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  1. kitabel

    L6 crankshaft balance?

    100% of the opposing crank pin and web structure plus approximately 50% of the reciprocating rod/piston mass But, since this is exactly the method for (completely different) 90° V8.....?
  2. kitabel

    OHV rocker arm pad radius?

    I've been back and forth on this, and found not only conflicting data and answers, but strange geometric reasoning. 1. "the pad radius is the long (valve-side) lever arm length", but (if true) why are there so many shorter exceptions? 2. "the radius is the valve lift" (no reason given) 3. "as...
  3. kitabel

    Right/Left Wound Beehive Spring Mystery.

    Just a guess? Ford found that more springs could be made from the same stock, lower scrap rate, some bean-counting factor.
  4. kitabel

    L6 crankshaft balance?

    I'm trying to get a better understanding of how an L6 crankshaft is balanced (not what it does). Searches turn up nothing useful, including such gems as "in-line engines do not have balance weights" (what's that big thing opposite the pin?), and that L6 engines do not require balance factor...
  5. kitabel

    Supercharger exit port - is this a NACA duct?

    Thanks for explaining what a supercharger is. Re: "straight-lobe-profile-rotor". I see that you're not familiar with Eaton. The MP62 (and all others in the M series) have 60° helixed rotors.
  6. kitabel

    Supercharger exit port - is this a NACA duct?

    Both have same 60° helix.
  7. kitabel

    Supercharger exit port - is this a NACA duct?

    The newer Eaton MP blower no longer uses a simple triangle for a discharge port, like this shown on an older M62 But now resembles a NACA duct, like this MP62: 1. is this correct? 2. not only is the area different (perhaps smaller) and L/W ratio far different, and covers a different...
  8. kitabel

    Compression power increase

    More thoughts: http://victorylibrary.com/brit/compression.htm
  9. kitabel

    formula needed for calculating seat pressure per psi boost

    Vizard suggests intake valve area * boost * 75% added to seat pressure.
  10. kitabel

    Unable to find answer to plenum question despite search...

    Slight improvement on slot shape, use 3/8" radius on all 4 surfaces.
  11. kitabel

    Calculation For Intake runner length?

    Re: "That quote is utter rubbish. The amount of reflection back from a change in area is proportional to the ratio of the area change. As such, a pipe that terminates into the open air will have a very strong reflection." I think the author of the quote is confusing recovered energy from a...
  12. kitabel

    OHV valve train "short-side" weight?

    I've seen many comments that any reduction in tappet, pushrod or rocker short side lever weight has almost no effect on determining spring rate and RPM. This must, IMHO, be due to the amplified movement of the long-side bits (valve, collar, locks, lash cap, long lever) by the rocker ratio...
  13. kitabel

    Eccentric crankshaft engine design?

    Anyone have more info on this? http://tinyurl.com/vlgd
  14. kitabel

    Chain vs. belt drive forces?

    I'm a complete novice with drive methods. I'm attempting to drive an Eaton supercharger at about 3X speed off the clutch shell of a motorcycle. The original Eaton drive is serpentine multi-groove pulley/belt, but I have no source for a pulley larger enough to fit around the clutch (min. ID...
  15. kitabel

    Driveshaft Critical Speed calculation

    Read some comments here: http://www.markwilliams.com/Catalog/pg70.pdf
  16. kitabel

    electric supercharger

    $179. eBay electric supercharger = $ 12. boat bilge blower = free lunch.
  17. kitabel

    Different cam profiles on the same engine?

    Yes, read Vizard's Mini engine development stuff.
  18. kitabel

    Compression ratio x compression pressure

    Or read my comments here: http://victorylibrary.com/mopar/cam-tech.htm
  19. kitabel

    Engine Plenum Size Q's after days of searching....

    V6 needs more volume than V8 of same displacement, etc.
  20. kitabel

    OHV rocker pad radius?

    Is the pad radius (where it contacts the stem tip) a pure geometric shape? I've read it's a cycloid evolute curve, but can't track down attribution.

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