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zbogusz

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About zbogusz

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  • Map Location
    Oxnard, California
  • Occupation
    retired

My Cars

  • About my Cars
    Just bought a headache, 1970 240Z, HLS3003648, L28 block, w/E31 512 lift cam, w/loose valve seat, triple Mikuni 44, 280 distributor, 60 amp alternator. Front tire 16x8, rear 16x9, R200 3.73, sway bar front 1-1/8 and rear 1-0. Plus a truck bed full of extra parts, P90, LD280 crank, new piston set w/rings, rods 9mm bolts. The list goes on and on. Hopefully, I can make a good running car. Presently running a rebuilt L24 block, w/E31, w/3/4 race cam, light weight flywheel, 3 bolt SU carb's, Crane electronic ignition, headers 6>2>1 3" mantel bent exhaust. But, have small electrical problem.

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  1. 1971 Datsun 240Z plugs fowling when idling

    1. Lorne

      Lorne

      zbogusz, I am new to this platform and am not sure if you are asking me why your plugs are fowling or if this comment/question was meant for someone else?? I will say that I have had a similar issue with my 260Z in the past. The plugs were fowling to a black color and moist with fuel. I purchased the Z with triple Weber carburetors and a mild cam installed. The previous owner did not change the exhaust manifold or the ignition components from the OEM parts and as such the car was taking in a lot of fuel, not completely igniting the fuel while compressed, and had a very low ability to "exhale" the exhaust. The result was a large amount of black exhaust emitting from the exhaust pipe, which concerned me greatly. After many hours of rebuilding, replacing carburetor jets and fussing with the carburetors, I spoke to Steve Nelson from Top End Performance in California about my issue. Steve suggested that I needed to add a Pertronix electronic ignition and a header to the mix. I took his advise and noted an immediate change in the level of fowling of the plugs and a huge decrease in black smoke emitted from the exhaust pipe. As a result, I now have a Z that runs very well, uses way less fuel and has almost now black smoke coming out the back end. I hope this helps you with your issue and would like to hear back from you if it makes a change or if the problem persists.

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