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08-24-2009, 06:38 PM
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#1
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Registered Member
Join Date: Jun 2008
Posts: 48
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From what I could tell on LaPointe's site a larger hole wasn't any more efficient than a smaller hole. The smaller hole lasts longer. I think your hole is too large and the plug will wear out too quick. The hole interferes with the cooling so the tip will run much hotter than it is supposed to.
Harbor Freight 94606 has the right size drills.
An automatic center punch will smash the electrode in. A drywall screw will dent the metal just enough to get the drill to start though I have a drill press.
I've tried but Halo plugs for my cars are never available.
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08-25-2009, 06:19 AM
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#2
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Registered Member
Join Date: Nov 2007
Posts: 1,111
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What about just chopping the ground strap back so it only covers half the center electrode? That's an old performance mod that gets rid a lot of the quench area that this precision drilling is supposed to do.
__________________
- Kyle
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08-25-2009, 07:04 AM
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#3
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Registered Member
Join Date: Feb 2008
Posts: 1,652
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There was another recent thread on sidegapping... on Marvin, idle quality wasn't so good, bit better pull above 2000 though, mpg wise less than 5% difference, or I'd have noticed.
__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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08-28-2009, 07:47 PM
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#4
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Junior Member
Join Date: Jul 2010
Posts: 23
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I have completed my indexing and drilling mod to my existing Denso Iridiums. I will report back when I have several tanks of gas burned up. I have been averaging 16.5mpg in 70% city driving.
For those of you with Tundras or any other truck, what mods have you done in order to increase FE?
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