How do Atom Computer Ignition modules work?

Home Forum Ask A Member How do Atom Computer Ignition modules work?

This topic contains 215 replies, has 29 voices, and was last updated by Avatar joesnuffy 2 years ago.

Viewing 15 posts - 181 through 195 (of 216 total)
  • Avatar
    garry-in-tampa
    Lifetime Member
    Replies: 3072
    Topics: 30
    #25922

    Avatar
    greg-o

    Replies: 32
    Topics: 5
    #25935

    I put one of those in a old John Deere chain saw I have. It worked great. No more cleaning and adjusting the points. But have never tried it on an outboard motor. But I agree with the previous post. As engine rpm increases, so does voltage.

    Avatar
    debe

    Replies: 103
    Topics: 0
    #25952

    Yes the voltage does rise, but the timing doesn’t appear to alter using a timing light.

    Avatar
    joesnuffy

    Replies: 285
    Topics: 20
    #58773

    I have been studying this older thread and my question is for Gary. Does your diagram I posted here I don’t see the Mosorb diode 1N6303A used. Does your circuit need it or does the BD649 switching diode not need it? Is this the last circuit they came up with that folks should build if trying to do this?

    Thanks,
    Joe


    Attachments:

    Avatar
    debe

    Replies: 103
    Topics: 0
    #59666

    joesnuffy, I am the person that originaly reverse engineered the Atom Ign module. Do not use a BD649 transistor as it wont last. As I cant post pictures here I have found that for reliability you need to use a 2SD1071 transistor & the 1N6303A Mosorb diode.

    Avatar
    joesnuffy

    Replies: 285
    Topics: 20
    #59668

    " I am the person that originaly reverse engineered the Atom Ign module. Do not use a BD649 transistor as it wont last. As I cant post pictures here I have found that for reliability you need to use a 2SD1071 transistor & the 1N6303A Mosorb diode"

    Thanks Debe for clearing that up. I am going to be building me a few. I got most the stuff I need minus the 2SD1071 and the 1N6303A Mosorb diode. I got to order them.

    One question what is the silicone material you used for insulating the diode and where can I get it?? Also any tips??

    Thanks,
    Joe

    Avatar
    zul8tr
    US Member - 2 Years
    Replies: 148
    Topics: 4
    #59671

    How do these Atom units (and this RE circuit) compare to the Nova II units for points to electronic ignition ā“ Since Atoms are NLA and if the Nova II does the same thing why not use it instead of the built circuit ā“ The Nova II’s have been approved for use in APBA boat racing and they have made their way to the Yamato point ignition race engines and they work very well.

    Avatar
    joesnuffy

    Replies: 285
    Topics: 20
    #59673

    I have used nova IIs on 2 of my omc 2 cylinder 2 stroke engines with brand new omc coils. I have had good results that way and ran one of those engines yesterday for over an hour at wot. Its a 5.5hp 1960 johnson.

    Most everyone here has not had good results with nova II modules. Time will tell if the new omc coils will allow the nova II’s to hold up. I am guessing that older omc coils for whatever reason kill the nova II modules. That is a guess on my part but I am going to run those 2 modified engines this summer a lot to try and determine if that might be the case.

    I am building my own atom modules because its an easy non-expensive way to put them in all my motors and leave the ignition coils that are already in my outboard engines in them and see how they hold up verses the nova II modules using new omc coils.

    Atom modules hold up that is why I am building them.

    Joe

    Avatar
    debe

    Replies: 103
    Topics: 0
    #59674

    When I build a module I check first that is going to work, then I set them in 5Minute Araldite a 2 part epoxy type of resin.

    Avatar
    joesnuffy

    Replies: 285
    Topics: 20
    #59675

    Thanks where do you get the silicone material underneath the transistor??

    Avatar
    debe

    Replies: 103
    Topics: 0
    #59677

    Its a silicone heat sink material from electronic stores to suit TO220 transistor shape.

    Avatar
    debe

    Replies: 103
    Topics: 0
    #59679

    Theres a step by step pictures of how to assemble these on http://www.electro-tech-online.com/thre … le.142530/ its posted ATOM Diy module by debe.

    Avatar
    bob-d
    US Member - 1 Year
    Replies: 301
    Topics: 63
    #59680

    Great write up. Thank you.

    Avatar
    chinewalker
    US Member - 1 Year
    Replies: 445
    Topics: 17
    #59695

    I bought a module for my old Stihl chainsaw recently. Not sure if it’s the same thing, but I believe it works the same way. It mounts externally (coil is external to flywheel on my saw) and it replaces both the points and condenser. Worked really well! I might snag a pair of them at some point and see if and how they work in an outboard mounted under the flywheel.

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 4057
    Topics: 418
    #59698

    The Atoms were color coded for different applications and the red ones are what you want for outboard motors.

Viewing 15 posts - 181 through 195 (of 216 total)

You must be logged in to reply to this topic.