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Thread: 4A Distributors

  1. #1
    Senior Member Stain's Avatar
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    Default 4A Distributors

    Can you use a dissy from any 4A engine on another 4A engine?

    Reason I ask is I've just rebuilt a AE92 Smallport 4AGE, although I don't have a dissy for it...
    But I do have a 4AC and AE82 Bigport 4AGE dissy here... will they work?

    Thanks

  2. #2
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    unfortunatley no they wont

    a 4ac dizzy is very simple with points and works independantly

    a 4age bigport dizzy is electronic but works in a basic way to give the ecu a signal of engine speed and what not.

    a 4age smallport dizzy is from my understanding very close to gze Crank angle sensor, with the distributer part built around it.

    reason i know this is that when using an aftermarket ecu they reckon (especially for megasquirt) that a smallport dizzy gives out a nicer signal than the bigport one.

    i believe small port dizzy has 4 wires as opposed to the big port dizzy having 3 wires.

  3. #3
    Senior Member Stain's Avatar
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    What if I'm planning on using a stock Bigport ECU? Wouldn't it be better to use the Bigport dissy? or is the mounting phyiscally different?

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    all 16v 4age dizzys will physically fit.

    but only dizzys from an ae82 twinky, or a jdm 86 will work.

    big mr2 wont work. neither will small port. different cas/cas signal.

    im not sure about early ae92.. i.e the big port with the 42 crank.

  5. #5
    Veteran slydar's Avatar
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    and so.. you have the right dizzy to go with the ecu, and yes itll fit in the small port head NP.

  6. #6
    Senior Member Stain's Avatar
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    Okay cool, that's all I needed to know.

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    Just thought that I would add that the AE80 3ac & AE82 4ac dizzy is electronic.

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    go have a look at the tech doc on I can't remember which one 96 maybe? It gives an expanation of ESA (generally bigport) and VAST (generally smallport) ignition systems.

    Ke70dave - do you have much experience with megasquirts? I'm having a little bit of difficulty getting it to recognise the signal from my bigport dissy. I've modified the NE signal wheel (24 tooth) to a 12-1 decoder wheel, but no loving so far! I'm refitting the standard wiring and ecu to get it running and will play with the MS2 on the side.

    Chris

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    serious question! does anybody in australia have any idea about megasquirts? i know they the one of the most bang for buck aftermarket ecu's but it seems that no one in australia has any clue about them

  10. #10
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    have a look at (megasquirt forums). There are a number of guys on there and I've come across a few from toymods.

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