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  1. gruntguru

    Tesla Cybertruck fire and alleged design flaw. . .

    Shouldn't be a huge leap to group all the failures that are likely to occur in a collision, assume they might all occur simultaneously in such an event and mitigate accordingly.
  2. gruntguru

    Tesla Cybertruck fire and alleged design flaw. . .

    Things like this should be captured by basic certification rules. FFS all the fine detail that has to be ticked for lighting, glass, vehicle dynamics, crash-testing . . . And now it appears that being able to open the door in an emergency is a feature that will have to be tested in the courts.
  3. gruntguru

    Designing a cam

    Its an interesting exercise and its great if that is the reason you are doing this. OTOH if you are designing this yourself because you think it is the best way forward, you need a reality check. The sensible route is to talk to a cam specialist and find a stock profile that can be adapted to...
  4. gruntguru

    Designing a cam

    Correct. Brian is using crank degrees which is usual. So his suggestion is 220 - 240 crank degrees ie 110 - 120 cam degrees.
  5. gruntguru

    balance question

    The crankshaft in your posted image has 4 pistons at TDC every 90 degrees of rotation. This will only permit simultaneous firing with a pair of cylinders firing together. If you wand regular individual firing you will need to put a 45 deg twist halfway along the crank.
  6. gruntguru

    Honda Recall - 3.5L main bearing problems

    . . . and even if it is totally original and runs like a clock, it will have been repaired and reconditioned to within an inch of its life.
  7. gruntguru

    Honda Recall - 3.5L main bearing problems

    Interesting post but not data. Makers have always had recalls - even back when the consequences of not having a recall were far less serious than now. Cars are far more effective, complex and tightly toleranced than ever before yet reliability is (probably) higher.
  8. gruntguru

    Electrical Power Stirling Engine Magnesium fuel?

    If you want heat energy there are all sorts of things you can burn or react. Pretty confident there aren't any that haven't already been considered and rejected.
  9. gruntguru

    Honda Recall - 3.5L main bearing problems

    Do you have some data to support that?
  10. gruntguru

    Hydraulic Actuated Rear Wing system

    Max downforce would be appropriate for all braking events greater than some threshold.
  11. gruntguru

    Follow Up

    I have always wondered whether sudden droop-limiting by the shock or external droop limiter causes undesirable handling anomalies during (eg) at-the-limit cornering plus bumps. One solution would be to secure the spring to its seats so it goes into tension during large droop excursions.
  12. gruntguru

    Follow Up

    Surely there's a Transit fanboy forum somewhere on the net?
  13. gruntguru

    Hydraulic Actuated Rear Wing system

    I think Brian described the scenario where that response is desirable. Vmax on a straight - transitioning to max braking.
  14. gruntguru

    Carb. Jetting using an A/F gage

    15-16 is fine. As long as it has enough spark advance that AFR will give best economy.
  15. gruntguru

    Troubleshooting ADXL345 Data Inconsistencies Under High-Frequency Vibrations: BW_RATE Tuning & Interface Selection

    Don't know this device specifically but I think the following information would be helpful. ". . . . subjected to high-frequency vibrations" - Is this a pure sine wave of known, fixed frequency? Bandwidth (data rate) to 3,200 Hz not what I would call high-frequency. Is your test frequency...
  16. gruntguru

    Thoughts on decoupled suspension.

    Ouch - not much to do with frequency response. Simple case of roll moment distribution going near 100% rear.
  17. gruntguru

    wet clutch material

    Not full depth slots. Just shallow ones across the friction surface.
  18. gruntguru

    wet clutch material

    OTOH slots allow oil to escape more readily during engagement. They also reduce the contact area, increasing the contact pressure and improving the rate of collapse of any oil film.
  19. gruntguru

    Carb. Jetting using an A/F gage

    Or a sprocket change.
  20. gruntguru

    internal combustion engine stuck valves

    The first thing that should be done after a failure like that is to measure valve stem diameter and valve guide bore diameter and compare to specification. I assume this was done. What were the results? If clearance is less than it was when it was last assembled you have contaminant buildup. Are...

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