Plug Gapping
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Joined: 05-02-06
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From: Somewhere in the USA
Plug Gapping
Does plug gapping really make a heck of a difference?
I got the 1 step colder plugs with the stage 5 SC, but the dealer didnt bother to gap them to .035, and left them at *I think* .040
Would that .005 make that much more difference?
I got the 1 step colder plugs with the stage 5 SC, but the dealer didnt bother to gap them to .035, and left them at *I think* .040
Would that .005 make that much more difference?
The Stig
Joined: 05-11-05
Posts: 6,484
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From: New York
Originally Posted by sscobalt06
I have mine gaped at .045 with the stage 3, is that to high?
Autolite® Copper Core Spark Plugs feature a copper core center electrode sheathed in high chromium-nickel alloy for superior heat dissipation and durability. The longer insulator nose provides a longer path to control fouling deposits, and the mixture of nickel and copper-glass seal bonds the insulator, terminal post and center electrode together, assuring full voltage. In addition, the chromium-nickel alloy ground electrode resists gap erosion.
The stock spark plugs for the LSJ motor are NGK PFR6T-10G platinum plugs. Platinum and iridium plugs are much harder and more expensive metals that can last up to 100,000 miles however they are not the best metal for heat dissipation. In our experience copper based plugs are far superior in supercharged applications and while they may not last as long as platinum or iridium plugs they will offer better performance. In addition to being copper based these plugs are also one heat range cooler than stock which helps reduce the possibily of detonation and the resulting knock retard.
New spark plugs should always be gapped prior to installation. The stock LSJ spark plug gap setting is .045", and that works fine for the lower boost settings. As the boost increase, smaller plug gaps are required to prevent spark blow-out. Following are our dyno-proven LSJ spark plug gap recommendations:
Stage 1 - 3.30" to 3.20" supercharger pulley - .045" gap
Stage 2 - 3.10" to 3.00" supercharger pulley - .045" gap
Stage 3 - 2.90" to 2.80" supercharger pulley - .040" gap
Stage 4 - 2.70" to 2.60" supercharger pulley - .035" gap
Stage 5 - 2.50" supercharger pulley - .035" gap
The stock spark plugs for the LSJ motor are NGK PFR6T-10G platinum plugs. Platinum and iridium plugs are much harder and more expensive metals that can last up to 100,000 miles however they are not the best metal for heat dissipation. In our experience copper based plugs are far superior in supercharged applications and while they may not last as long as platinum or iridium plugs they will offer better performance. In addition to being copper based these plugs are also one heat range cooler than stock which helps reduce the possibily of detonation and the resulting knock retard.
New spark plugs should always be gapped prior to installation. The stock LSJ spark plug gap setting is .045", and that works fine for the lower boost settings. As the boost increase, smaller plug gaps are required to prevent spark blow-out. Following are our dyno-proven LSJ spark plug gap recommendations:
Stage 1 - 3.30" to 3.20" supercharger pulley - .045" gap
Stage 2 - 3.10" to 3.00" supercharger pulley - .045" gap
Stage 3 - 2.90" to 2.80" supercharger pulley - .040" gap
Stage 4 - 2.70" to 2.60" supercharger pulley - .035" gap
Stage 5 - 2.50" supercharger pulley - .035" gap
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Joined: 03-11-06
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From: Lake Havasu City, AZ
Originally Posted by MarcS
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Joined: 01-27-06
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From: eh
Originally Posted by player_1
so when I get pullies ( 2.8, and a 3.1 ) what should I gap my plugs to?
I have mine at .037 now and when I get the GM stage2 and 2.8 pulley put on, I have the BRK7E's ready to go in and am going to go with .037 again. JMO.
Senior Member
Joined: 05-11-05
Posts: 6,298
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From: mississauga
my BRK7E's are at .045 right now, when i get my 2.85 pulley ill see how it reacts, i hear anywhere from .035 to .045 is what people are doin, would i be better to gap them at .40 with a 2.85 pulley?
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Joined: 12-15-05
Posts: 220
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From: Canora, SK Canada
New spark plugs should always be gapped prior to installation. The stock LSJ spark plug gap setting is .045", and that works fine for the lower boost settings. As the boost increase, smaller plug gaps are required to prevent spark blow-out. Following are our dyno-proven LSJ spark plug gap recommendations:
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