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ignition coil high voltage side interfaced to stamp — Parallax Forums

ignition coil high voltage side interfaced to stamp

Lab RatLab Rat Posts: 289
edited 2010-11-26 12:31 in General Discussion
ok i am planning on converting a gasoline motor over to diesel. i have done sone extensive research and i know most of what needs to be done. what i cant figure out how to do is to get the timed pulse to the fuel injectors. keep in mind i am going to be using a 1950 studebaker flathead motor so i have absolutely no onboard sensors or computer available to tap into.
my idea was to control the injectors via the spak plug wires because the spark plugs on a gas motor are set to fired at the same time as a diesel motor would inject fuel but i cant figure out a reliable way to interface the high voltage spark to a low voltage computer

my first idea was to use highvoltage solid state relays.
then i thought maybe i could use stage 2 transformers. (step down) into rectifers then to voltage regulators.
i also thought of using a crank shaft sensor to count the teeth on the flywheel and using a stamp or something to control it. any ideas

Comments

  • DonNDonN Posts: 11
    edited 2010-11-25 08:23
    Why not use the distributor contact points as a switch? Remove the condenser too.
  • LeonLeon Posts: 7,620
    edited 2010-11-25 08:40
    Just a few turns of wire round the spark plug lead should do. You will need some signal conditioning, of course.
  • stamptrolstamptrol Posts: 1,731
    edited 2010-11-25 09:53
    Flathead Studie as a diesel?! What have you done to get the compression high enough to ignite the fuel?

    As for triggering an injector, you could modify the distributor rotor to be an optical interrupter. A Hall effect sensor could also be adapted.
  • Lab RatLab Rat Posts: 289
    edited 2010-11-25 12:31
    well i am obviously doing a complete rebuild but i will probably be custom machining a new head for it with supertight clearances to bring up the compression and to be able to install glowplugs and fuel injectors.
    what material should i use would stainless steel work?
    think put a turbo on would help the compression. (i like the way turbos sound coming out the exauhst lol)

    i put some thought into it today and i might be able to build an inside-out armature so to speak. for the contacts in the distributor . it would be like putting the brushes on the shaft instead of the case.

    i asked my grandfather what it would take to turn a gas motor to diesel and he tolod me more then i want to do. and you know that if someone says something like that ur gonna try it lol
  • Lab RatLab Rat Posts: 289
    edited 2010-11-25 12:35
    as of right now i am still in the design and planning stage. i still have to get money together to buy the second motor i have one already that runs gas. or will when i rebuild it. but i know where one sits that is as good as mine maybe even two of them.
  • icepuckicepuck Posts: 466
    edited 2010-11-26 12:31
    If you could get the compression up 12.5:1 or higher it should work, then make up the rest with a turbo.
    If it's a 4cyl you might have a look at a mechanical injection pump from a 1.6-1.9L vw diesel. Those are run from a timing belt.
    One other thought is to look around at some of the diesel forums out there. there was one were some one was trying to develop an aftermarket common rail setup to replace the mechanical injector pumps that are hard to find parts for.
    -dan
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