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Thread: Disconnect battery while engine is running?

  1. #11
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by lgbr
    A lot of car alarms come with an ignition cut off relay. This will cut the ignition off, not allowing things like the fuel pumps, injectors, and spark plugs to operate.
    My car has no spark plugs, no computer to manage the engine, and a mechanical fuel pump. Erm, relay, erm, what do I do with that again.

    Once my engine is started, I could remove the battery from my car completely and the engine would still run. Diesels, don't ya love em.
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  2. #12
    Top Ramen lgbr's Avatar
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    Older diesels only need battery/alternator to power the starter and headlights. so yeah, you can do that.

    Unfortunately your car is way behind on the technology. There hasn't been a new car sold in america without fuel injection since 1990 (last was the Subaru Justy).
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  3. #13
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by lgbr
    Unfortunately your car is way behind on the technology. There hasn't been a new car sold in america without fuel injection since 1990 (last was the Subaru Justy).
    My car has fuel injectors. It has a mechanical injector pump and mechanical injectors. Your assumption that my car doesn't have fuel injection is false.


    Edit: To clarify, here are the specs for my engine. Mine is the 1.5TD: http://www.corsasport.co.uk/board/vi....php?tid=44333

    It uses 2 jet Pintaux, ID NP-DN OPD N 108 injectors. Not bad for an engine without fuel injection, huh?
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  4. #14
    It ain't easy being a green moderator meddler's Avatar
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    Quote Originally Posted by l4tran
    While the car is running, disconnecting the battery and alternator would that kill the engine??
    Probably not, but it's a real good way of blowing up your alternator. The output transistors in the regulator don't really like not having a load on them.
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  5. #15
    cheap custom title JC-S60's Avatar
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    Haven't seen ANY diesel without injection in a vehicle EVER... would you put in some diesel carburettors? To vaporize the diesel-OIL?

    I don't think so

    BUT, your car must have some system (probably an electrical valve in the fuel-line) to shut off the engine when you turn off the key. On the other hand, I know some older mercedes used to have a pneumatic system for that (and the central locking!).

  6. #16
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by JC-S60
    Haven't seen ANY diesel without injection in a vehicle EVER... would you put in some diesel carburettors? To vaporize the diesel-OIL?

    I don't think so
    Exactly...!

    Quote Originally Posted by JC-S60
    BUT, your car must have some system (probably an electrical valve in the fuel-line) to shut off the engine when you turn off the key. On the other hand, I know some older mercedes used to have a pneumatic system for that (and the central locking!).
    Very true. On my particular engine you need to apply current to open the valve, but on the Perkins 2.0L turbo diesel of the Austin Maestro (which is also a completely mechanical engine), you need to apply current to close it. Ie, the engine truly will run without a battery once it is started - you need a battery to stop it.
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  7. #17
    Variable Bitrate choyak's Avatar
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    I like the idea of the hydraulics so when you park the car, the chassis rests on the pavement, only way to steal the car then is with a forklift
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  8. #18
    Top Ramen lgbr's Avatar
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    Quote Originally Posted by choyak
    I like the idea of the hydraulics so when you park the car, the chassis rests on the pavement, only way to steal the car then is with a forklift
    Even then that's difficult, you'd need multiple forklifts to get it up, and they'd all need to find good locations to lift from.


    I wasn't aware there were mechanical injectors out there. I thought they were all electronic.
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  9. #19
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    Disconnecting the main battery while the engine running is bad. The battery is supposed to absorb the excess voltage from the alternator. Without the battery a much higher voltage can go into the car electrics and destroying what ever it can.

    The other thing is...what sort of relay that can handle the current of a battery? Trying to connect/disconnect those thick wires is not possible with a normal car relay.

    Its much easier to cut the fuel or ignition line.

    Look for geofencing...its where a gps position is set when you park your car. When the car is moved outside that perimeter defined by the software then an alarm is raised.

  10. #20
    Variable Bitrate
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    Thanks for all your response.

    Question 1 is pretty much answered.
    Queston 2 is still floating around. Is there a software that captures the coordinates from the gps and save it to text?

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