Asked About Plug Gaps

[grumpyvette]

itS BEEN MY EXPERIANCE THAT ,if your ignitions functioning correctly youll rarely see any improvements over what a .042-.045 gap provides in an N/A engine application, TIGHTER OR WIDER GAPS CAN AND AT TIMES DO CAUSE PROBLEMS OR LOWER POWER, in theory the larger gap requires a good deal more voltage and the ignition may become difficult at high rpms, lower gaps don,t get the cylinder lit off as effectively at times, keep in mind at 6000rpm the cylinder fills, is compressed and needs to fire and burn in well under 25-30 degrees of piston movement in the 720 degree cycle and thats hapening at 50 plus times a second

 

 

http://performanceunlimited.com/illustrations/sparkplugs.html

 

the plugs are normally done (the electrodes cut back)with a dremel tool cutting disk

 

 

a few places to look for more info on plugs

 

http://www.acdelco.com/html/pi_plugs_ident.htm

 

 

http://members.uia.net/pkelley2/sparkplugreading.html

 

http://www.atlanticjetsports.com/_techtalk/00000005.htm

 

http://www.strappe.com/plugs.html

 

http://www.babcox.com/editorial/cm/cm59910.htm

 

http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf

 

http://www.nightrider.com/biketech/spkplghnbook.htm

 

http://www.tsrsoftware.com/sparkplug.htm

 

http://www.gnttype.org/techarea/engine/plugs.html

 

http://www.dansmc.com/sparkplugs1.htm

 

http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp2.asp

 

 

 

http://www.edelbrock.com/automotive/sparkplugs.html

 

 

 

http://www.powerarc.com/sparkplug.htm

 

http://www.carcraft.com/techarticles/64378/

 

http://www.wakularacing.com/TechnicalInfo.htm

 

http://www.geocities.com/MotorCity/Flats/3877/spark.html

 

 

this is how a sparkplug gets most of it's heat range.

 

 

[dsommer]

That was and interesting read. Thanks again!!!! I'm going to do that this week!!!

 

David

[dr_hunt]

For alky applications where compression is 13:1 or higher, you won't get it to fire with wide plug gaps. Especially on alky anything over .025 and it'll miss on the top end.

[jap tin]

Dr Hunt is right on the alky. Were at 10:1 29% over with the 6-71 and set them down at .018 with a Super Mag V hopped up to 8 amps.