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  1. MoreWing

    Cavitation/Foaming Vs Viscosity

    There's many different paths to the same point. From what I've found, limited cavitation hasn't been an overall detriment. It depends on when and where the cavitation is occuring, but over high frequency bumps, I've found it to help things rather than hurt them. Yes, it does act as a series...
  2. MoreWing

    Cavitation/Foaming Vs Viscosity

    Well, I don't know if you could say the absolute pressure falls to zero. That's over-stating it to some extent. The pressure only has to go below the vapor pressure for whatever temperature you're operating at. A lighter fluid will produce less of a pressure differential across the piston for...
  3. MoreWing

    Kingpin Inclination, Caster, etc. for McPherson strut

    I'm a fan of all things in moderation. I think there is a place for KPI, scrub radius, caster, mechanical trail, etc. The balance between KPI and caster is touchy, but I think in a lot of cars it comes down to the camber while steered. KPI tends to add positive camber to the laden tire while...
  4. MoreWing

    How to locate the mass centroid axis ?

    a good C.G. measurement and the associated moments of inertia will get you what you want to know
  5. MoreWing

    How to locate the mass centroid axis ?

    Listen to Greg. You're snipe hunting. The mass centroid axis is a folly that Carroll Smith popularized on racecars, I think in Tune to Win. While I have a huge amount of respect for his work, the old man was just plain wrong on this one. Depending on what you are using it for, a good C.G...
  6. MoreWing

    Clamping Shim OD

    mburgess, Crazy thing. I wrote damn near the exact same thing and posted it. For some reason it didn't show up. You covered it anyhow.
  7. MoreWing

    NEW MUSTANG REAR SUSPENSION

    Good picture STE. I think you actually kinda hit the nail on the head. They're real good at making tires bald. I've no real doubt that the trailing arm layout was a compromise between 'better that the awful thing we've been selling for the last 25 years' and $$$. At best a Mustang is about...
  8. MoreWing

    Shim stack arrangement source material

    I just grabbed my Ohlins manual. It looks like the problem was that I was mis-quoting them. Hey, I said I had slept since I last read the book, give me a break. Here's the example it gives. How many 0.15mm shims to make the same force as a single 0.30mm shim? (0.30 / 0.15)^3 = 8 It takes...
  9. MoreWing

    Shim stack arrangement source material

    In back to back tests, I've always leaned towards the big stack of thin shims. Drivers seem to use the words, 'progressive' and 'smooth' when giving feedback. I think that STE's 'digital' comment is spot on. I don't try to prop the car up with the shocks, that's just not how I approach it...
  10. MoreWing

    Shim stack arrangement source material

    Hey STE, I'm going to both agree and disagree with you. I'm fairly sure the Ohlins manual says that it takes something like 7 0.15mm shims to equal the stiffness of 1 0.30mm shim. I've slept since I read that book, so all bets are off. Getting a certain damper curve is a highly subjective...
  11. MoreWing

    SPRING FREQUENCY

    Can we give brother Rick an amen? AMEN!
  12. MoreWing

    Shim stack arrangement source material

    I know I've looked for the same thing, but not had much success. There is one thing I've found. http://www.shimprogram.com/index.php This guy, Kevin, has written a program to compare relative stiffnesses of 2 different shim stacks. It's interesting, but not really in depth enough for me to...
  13. MoreWing

    Comments on: RevoKnuckle

    I've only played with scrub radius by itself once on a car, and that was with hub spacers. We were going for track width, but we were getting it essentially with wheel offset. A 10mm change didn't change the steering effort at all. It didn't seem to affect handling either. I think we had...
  14. MoreWing

    Comments on: RevoKnuckle

    Thank you. I thought exactly the same thing! I remembered it being used on an Audi in the DTM. I even ran around the 'net a little to try to find it, but gave up. I think the change in KPI is a pretty big gain for a performance car. When you put a wide tire and a lot of camber on a...
  15. MoreWing

    Definition of Anti Squat

    Lord, I'm a glutton. Greg, What are the ranges of A.S. that you have measured? Any ideas why the designers chose these values? While I agree there is no 'hand-waving' involved, there are a series of compromises when designing nearly anything. It would be intersting to see the...
  16. MoreWing

    Definition of Anti Squat

    From BillyShope, "When empirical evidence appears to contradict the information in books, he knows that either his observations are incorrect or that he has incorrectly applied the scientific information found in the books. He would be choosing to reject the principles upon which his profession...
  17. MoreWing

    Clamping Shim OD

    Just looking at the stack you've laid out, I think you might have too little low speed. With no preload and a large step from the sealing to the next shim, it will crack off the piston port very easily, even with 3 sealers. Uncovering the port even 0.05mm will allow a lot of oil to flow...
  18. MoreWing

    Definition of Anti Squat

    Billy, It's easy to come across wrong on the internet. Please understand this is not a flame, but a series of calm statements. 1. Please change 'know' to 'now'. There doesn't seem to be an edit function for posts. The reason that I pointed the loads out is to show that suspension links do...
  19. MoreWing

    Definition of Anti Squat

    Since parallel lines meet at infinity, this would mean 100% anti-squat. This also means that all inertial loads, transmitted back through the links, are at the same angle. Any additional load, parallel to the Z axis and received at the tire patch, would require a change in spring loading, since...
  20. MoreWing

    Definition of Anti Squat

    OK, Warps and I are on agree on this one. Let's put some numbers on it and maybe I can explain my point. From Greg's long. load transfer (I hate the term weight transfer) equation let's say we have a 3000# car with a 110 inch wheelbase and a 24 CG height. It's accelerating at 0.5 G. We...

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