Spark plugs
19 April 2003, 10:13 PM
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Hi ,
i found this on a site, what do you guys think
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SPARK PLUG GAPS AND BOOST LEVELS
It has been found that if boost levels pass 1.2 bar, then the spark plug gap should be closed down. Look at the chart below.
1.2 bar Ngk pfr 6b9 .9mm or .035"
1.25 bar Ngk pfr 6b9 .8mm or .032"
1.3 bar Ngk pfr 7b9 .7mm or .028"
1.4 bar Ngk pfr 7b9 .65mm or .026"
1.5 bar Ngk pfr 8b9 .55mm or .022"
It has been found that the rapid pressure change in the cylinder can, in high boost applications, shift the spark off the end of the plug and cause a misfire.
The early model pre - 1997 cars are only rated at 1.1 bar of boost. Post 1997 are rated at 1.3 bar.
In some countries, differing weather conditions can denote hotter or colder spark plugs. I use NGK spark plugs and this is only a guideline based on standard models.
Regards Mike
i found this on a site, what do you guys think
-----------------------------------------------
SPARK PLUG GAPS AND BOOST LEVELS
It has been found that if boost levels pass 1.2 bar, then the spark plug gap should be closed down. Look at the chart below.
1.2 bar Ngk pfr 6b9 .9mm or .035"
1.25 bar Ngk pfr 6b9 .8mm or .032"
1.3 bar Ngk pfr 7b9 .7mm or .028"
1.4 bar Ngk pfr 7b9 .65mm or .026"
1.5 bar Ngk pfr 8b9 .55mm or .022"
It has been found that the rapid pressure change in the cylinder can, in high boost applications, shift the spark off the end of the plug and cause a misfire.
The early model pre - 1997 cars are only rated at 1.1 bar of boost. Post 1997 are rated at 1.3 bar.
In some countries, differing weather conditions can denote hotter or colder spark plugs. I use NGK spark plugs and this is only a guideline based on standard models.
Regards Mike
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