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Spark plug gap



SlowNA06 said:
The REAL answer is to gap the plugs at 0.060, run the car up to ~5,800 rpm and see if it's a problem. If it is, try 0.055. If that's not a problem, try 0.057, etc. People gap lower so they don't have to keep replacing the plugs if there was going to be a problem at a larger gap. Generally, larger gaps would get better gas mileage, but if the gap is too large, it will break-up at higher rpm.
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Excellent info - thanks.

I started @ 0.055" with my new plugs.

I used to run Champion Cu cores gapped @ 0.060". I would get misfires or knock @ higher RPM (with this "setup"). I blamed Champion - perhaps it was the gap. The cheapo Pt Bosches (not gapped design) performed flawlessly with the same setup.
 
SJAndrew said:
I blamed Champion
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Aside from the athletic wear, I don't have a single good thing to say about them. All their products are absolute trash. Their plugs are well-known to cause major issues.

SJAndrew said:
The cheapo Pt Bosches (not gapped design) performed flawlessly with the same setup.
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On the other hand, Bosch plugs are also known to cause performance issues. AC Delco, NGK and Autolite are the most-used by forum-goers.
 
i am installing a new air intake, 180 t-stat, headers, plugs and wires on mon (pully drop and pcm next month). i'm thinking al104's?...same gapping? will it need to change with pully drop? also with those mods is 3.4, 3.5, or 3.6 pully appropriate?
 
drewzilla03 said:
i am installing a new air intake, 180 t-stat, headers, plugs and wires on mon (pully drop and pcm next month). i'm thinking al104's?...same gapping? will it need to change with pully drop? also with those mods is 3.4, 3.5, or 3.6 pully appropriate?
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Depends on your car...

'97-'03 would take a 3.4" with AL104's gapped at .050"-.060", accordingly.

'04+ would need a 3.6"...Probably keep some AL605's in there honestly...you want the hottest spark you can get away with...not the coldest.
 


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