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  1. NormPeterson

    Rim tire leak repair

    Do you remember paying attention to where those wheels were leaking back then? Bead seat solutions aren't going to be of much help if the barrel of the wheel is porous. Norm
  2. NormPeterson

    Suspension dynamics after changing spring length

    Something sounds off with that. Two actions that each increase the spring rate won't compensate for each other. Are you perhaps thinking about maintaining the same final position in bump from some given inertial input instead? Of course, there's still the pesky matter of displacement input...
  3. NormPeterson

    Torque on Wheel Studs

    This, though the miles driven might vary a bit. Which reminds me, I should retorque the lug nuts on the car I recently swapped the "3-season" tires off of for the cold weather set. Virtual little pink star for that, snook. Norm
  4. NormPeterson

    From a strictly mechanical point of

    That's in the ballpark, at least with respect to what the Navy publicly admits to. https://www.naval-technology.com/projects/nimitz/ 50 years ago, I was working on the Nimitz itself (shock grade equipment foundations, mostly) and I'm pretty sure I saw some SHP numbers at the time. Filed these...
  5. NormPeterson

    From a strictly mechanical point of

    Suddenly-applied loading? U-joint angularity? Norm
  6. NormPeterson

    Designing

    Hmmmm . . . not sure how that relates to transmission / driveline engineering. Or why a google link is necessary. Norm
  7. NormPeterson

    Helper spring ?

    So how would the basic problem here be any different at the aftermarket level than it would be for the OEMs? The soft region needs to be really soft so that it doesn't materially affect ride height. The only real difference I'm hearing is that the company making this kit wants to offer a range...
  8. NormPeterson

    Tire size vs traction

    RRiver - I suspect that most people in the 1950's and 1960's got their drag racing "book learning" from the illustrated pages of Hot Rod Magazine and similar magazine titles without ever being aware that more scholarly information existed. We didn't have Google back then to help find it anyway...
  9. NormPeterson

    Tire size vs traction

    Tire unit contact pressures are far from uniform over the entire contact patch even before realizing that tread features like grooves can't support any load at all, and tread block flexibility likely ruins any notion of linearity on a local level. Norm
  10. NormPeterson

    Polyurethane front control arm bushings.

    That may be the way Nola and the rest designed their bushings, but that doesn't make it a good design overall for the application. In any event, wheel rates are best attended to via the suspension's springs and sta-bars, not the control arm bushings. With OE rubber bushings, some added wheel...
  11. NormPeterson

    Polyurethane front control arm bushings.

    Greg - OP is specifically talking about a fairly serious drag racing situation where the traction load should be generating somewhat larger lateral loads on the NVH bushing than would be experienced in the car's original purpose as a street-driven entry-level to mid-level family sedan. I...
  12. NormPeterson

    Polyurethane front control arm bushings.

    What you're doing there is bad on two accounts. First, you're exaggerating the amount of over-constraint, which the chassis brackets don't particularly like when there's any off-axis rotation, or when pairs of chassis-side sleeve axes are parallel but not concentric. And second, you're...
  13. NormPeterson

    Danger of no sway bar

    You should probably consider Ford's inclusion of a sta-bar as being their comfortable ride design. Had they not included the bar and compensated for its absence with sufficiently firmer front springs (and firmer dampers to control them), people would really be complaining about ride quality. Norm
  14. NormPeterson

    Select Coilover Spring Rate by Available Wheel Bump Load = Peak Braking/Acceleration Load?

    I would think a spring angle (squared) effect would also be involved in the motion ratio, and I think that referencing spring angle to the vertical and using the cosine makes more sense because it's a vertical effect we're looking for here. Squared because the spring force has to be greater...
  15. NormPeterson

    Select Coilover Spring Rate by Available Wheel Bump Load = Peak Braking/Acceleration Load?

    Perhaps you should consider some sort of displacement input at the tire contact patch(es) in addition to these inertial force-transfer effects from the sprung mass side . . . Norm.
  16. NormPeterson

    Roll center migration

    I suspect that lateral RC migration is really an indication of something as opposed to an end in and of itself. If the RC isn't moving very far, that means the inclinations of the force lines from the contact patches to the FVICs can't be varying much. Which sounds to me that the anti-roll and...
  17. NormPeterson

    rear indipendent suspension caster

    As in early/prototype examples of that Shogun creation before somebody figured out what was going on. Norm
  18. NormPeterson

    Tire vertical stiffnes

    Structurally, tire vertical stiffness is a spring in series with the suspension (taken as a spring/collection of springs). Mechanical grip as a function of inflation pressure is a separate matter. Norm
  19. NormPeterson

    Roll center migration

    You may be asking too much from static-only analyses. I'm coming up on 8 years retired, and I remember that certain types of analysis in my career were best handled by time history methods. Even if the analyses themselves between what I did and what you're trying to do now are different, the...
  20. NormPeterson

    Roll center migration

    In other words, this really needs to be looked at using a time history approach rather than 'before' and 'after' snapshots. Norm

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