sparkplug gap?

richie 2 · 08-21-2011, 08:28 PM

bbc, 3300lbs, auto w/brake, msd 7AL. NGK G groove #UR6GP. we've run them out of the box with no issues @ .040" gap. time for a new set, possiably to a .050" gap? may i have your opinion/experiance please...thanks.

Jim Kaekel · 08-22-2011, 01:54 PM

Remember that the larger the gap, the more important that the condition of the wires, cap, rotor. Since the performance benefit would be negligible, I would leave them at .040". My .02.

richie 2 · 08-22-2011, 03:06 PM

thanks jim. makes sence what your saying. i ended up talking to NGK and found that the g-groove plug is their platinum unit.....not a race plug. we've stepped up to their V POWER race plug, a touch hotter one too. the .040" gap is fine also. good cooperation from the manufacturer.

Keith 944 · 08-22-2011, 08:57 PM

don't mean to highjack thread but why does my 454 motorhome call for .060 gap? seems a lot to me... i run racecar at .045.

Jim Bailey · 08-22-2011, 09:08 PM

We're not running points anymore guys.......next time you're on the dyno with the latest ignitions, especially Digitals, try .020 - .025.(Or just put them in outta the box.) You just might like it. Ask Chuck Beach what happened when we closed his up. JB.

Joe DeMarzo · 08-22-2011, 09:12 PM

Chuck what happened when you closed the gap in your plugs?

FED 387 · 08-22-2011, 09:22 PM

something else to remember the wider the gap the more power it takes to fire the plug---also if ya run in a hot humid area ya just
might try .005 less gap just might help some--Comp

Joe DeMarzo · 08-22-2011, 09:29 PM

Does it make a differnece if you have a dish piston?

BadBanana · 09-03-2011, 12:30 AM

Quote:

Originally Posted by Jim Bailey

We're not running points anymore guys.......next time you're on the dyno with the latest ignitions, especially Digitals, try .020 - .025.(Or just put them in outta the box.) You just might like it. Ask Chuck Beach what happened when we closed his up. JB.

If he closed them up from .035 -.040 to something less and it helped,. then he had a problem elsewhere.

08-21-2011, 08:28 PM	#1
richie 2 Senior Member Join Date: Feb 2009 Posts: 963 Likes: 408 Liked 199 Times in 90 Posts	sparkplug gap? bbc, 3300lbs, auto w/brake, msd 7AL. NGK G groove #UR6GP. we've run them out of the box with no issues @ .040" gap. time for a new set, possiably to a .050" gap? may i have your opinion/experiance please...thanks.

08-22-2011, 01:54 PM	#2
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,225 Likes: 131 Liked 529 Times in 107 Posts	Re: sparkplug gap? Remember that the larger the gap, the more important that the condition of the wires, cap, rotor. Since the performance benefit would be negligible, I would leave them at .040". My .02. __________________ Jim Kaekel 3836 STK

08-22-2011, 03:06 PM	#3
richie 2 Senior Member Join Date: Feb 2009 Posts: 963 Likes: 408 Liked 199 Times in 90 Posts	Re: sparkplug gap? thanks jim. makes sence what your saying. i ended up talking to NGK and found that the g-groove plug is their platinum unit.....not a race plug. we've stepped up to their V POWER race plug, a touch hotter one too. the .040" gap is fine also. good cooperation from the manufacturer. Last edited by richie 2; 08-22-2011 at 03:10 PM.

08-22-2011, 08:57 PM	#4
Keith 944 VIP Member Join Date: Feb 2006 Location: Dela-where? Posts: 2,184 Likes: 1,143 Liked 1,854 Times in 573 Posts	Re: sparkplug gap? don't mean to highjack thread but why does my 454 motorhome call for .060 gap? seems a lot to me... i run racecar at .045. __________________ KEITH MAYERS 2-1/2 X somebody Still many X nobody

08-22-2011, 09:08 PM	#5
Jim Bailey Senior Member Join Date: Aug 2004 Posts: 673 Likes: 15 Liked 547 Times in 93 Posts	Re: sparkplug gap? We're not running points anymore guys.......next time you're on the dyno with the latest ignitions, especially Digitals, try .020 - .025.(Or just put them in outta the box.) You just might like it. Ask Chuck Beach what happened when we closed his up. JB.

08-22-2011, 09:12 PM	#6
Joe DeMarzo Senior Member Join Date: Oct 2002 Location: Mahopac, NY Posts: 666 Likes: 48 Liked 113 Times in 9 Posts	Re: sparkplug gap? Chuck what happened when you closed the gap in your plugs? __________________ Joe DeMarzo 1317 STK

08-22-2011, 09:22 PM	#7
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,399 Likes: 482 Liked 320 Times in 172 Posts	Re: sparkplug gap? something else to remember the wider the gap the more power it takes to fire the plug---also if ya run in a hot humid area ya just might try .005 less gap just might help some--Comp

08-22-2011, 09:29 PM	#8
Joe DeMarzo Senior Member Join Date: Oct 2002 Location: Mahopac, NY Posts: 666 Likes: 48 Liked 113 Times in 9 Posts	Re: sparkplug gap? Does it make a differnece if you have a dish piston? __________________ Joe DeMarzo 1317 STK