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Latest Discussions

  • Posted in: Automotive Sector

    Hi Jerry, This is the best info I have found regarding crankshaft torsional balancers / absorbers:   http://www.epi-eng.com/piston_engine_technology/crankshaft_torsional_absorbers.htm   I am not a degreed engineer, but I am guessing crankshaft torsional resonant frequency(s) would have to ...

  • Posted in: Open Forum

    To all, My vehicle is a Tahoe and I've replace the battery do to the fact that in electronics continue to run after I've shut it down. The battery life stated by the manufacture is one year maximum reality is it is a lot less than three years. Regards, Robert Peters President & C.E.O. ...

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    RE: Battery voltage

    Posted in: Open Forum

    I agree every time you kill the battery connection a lot of stuff defaults to presets or zero.  I primarily use cut out for security situations and if I am leaving the car to sit for a long period of time and I want it to start when I get back.  Hide the switch and insurance company will give you a discount. ...

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    RE: Battery voltage

    Posted in: Open Forum

    Jerry, you can wire in a cutoff switch, but just killing power would have the effect of dropping all of the OBD Readiness flags to zero (not ready for inspection).   That would result in an inability to pass an emissions inspection, at least. ------------------------------ Barry Morse Senior Technical ...

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    RE: Battery voltage

    Posted in: Open Forum

    I cannot definitively answer, but I do know that, on most vehicles, fuel system evaporative leakage diagnostic routines are run when the vehicle is shut off and fuel system pressure measurement would not be confounded by constantly changing fuel demand.   With the vehicle shut off, he engine control ...

  • Posted in: Automotive Sector

    Dear Gustavo,  although I don't have any formal research to back up the precision of the measurements taken with the smartphone, at one of our research centers our graduate students use their smartphones all the time to measure acceleration in many non-critical road testing applications. They usually ...

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    RE: Battery voltage

    Posted in: Open Forum

    Here is my guess as to what is happening with the battery voltage. A real battery will have some internal resistance.  Think of the circuit as being an ideal battery with a resistor in series.  When their is no current, i.e. the ignition has been off for some time, there will be no voltage drop across ...

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