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  • Users: drwebb
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  1. drwebb

    Honda Recall - 3.5L main bearing problems

    So Honda is having trouble with their V6 main bearings: https://www.cnn.com/2024/11/11/business/honda-engine-recall/index.html Not a good look such a basic component has a defect coming from an OEM that leans into their engine durability prowess (or at least used to).
  2. drwebb

    Cruise Service Suspended by GM in SF After (ancilliary) Pedestrian Accident

    Initial report from earlier in the month: https://www.cnn.com/2023/10/03/tech/driverless-car-pedestrian-injury/index.html "Video shown to CNN by Cruise shows the autonomous vehicle was a secondary car in the collision" "Cruise cars have their own cameras . . . which may help in the investigation...
  3. drwebb

    Pennsylvania Chocolate Factory Explosion Cause

    thread815-504484 - original thread (closed) Turns out it was a gas leak from a decommissioned portion of the supply: https://www.ntsb.gov/investigations/Pages/PLD23LR002.aspx And OSHA says the employer should have evacuated the building upon reports of gas odor...
  4. drwebb

    U.S. Chemical Safety Board Issues Final Report on Arkema Crosby Incident- Epilogue

    Link "Visiting Judge Belinda Hill ended the case against the company and former Crosby plant manager Leslie Comardelle, finding not enough legal evidence for a reasonable jury to reach a different conclusion. They had faced felony charges for reckless emission of air pollutants." Original...
  5. drwebb

    2018 Southwest Airlines Flight 1380 Uncontained Engine Failure

    NTSB Abstract of final report issued: Link Some interesting conclusions. Despite contemporaneous popular press reporting, the lost window behind the wing was NOT impacted by the fan blade but by debris from the separated engine cowling, as posters on this forum hypothesized at the time. Often...
  6. drwebb

    GM Ignition Switch

    No Monday morning quarterbacking of this fiasco? Was it a lone engineer, acting independently, or part of a much larger conspiracy to bring down Government Motors hatched by Jimmy Hoffa, Fidel Castro and the mob? Who's up to formulate a 'magic detent' theory? This board was all over the...
  7. drwebb

    How much ethanol in US gasoline?

    Recall that EtOH replaced MTBE as a gasoline oxygenate in ozone non-attainment areas several years before the mandate to replace 10% of the petroleum component nationwide with ethanol. I have been given to understand that oxygenate requirement is IN ADDITION to the E10 base, so many...
  8. drwebb

    Reverse engineering for m/c head design

    I've got a Suzuki GS500 motorcycle, air cooled 2 cylinder DOHC shim on buckets operating 2 valves/cylinder. Not very high performance, but market longevity attests to it's design durability. I believe Suzuki originally produced a contemporary 1000 cc model with 4 valve head, but the 500 got 2...
  9. drwebb

    Headlights affecting mpg- how does it work?

    The April Automotive Engineering Intl. has an article on new LED headlights that cites "Valeo estimates that replacing halogen lights with LEDs is worth about 0.25 mpg, and replacing daytime running lights as well boosts the savings to 0.50 mpg," and seems to imply this is a direct result of...
  10. drwebb

    Driveline shear severities

    Shear stability requirements for gear oils are usually higher than for automatic transmission fluids. Why is this?
  11. drwebb

    HDDO vs. PCMO low T viscosity

    In US most SAE 40 multigrades for passenger car motor oils are 10W while heavy duty diesel oils are 15W. Is this a consequence of the total base numbers of the passenger car oils being 6-7 while the diesel oils are 9-10, or is it something else?
  12. drwebb

    Turbo vs. N/A city fuel economy?

    Some passenger cars offer gasoline engine options for the same displacement but with a higher compression ratio normally aspirated- and a lower CR turbo mill. The turbo has higher max power output of course, but I am wondering the likelihood it's lower CR will lead to higher city fuel...
  13. drwebb

    Dual Exhaust- are 2 pipes better than one?

    I have noticed several family cars today sporting dual tailpipes- i.e. one on each side of the back of the car. Yesterday I saw an older Camry with two tailpipes exiting the muffler next to a newer one with separate pipes on either side. Now true dual exhaust was the trick setup in the days of...
  14. drwebb

    lean fuel mix = higher engine T. Why??

    In as simple terms as possible, what is the mechanism by which an excessively lean fuel mix causes higher engine temperatures? I have searched through the archives and Stone's "Intro to Internal Combustion Engines" and haven't found a direct explanation. Someone posed this question...

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