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  1. pontiacjack

    [Im]balance of inline four cylinder engines

    Ground rule: restrict this discussion to pure 'balance' (F=ma) forces; assume no combustion occurs. Assume a "normal" crank with center two throws aligned and end throws aligned with each other, but 180 degrees from center throws. From reading various explanations of the "inherent imbalance" of...
  2. pontiacjack

    Cam bearing material

    I'm in the early stages of design/fabrication of a DOHC conversion to a hemi head (previously pushrod). Each cam will ride in five machined-from-billet "pillow blocks". Is there any reason not to use the "native" aluminum alloy of these blocks (probably 7075-T6) as the bearing surface for the...
  3. pontiacjack

    Tappet anti-rotation scheme

    I hope I'm not violating a forums rule by posting "just for fun"? This ia an Iskenderian Cams ad from Mar '58. Although I usually enjoy puzzles, I'm at a loss to visualize "automatic, self-locking keys" that require merely "dropping the lifters into place". These ads didn't run long- way less...
  4. pontiacjack

    Floating bearings

    What was (were) the perceived advantage(s) of full-floating insert-type plain bearings in connecting rods of high performance engines? I ask this past-tense because the last time I saw them advertised (by Potvin, Moon, Fobert, and maybe others) was about 1957. They were available for...
  5. pontiacjack

    Elastic modulus of wire rope

    This question is automotive-related only because I'm working on a trailer that will haul a race car. I don't have an M.E. degree and I couldn't find the answer in Machinery's Handbook. I need a ballpark value of modulus of elasticity (in tension, of course!) of a cable of 1/2" diameter, 6 x...
  6. pontiacjack

    Roots blowers- maximum speeds

    Hi. I'm new to this particular forum, and hoping for some guidance on a project that's in the early planning (dreaming?) stage. I bought a proven "lakes" race car (belly-tank lakester) and will be building a blown-alky four cylinder hemi engine for it (182 c.i. for class-F, where the SCTA...
  7. pontiacjack

    Vehicle frame in torsion

    Hello all. I usually lurk on the vehicle-driveline forum, but came over here to ask about torsional rigidity (or lack thereof!) of vehicle frames. Here's why: I'm totally rebuilding my '59 GMC pickup and was alarmed to discover (accidentally) that the chassis (no cab or bed yet mounted) has very...
  8. pontiacjack

    Universal joints

    I need a "primer" on u-joints. I don't even know the nomenclature for a typical cross-type automotive u-joint (steel cross with four needle bearings)? And I've never seen (or tried to derive) the math (output angular position vs. input as a function of running-angles, etc.). For a two-joint...
  9. pontiacjack

    dual-clutch transmissions

    I've only recently been reading about DCTs, and wonder about a couple of things. 1) In a high-performance car (say one that uses the Getrag that will live with more than 500 ft.lb. of engine torque), what is a typical limit value of clutch engagement speed from vehicle standstill? Does sudden...
  10. pontiacjack

    Tapered needles?

    This isn't actually a driveline question, but it concerns roller-element bearings, so I'm guessing that members of this forum have the appropriate expertise. Nor is it a "need to know" question- just trying to learn something. An ad for Crower's latest roller lifters mentions "polished and...
  11. pontiacjack

    sprag clutch

    Hi- new member here. After stumbling across these forums and some very illuminating discussion of silent-chain drives, I figured I'd better join to get help with other questions. I have an application for a sprag clutch, but never employed one before. From application data, I had selected a...

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