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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 03-22-2015, 02:42 AM
watajob watajob is offline
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Default Knowledgeable/experienced answer needed...

OK
I've searched here 12 ways to Tuesday and Googled the snot out of the question: Can the lower Bosch Iridium plug be used for the upper Bosch Copper plug to extend service intervals with no damage/performance issues? Or, is their an Iridium plug of a different brand of correct size/configuration/heat range that might also do the trick? Id love to hear directly from folks that have done it and what their results were. Thanks.

Last edited by watajob; 03-22-2015 at 02:52 AM.
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Old 03-22-2015, 01:27 PM
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hydrex hydrex is offline
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All I can tell you, my experience with Denso Iridium plugs in my hemi. It runs better with Champion Copper plugs. I have 99,000 miles on the Champions in my hemi Magnum wagon. My secret: gap them 10 thousands closer than spec. When I pulled the Iridiums at 100,000 miles, the end of the plugs were missing. Pulled a Champion at 90,000 and still looks good! I run 1 range colder plug than spec also, no issues with cold weather, I spray nitrous at the track.
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Last edited by hydrex; 03-22-2015 at 01:30 PM.
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Old 03-22-2015, 01:48 PM
Hornet Hornet is offline
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Just to add to Hydrex's post about closing the plug gap up,it actually adds a little bit more timing .
A tighter plug gap takes less spark energy to jump the gap,so the coil saturation period is shorter,which effectively adds timing to the engine.
As long as you have a big enough spark to ignite the air/fuel mixture it usually adds a bit to the power,nothing you'll be able to feel by butt dyno though,but enough it'll sometimes be noticable on an engine dyno.
It used to be a common trick back in the days of single coil ignition systems,not as common now with multi coil systems,as the gain isn't as noticable on the later multi-coil systems
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Old 03-22-2015, 08:32 PM
watajob watajob is offline
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Good info. But, I'm still looking for a 4.7 owner that's been there and done that. Us old men don't like taking chances!
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Old 03-22-2015, 08:51 PM
Hornet Hornet is offline
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I think Snursak tried it,or was gonna try it,but don't quote me on that.
Hopefully Sean chimes in soon

I'm not close to plugs yet,so i haven't even gave the idea any thought .
I had mine all out and checked their gaps before the truck went on the dyno,but that's as far as i've gone on plugs
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