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Thread: SJBMW Dual-Plug Conversion

  1. #16
    Registered User TRJeff's Avatar
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    Mar 2003
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    Two Rivers Wi.
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    Thumbs up surging

    For the people that can't spare the cash for the 2 spark up grades try indexing your sparkplugs. Use a single electrode sparkplug with lubricated threads and tighten so the open portion of the sparkplug faces toward the intake or one of the intake valves. tighten to 8 to 12 lbft. torque. indexing washers from Moroso can be purchased thru most high performance after market auto stores. reset your Motronic and five it a try it does help and is an inexpensive help.

  2. #17
    Focused kbasa's Avatar
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    Marin By God County, California
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    Re: surging

    Originally posted by Jeff
    For the people that can't spare the cash for the 2 spark up grades try indexing your sparkplugs. Use a single electrode sparkplug with lubricated threads and tighten so the open portion of the sparkplug faces toward the intake or one of the intake valves. tighten to 8 to 12 lbft. torque. indexing washers from Moroso can be purchased thru most high performance after market auto stores. reset your Motronic and five it a try it does help and is an inexpensive help.
    Take a look here for some information about how the FI system is mapped. The problem is that the bike is absurdely lean below 40% throttle.

    The legend on the side can be read this way: m = miss, sm = small miss DETONATION means lots of detonation and detonation means some detonation.

    In addition to the lean condition, the timing is too adanced for some throttle conditions.

    I'd guess that the miss is caused by there simply not being enough fuel available to promote consistent combustion. Running two plugs provides twice the ignition source.

    http://vma.cape.com/~patrick/temp/bmw_r1100rs.txt
    Dave Swider
    Marin County, CA

    Some bikes. Some with motors, some without.

  3. #18
    Registered User TRJeff's Avatar
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    Mar 2003
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    Two Rivers Wi.
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    lean running

    running 2 sparkplugs will speed up the flame thus advancing your timing, that the engine is running lean is accepted, indexing the plugs and aiming at the intake valves helps with getting the fire started in the combustion chamber more reliably. This is a very inexpensive help that keeps all engine systems active.

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