Senior Member RACING JUNKIE
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    Its never normal for them to get any cracks IMO but a lot do crack in them issues, some chassis builders have changed the way the mounts,limitrs are braced to fix this issue now.
    David Lanning
    IHRA NHRA 387B

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  3. #3
    Senior Member RACING JUNKIE
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    Common.. No. Does it happen..Yes. Motor plates crack, the chassis mounts crack and the uprights crack. Even with a 4-link there is a lot of stress on the welds on a car. You should exam your car regularly at the motor plate, motor mount, engine limiter, 4-link area and uprights for signs of stress or cracks.
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  4. #4
    Senior Member RACING JUNKIE
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    Jan 2012
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    Depending upon the age of the chassis, the engine you use and the size of tire, it's not "Un-Common" . . Big tires, and tire shake are chassis killers. Left side of the top tube from the front motor mount back to the rear end housing mounting plates can (and do) crack. The welds at the uprights and top tube are particularily vulnerable if you're shaking the tires at all.

    And tire shake is something a lot of guys running the Super Comp combination (Big engine, lots of torque, trans brake) don't notice because while it's brief, it's still there . . and it's a chassis killer. IF . . you rattle the tires so hard (once inna while it happens) that it bounces your head around in the roll cage, give it a good hard look before the next time out . .

    So, if you're showing cracking around the gussets, look at the main elements really hard, and if it's a continuing problem, remove all paint from that section, wipe it down with "Gibb's Oil" and check it often . .


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