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Very oily spark plugs

 
Old 04-20-2013, 03:39 PM
  #16  
PorKen
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Originally Posted by dprantl View Post
You know that NGK BP7ES are two ranges colder than stock, right?
Not quite two, depending on how you look at the Bosch/NGK scales, and non-resistor, hence the larger gap (1.0mm).
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Old 04-20-2013, 07:37 PM
  #17  
545svk
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Originally Posted by dprantl View Post
You know that NGK BP7ES are two ranges colder than stock, right?

Dan
'91 928GT S/C 475hp/460lb.ft
Dan and PorKen.

No, I did not know this and to show my ignorance I am unsure of what this mean and what the implications are.

Is it OK to use them or should I order the Bosch plugs?

Thanks
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Old 04-20-2013, 11:57 PM
  #18  
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Fit all copper washers to all bolts, so I would suggest that you undo all set bolts, install copper washers and then tighten them down gradually - diagonally across the cover so that you impart even compression on the "O" rings and seals until you bottom out the bolts.
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Old 04-21-2013, 12:44 PM
  #19  
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I use the NGK plugs.

The big gap is more efficient.

I have dynoed up to 325 rwhp (uncorrected on a cold day, '86.5 5-speed) with them installed.


The only caveat is you must run the stock Bosch coil drivers (with a steel back).
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