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  1. Lou Scannon

    Designing a cam

    That's the point. A cam profile can be scaled, within reason, to a different base circle diameter and lift, without violating the basic kinematic design intent. Definitely stay with the same type of follower originally intended, and scale the follower (and lash, if relevant) in accordance with...
  2. Lou Scannon

    Designing a cam

    Any chance of putting valve or cam lift in a plot like the top right? I think that's the format we engine types are most used to and able to evaluate.
  3. Lou Scannon

    Designing a cam

    Maybe to help us visualize, you could post your valve lift curves, dimensioned and indexed to TDC, but to scale is optional.
  4. Lou Scannon

    balance question

    That was the text I had in uni 40 years ago. I guess physics hasn't changed much in the meantime.
  5. Lou Scannon

    balance question

    The V16s I'm familiar with have firing orders like two inline 8s offset by 45 degrees. Inline 8s are setup with a 4 cylinder arrangement of the centre 4 cylinders, and the outer 4 cylinders set up like a 4 cylinder with a gap in the middle, offset at 90 degrees to the centre 4. If there are...
  6. Lou Scannon

    Designing a cam

    Along with the mechanics for 5000 rpm, you should be looking at the fluid dynamics... Do you have a calibrated engine model telling you what volumetric efficiency you will be getting with a given cam profile, valve diameter, and port flow coefficient set? ASSuming you have a power target and...
  7. Lou Scannon

    balance question

    https://www.amazon.com/Kinematics-Dynamics-Machines-George-Martin/dp/1577662504
  8. Lou Scannon

    Honda Recall - 3.5L main bearing problems

    I once purchased a replacement dash pad over ebay. The top was intact and pristine in the photos and when I received it. But the jerk selling it, when he removed it or packed it, destroyed a lot of the important structure underneath, so I returned it for a refund.:rolleyes:
  9. Lou Scannon

    Can IC Engine Compression Testing with/without Blanks on Inlet and Exhaust Manifolds Quantify Valve Leakage?

    sounds like a crock of :poop: to me
  10. Lou Scannon

    Can IC Engine Compression Testing with/without Blanks on Inlet and Exhaust Manifolds Quantify Valve Leakage?

    Did you confirm your findings via disassembly and conventional measurement?
  11. Lou Scannon

    Can IC Engine Compression Testing with/without Blanks on Inlet and Exhaust Manifolds Quantify Valve Leakage?

    Too many uncontrolled variables/sources of error is my immediate thought.
  12. Lou Scannon

    A little sanity ...

    Thanks, I meant propeller, of course.
  13. Lou Scannon

    A little sanity ...

    How about at the system level, considering bulk, mass & consequent added drag of a fuel cell vs turbofan? If your motor would drive a turboprop, good marks for propulsive efficiency, but I assume lower productivity potential due to presumed lower cruising speed vs turbofan, never mind the...
  14. Lou Scannon

    what is old is new again ...

    ...like, if a gust load is too high, the wings come off?
  15. Lou Scannon

    Fine Dyno tuning

    At WOT under load?!![surprise][wink]
  16. Lou Scannon

    Step Load Vs Cylinder size/Charge pressure Vs Efficiency - Relation

    The OP's question was not phrased very clearly. I think Tug and I both read it the same way: the first sentence was talking about power density, so we interpreted the final question to be talking about efficiency meaning efficient use of the displacement, i.e. power density also. In that...
  17. Lou Scannon

    Step Load Vs Cylinder size/Charge pressure Vs Efficiency - Relation

    My bad, NFPA 110:giggle: That's very interesting. Do you have a link where this is claimed or demonstrated? (the step load capability, not flywheel effect);)
  18. Lou Scannon

    Step Load Vs Cylinder size/Charge pressure Vs Efficiency - Relation

    For that power density, I assume the 100% step load capability is when fully warmed up, not from a cold start, NFPA 52 style. :unsure:
  19. Lou Scannon

    internal combustion engine stuck valves

    Some Waukesha engines run pretty hot. Are your exhaust temps within the prescribed limits? I assume so, as I expect this is monitored in operation with programmed alarms/derates/shutdowns as needed but I'm just guessing. Oil analysis has been discussed. But, are you using a factory...
  20. Lou Scannon

    Turbocharger manifold design

    Excellent guidance from BP. To that I will add, it is desirable to have a constant cross-sectional area from the valve pocket to the scroll inlet.

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