How to build a bench top Spark Plug tester

Discussion in 'The Projects Forum' started by Gdrumm, Oct 19, 2013.

  1. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    I've got a bunch of old lawnmower spark plugs I would like to test.

    I saw bits of a Youtube video in Russian, that shows one, with a coil and some other components I couldn't reccognize.

    Any thoughts on how I could make one?

    I have boxes full of electronic components I've saved.

    Surely there is an easy way to make one.

    Any ideas?

    Searches on Google just produces a million or so ads for spark plugs.

    Thanks,
    Gary
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Pick up an old style ignition coil and a distributor from a wrecker get an old single cyclinder cycl head from a mower etc to screw the plug into, and you have all the makings for probably less than $10.00.
    Not elegant electronics, but would work.
    Or a 555 and a Mosfet in the primary of the coil, if you want the elegant way?
    Max.
     
  3. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    Thanks Max,
    Gets me thinking.

    I have an old chainsaw that doesn't work, but has spark.
    It has no bar or chain either.

    I can remove the recoil and use a socket and drill to rig it for easy turnover, then connect the wire, and lay the sparkplug against the head, and give it a go.

    That should work.

    Gary
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    There you go! ;)
    Also you could get a piece of Aluminum plate and get it drilled and tapped with the 2 most popular sizes, 14mm 18mm ??
    And bolt the plate to the head or a bolt on the casting.
    Max.
     
  5. Gdrumm

    Thread Starter Distinguished Member

    Aug 29, 2008
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    36
    The old chain saw idea worked great.
    I went through a dozen old spark plugs, and found that 1/2 of them were good.

    It wasn't rocket science ..... oops; ...surgery.
    But it was Chain Saw Surgery, and that sounds scary here at Halloween.

    Thanks,
    Gary
     
  6. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Just for the record... How many rolls of duct tape were used?
     
  7. wayneh

    Expert

    Sep 9, 2010
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    Haha, old chainsaw as lab bench instrument. Gotta love it.
     
  8. pilko

    Active Member

    Dec 8, 2008
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    I use a peizo push-button igniter salvaged from an old BBQ. It produces a healthy spark on a good plug.
     
  9. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    The only thing with all of this is, when a plug is under cylinder compression it may not fire, when it will at atmospheric pressure. Why were the plugs removed from the motors? Probably cause they didn't work.:)
     
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