Re: Proper Spark Plug Gap? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Proper Spark Plug Gap?
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Posted by Dean (more from Dean) on Fri, 21 Jun 2002 10:42:03 Share Post by Email
In Reply to: Proper Spark Plug Gap?, Robin [Profile/Gallery] , Fri, 21 Jun 2002 10:04:07
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the bcpr[6|7]es11's leave the factory at 1.1 mm

the nominal Saab gap spec is 1mm which is .039mm

there is also a gap tolerance band of .039 +xxx -xxx

so the gap does not need to be exactly .039

larger gaps from when the gap erodes can run poorly

smaller gaps run well, so if you gap to .035, the gap will erode towards .039

TG will object strongly!

with higher boost pressures, the break down voltage across a gap increases, so often the gaps are reduced for higher pressures

the viggens had (still?) some strange ngk platinum plugs from the factory that did not work well, some regapped, but many remove and installed bcpr's

some found that the smaller gap in the Viggens ran better, but a year later some thought that the power was better with the .039 gap, who knows, you would have to try it

not all ngk platinums are the same, i run bcpr6evx11's, but they are very expensive, if they do not last 4 years its not worthwhile, I gap at .035 and clean/regap once a year, so no savings in effort

95SET, 30 to 31 mpg at 75 mph, 150000 miles, 5W40 Delvac One

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