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Thread: Weak Sparkplug Theory...Or Wives Tale ?

  1. #21

    Re: Weak Sparkplug Theory...Or Wives Tale ?

    That is cool jwl. I used to machine poured babbit bearings for large electric industrial motors. They used a centrifical (SP) force spinning machine while pouring the molten babbit into the bearing chocks. The bearing chokes were in two halves. I would mill the spit lines of the halves to maintain the correct diameter on the chocks. The chock halves were then lightly spot welded to together so the bores could be finished.

  2. #22
    Join Date
    Aug 2010
    Location
    Twin Cities, MN
    Posts
    2,973

    Re: Weak Sparkplug Theory...Or Wives Tale ?

    This is the tester I used when I was an active Aircraft mechanic. Why would champion make such a cleaning and testing machine if it wasn't true to test under a load?

    http://m.aircraftspruce.com/catalog/...lickkey=492556
    Last edited by tomcat1; 09-19-2017 at 06:37 AM.
    1947 EL
    1947WL
    2000FLSTC

    But there's booze in the blender
    And soon it will render
    That frozen concoction that helps me hang on

    You never get better....you just get less awful. "Joe Walsh"

  3. #23
    Join Date
    Aug 2010
    Location
    Twin Cities, MN
    Posts
    2,973

    Re: Weak Sparkplug Theory...Or Wives Tale ?

    And yes I have cleaned and tested many aircraft spark plugs in my life. I use to work at a WWII museum which we had over 25 WWII warbirds. And four multi engine bombers. Everything had either 12 or 18 cylinders so do the math. And every year an annual inspection was done and cleaning and testing is part of it. And yes I've run into my fair share of plugs that tested good without a load and failed under a load. This is a true statement
    1947 EL
    1947WL
    2000FLSTC

    But there's booze in the blender
    And soon it will render
    That frozen concoction that helps me hang on

    You never get better....you just get less awful. "Joe Walsh"

  4. #24
    Join Date
    Apr 2015
    Location
    7,000 ft up on the Palmer Divide in the Colorado Rocky Mtns
    Posts
    377

    Re: Weak Sparkplug Theory...Or Wives Tale ?

    I have an old Champion Spark Plug tester that I use after I clean, file, & gap them. Some do stop working after 80-100 psi, those go into the scrap metal bin. Paps, jwl, I have a set of crankshaft & connecting rod babbit cutting/machining tools for Ford/Fordson auto & tractor motors (probably work on other makes) that I picked up when I bought a lot of Sunnen Hone parts. Don't need them, Anyone interested? PM me. Doc

  5. #25

    Re: Weak Sparkplug Theory...Or Wives Tale ?

    I am wondering if pressure actually causes the plugs to fail or fractures in the plugs which pressures uncovers ?

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