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Thread: After lot of searching, I'm finally admitting defeat...

  1. #1
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    After lot of searching, I'm finally admitting defeat...

    ... and having to ask what I no is going to be an incredibly stupid question!

    What the hell does CAS stand for?!?!?!?!?!?!

  2. #2
    Guest SM's Avatar
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    Crank/Cam Angle Sensor.

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    I Love mike Brewer )o( Monkey's Avatar
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    Crank Angle Sensor

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    Quote Originally Posted by Monkey
    Crank Angle Sensor
    how does it measure crank angle... its attached to a cam. My question is, why is it a mitsubishi item?

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Quote Originally Posted by Razzario
    how does it measure crank angle... its attached to a cam. My question is, why is it a mitsubishi item?
    RTFM....

    The crank angle sensor is a basic component of the entire ECCS. It monitors engine speed and piston position and sends signals to the ECU to control fuel injection, ignition timing and other functions.

    The CAS has a rotor plate and a wave-forming circuit. The rotor plate has 360 slits for 1 degree signal and 4 slits for 180 degree signal. Light emitting diodes and photo diodes are built into the wave-forming circuit. When the rotor plate passes between the LED and the photo diode, the slits in the rotor plate continually cut the light being transmitted to the photo diode from the LED. This generates rough shaped pulses which are converted into on-off pulses by the wave forming circuit, which are sent to the ECU.....

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    Quote Originally Posted by Razzario
    how does it measure crank angle... its attached to a cam. My question is, why is it a mitsubishi item?
    Because the crank and the cam turn in unison so you can measure the turning of the crank from the cam.

    .. and because Mitsubishi make parts for the automotive industry as well as whole cars....planes...heavy plant..and other stuff.

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    Quote Originally Posted by Razzario
    why is it a mitsubishi item?
    same reason the AFM is made by Hitachi

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    Quote Originally Posted by sideways danny
    same reason the AFM is made by Hitachi
    You'd think it would make a better noise being made by Hitachi but all I can get out of mine if pigeon noises - no bass boom at all

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    Quote Originally Posted by jwilkins
    Because the crank and the cam turn in unison so you can measure the turning of the crank from the cam.
    Do they?

    I thought the cams turned quicker being that there are doing twice as many cycles as the crank?

    Crank has 4 pistons, each cam has 8 valves?

    Col

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    In unison means "together, as one" not necessarily in the same ratio. That means that you can determine the movement and relative position of one from the movement/position of the other provided they both start at known positions.

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    Quote Originally Posted by ColinR
    Do they?

    I thought the cams turned quicker being that there are doing twice as many cycles as the crank?

    Crank has 4 pistons, each cam has 8 valves?

    Col
    Actaully camshalf turns at half the speed of the crank

  12. #12
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    Ye, but only on a 4-stroke. It's 1-2-1 on a 2-stroke

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    Quote Originally Posted by jwilkins
    Ye, but only on a 4-stroke. It's 1-2-1 on a 2-stroke
    ???

    Two stokes don't have cams

    Or have I misunderstood your post...

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    Colin implied that the cam to crank ratio was because there were 4 pistons and 8 valves.
    The number of cylinders/valves is irrelevant, it is because it works on a 4-stroke cycle that results in the 1:2 ratio as the exhaust cam only opens every other time the piston comes up the cylinder. That would be true for a single cylinder engine with one inlet and one exhaust valve.
    I was just being silly about the 2-stroke because you get an exhaust stroke for every turn of the crank

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    Ok, so.. is the CAS the turny thing you adjust your ignition timing with? (Front right on the engine?). I'm asking as I need a good auto alectrician to install a cable for my LPg ignition advance module

    Rich

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    Quote Originally Posted by jwilkins
    I was just being silly about the 2-stroke because you get an exhaust stroke for every turn of the crank
    That's ok then - faith restored

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    Quote Originally Posted by Richy_Boy
    Ok, so.. is the CAS the turny thing you adjust your ignition timing with? (Front right on the engine?). I'm asking as I need a good auto alectrician to install a cable for my LPg ignition advance module

    Rich
    Yep. That's the CAS. It has a 3-diamonds Mitsubishi symbol on it.

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