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plug gap?

kully 560
kully 560
in Electrical

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comment_587376

 I am using ngk plugs bpr6es-11 with a gap of .041 and a msd 6al ignition and the blaster 2 coil.  I am just looking for what other members are doing for plug gaps . I have a l28 block with n47 head and 1971 su 4 bolt carbs all stock . I see the 240z runs about .031 on the gap and the 260z runs about .036 on the  gap and now the 280z runs about .044 on the gap . it looks like the fuel injected cars run a higher gap. I like the projected tip plugs the best for these carburetor cars ,and  I am going to  order some new plugs and the ngk bpr6es has a smaller gap than the bpr6es-11 . just looking if I should go with the smaller or the larger gap plugs. thanks

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comment_587380

hello siteunseen again, I had my gap set to .050 with my set up and today I changed my plugs to the ngk bpr6es-11 gap that I had laying around .   the ngk factory setting was at .041 and the car ran better with the closer gap. we spoke the other day about my carbs and I finally finished the float setting . I had to have the wife blow in the gas inlet tube as I set the floats to .55 and now my mixture screws are set at 2 -1/2 turns down . I had a slight stumble of line but I corrected that with a slight increase in idle speed by about 40 rpms and the stumble is gone. so know I am just playing with an ignition tune- up . but the car ran better going from the plug gap at .50 down to .041. if I decide to go lower I will order the plugs with out the 11 at the end. just looking to see what others are set at also . thanks for your reply 

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    comment_587381
    30 minutes ago, kully 560 said:

     I am using ngk plugs bpr6es-11 with a gap of .041 and a msd 6al ignition and the blaster 2 coil. 

    The MSD 6AL is a "high energy" ignition system.  Your setup looks right, as-is.   The 75-77 280Z's ran a smaller gap than the 78 280Z's because they did not have the high energy system yet.

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