What NGK Plugs To Use?

Discussion in 'PSI Superchargers Tech Questions' started by BEDNAR1320, Nov 18, 2015.

  1. BEDNAR1320

    BEDNAR1320 Member

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    In a BBC 11:1 comp, conventional head, 14-71 running 16-18lbs boost. Injected alcohol, of course.

    Currently use 9's
     
    #1
    BEDNAR1320, Nov 18, 2015
  2. Mike Canter

    Mike Canter Top Dragster
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    NGK R5671a-10 with that kind of boost. Your -9's would probably do just fine but better to be safe with a -10. The heat range doesn't change your tuneup or how the plugs read.
     
    #2
    Mike Canter, Nov 18, 2015
  3. swansonhydro

    swansonhydro Member

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    Hey We run 10s as well. We have a simalar set you as you. Bednar as iv seen in your other post. 540 BB3 380s Fully cnc the works. Rons injection. 2015 278 Spitzer T/D. New car earlyer this year. We ran alot of races this year. If you got any more questions let me know. I run simar boost numbers. I do it on an 8-71 will hopfuly be switching to a 14-71 maybe sometime over the winter. It on the list of stuff want to change but we will see.
     
    #3
    swansonhydro, Nov 18, 2015
  4. Nemo963

    Nemo963 Member

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    We ran the -9 last year as well (first year with this setup). 548 BBC, afr 355 CNC heads, 10-71 TBS (16 lbs of boost) and rons dual terminators in a 2015 2100lbs M&M dragster . Maybe switching to a -10 is in order for us....only got 6 passes on this new car trying to shake it down before winter. Our compressi N is a touch lower at 10.6:1 (.58 thick gasket)
     
    #4
    Nemo963, Nov 18, 2015

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