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Post by 358t on Apr 27, 2014 20:16:17 GMT -6
What part # spark plug?
Scott
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Post by racerone on Apr 28, 2014 5:47:50 GMT -6
What part # spark plug? Scott Scott They were ngk number 9 range I don't know part number. But the new ones for last couple weeks have been R5671A -10 I have heard conflicting opinions on heat cold range with Alky and 12.7 compression running with MSD . We have been shortening the gap from 45 to 35 now this weekend 25 but thats a opinions offered also . Thanks DR
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Post by oneomega on Apr 28, 2014 7:08:37 GMT -6
What part # spark plug? Scott Scott They were ngk number 9 range I don't know part number. But the new ones for last couple weeks have been R5671A -10 I have heard conflicting opinions on heat cold range with Alky and 12.7 compression running with MSD . We have been shortening the gap from 45 to 35 now this weekend 25 but thats a opinions offered also . Thanks DR Don, I have a bit more compression but have always used 8 heat range - tried 10's and the car missed...remember helping out Shankenator (sp) by giving him a set of #8's and it solved his issue.
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Post by dennismopar73 on Apr 28, 2014 7:18:17 GMT -6
Jmo, you got a handle on it , Bob n Gary, get er fixed
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Post by ab5098 on Apr 28, 2014 7:44:33 GMT -6
IMO that plug is too cold I think you should have a -8 plug in there . I run -8 in both my engines gapped at .025 The higher the number the colder the plug on NGK. But you know what they say about opinions .......................................
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Post by dennismopar73 on Apr 28, 2014 7:55:10 GMT -6
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Post by 358t on Apr 28, 2014 8:04:56 GMT -6
Don, thanks for the info. One omega and ab5098 are thinking the same thing I was gonna say. Your compression is not that high and it isn't a 1000hp engine. A -10 is for blown or nitrous. Even the blown engines under 15psi boost prefer the 9 heat range. If you have the room go with the extended tip version -8 plug. I think the part # is r5672a-8 or if you prefer autolite get the ar3911. Leave them gapped what they are out of the box with is right around 28 thou.
Scott
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Post by sg3526 on Apr 28, 2014 10:17:19 GMT -6
Go to O'Riellys and get a set of 4554 NGK's, have ran them on everything from my Small Block 12.5 to 1 motor to my 15 to 1 582. Never miss a beat.
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Post by oneomega on Apr 28, 2014 11:31:39 GMT -6
Don, thanks for the info. One omega and ab5098 are thinking the same thing I was gonna say. Your compression is not that high and it isn't a 1000hp engine. A -10 is for blown or nitrous. Even the blown engines under 15psi boost prefer the 9 heat range. If you have the room go with the extended tip version -8 plug. I think the part # is r5672a-8 or if you prefer autolite get the ar3911. Leave them gapped what they are out of the box with is right around 28 thou. Scott +1 for sure on not only the #8 but extended tip! I ran extended tips until piston clearance became an issue. I know it's a PITA and may be overkill but I also index my plugs.
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Post by dennismopar73 on Apr 28, 2014 12:53:28 GMT -6
Go to O'Riellys and get a set of 4554 NGK's, have ran them on everything from my Small Block 12.5 to 1 motor to my 15 to 1 582. Never miss a beat. Thats wa R 5 6 71 A 8 Isn't that the same plug LOL He has run a 10 now a 9. I would see no diff in that change!
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Post by dennismopar73 on Apr 28, 2014 12:56:25 GMT -6
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Post by 358t on Apr 28, 2014 13:04:33 GMT -6
Go to O'Riellys and get a set of 4554 NGK's, have ran them on everything from my Small Block 12.5 to 1 motor to my 15 to 1 582. Never miss a beat. Thats wa R 5 6 71 A 8 Isn't that the same plug LOL He has run a 10 now a 9. I would see no diff in that change! I think he said he went from a -9 to a -10 which was the wrong direction. Either way they were both too cold. It may not be his problem but it isn't helping using a non projected tip cold plug. Scott
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Post by dennismopar73 on Apr 28, 2014 13:04:46 GMT -6
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Post by dennismopar73 on Apr 28, 2014 13:06:05 GMT -6
No you guys wrong Going up on ngk is going colder The lower number is hotter
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Post by dennismopar73 on Apr 28, 2014 13:23:55 GMT -6
A 4554 plug , and a r 5671 a is the same plug Depends on whom sells that plug as to that part number sold under. The heat range is determined by the last numbers 8-10-11. 11 being the coldest , 8 being hottest. heat range on a plug only deals with temp taken away from the tip to keep proper firing , not actual fuel burn . The reason most change temp range on a plug is to overcome fuel issues , and oil contamination, to allow a cleaner burn.
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