BMW Airhead cylinder temperature gauge hack.

Discussion in 'Equipment' started by Luminary, Mar 14, 2018.

  1. Luminary

    Luminary n00b

    Joined:
    Mar 9, 2012
    Oddometer:
    5
    Hello all,
    30 years ago I had an idea.
    I put confectionary (Taylor candy) thermometers in the weep holes near the spark plugs. They fit right in snugly. I know it seems odd and perhaps silly to some, however I’ve been doing it for 30 years on my /7s. They are 6-7 dollars each. Of course they aren’t perfectly accurate but they give you a relative reading and provide much visual information ig. If it goes to deep fry, it’s time to cool it off. I let them get to 150 for warm up. If a cylinder is running to lean or rich you know right away. After about 3 years I usually replace them. Sometimes I add a spring to keep vibration down. No wiring or anything, just push them in.
    I thought I’d share this and I’m sure I will get some negative replies or comments oh well. I can’t be without them and I’m thinking of producing my own dials. Try it! Luminary

    Attached Files:

    #1
    mouthfulloflake, scootac and motu like this.
  2. Gruesome

    Gruesome Alter Heizer

    Joined:
    Apr 28, 2007
    Oddometer:
    1,357
    Location:
    Chicago
    Looks spiffy! You can never have to many instruments...
    #2
  3. MeanMoe

    MeanMoe one really mean cat

    Joined:
    Oct 26, 2004
    Oddometer:
    2,676
    Location:
    Boonies
    Love it! A simple, mechanical solution.
    #3
  4. Luminary

    Luminary n00b

    Joined:
    Mar 9, 2012
    Oddometer:
    5
    It’s very useful.

    Attached Files:

    #4
    IdahoAirhead and WooPig like this.
  5. Luminary

    Luminary n00b

    Joined:
    Mar 9, 2012
    Oddometer:
    5
    More pictures coming.
    #5
  6. IdahoAirhead

    IdahoAirhead Been here awhile

    Joined:
    Sep 9, 2016
    Oddometer:
    488
    Location:
    S/E Idaho
    Luminary, that is a very elegant looking dash/top clamp setup.
    Very nice!
    #6
  7. Runaway Train

    Runaway Train The Left-Right Tourer

    Joined:
    Aug 9, 2013
    Oddometer:
    182
    Location:
    Ontario, Canada
    My old man did this on his cruiser except he used an old thermometer from a dead barbecue. the Clips bent so it would stay in the fins. It was horribly inaccurate but was a conversation starter.
    He also was known to wrap salmon and onions in foil and attach that to the side of the cylinders with wire. I come to my thriftiness honestly.
    #7
  8. IdahoAirhead

    IdahoAirhead Been here awhile

    Joined:
    Sep 9, 2016
    Oddometer:
    488
    Location:
    S/E Idaho
    So what is the optimum operating temp on a candy thermometer?
    Somewhere between caramel and hardball?
    :rofl
    #8
  9. Flipflop

    Flipflop Been here awhile

    Joined:
    Mar 18, 2009
    Oddometer:
    421
    Location:
    NC
    Cool idea
    #9
  10. Keithert

    Keithert Long timer

    Joined:
    Jan 6, 2013
    Oddometer:
    1,247
    Location:
    NW suburbs of Chicago, IL
    I just use an infrared thermometer. What temp should an airheads head be when warmed up?
    #10
  11. vagueout

    vagueout Long timer

    Joined:
    Mar 3, 2010
    Oddometer:
    2,861
    Location:
    sydney, east
    Do you ever get tired of people asking you about the gauges ?? 100/7 was my first ever bmw, that was 36 years ago and have had no other brand since. Just this weekend collected a 4 mth old Urban GS, it has engine (oil i think) temp on the speedo.:bubba
    #11