6510 - LTR7IX-11 - Iridium IX Plug, 14mm Thread, 25mm (.984") Reach, 5/8" (16mm) Hex Size, Tapered Seat, Resistor, Projected Tip, Solid Terminal, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .044" (1.1mm) Gap, Heat Range 7 5107 - LZTR7AIX-13 - Iridium IX Plug, 14mm Thread, 25mm (.984") Reach, 5/8" (16mm) Hex Size, Tapered Seat, Resistor, Extended Projected Tip, Solid Terminal, Extended Shell Hex, Projected Core Nose, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .050" (1.3mm) Gap, Heat Range 7 Difference is in yellow bold on the 5107's...can anyone tell me what that means? I've read where you need a special socket to use the 6510's on a HEMI...do the 5107's solve that issue?
Kyle, "Special Socket"??? I have been using the 6510's for over three years and I never had to buy a "Special Socket". Who told you this? Were they drinking the bong water when they told you? haha Can't answer the question about the difference between the two plugs. All I can say is that most are using the 6510's, why deviate? I did, once, use the Copper plugs. They were good, but just didn't seem like they lasted very long?
Ron... I think that he is talking about this one... http://buy1.snapon.com/catalog/item...&group_ID=1345&store=snapon-store&dir=catalog it is extra deep!!! I have one and it works great... no extenstions to worry about or anything... but pretty costly...
One place i read it was on LX forums...old post from Lou, back in 07: And i saw where Tim posted this: And i read it somewhere else over the weekend...something about the hex part isn't as long and you may not be able to properly torque the 6510's???? I'm fine with it as long as you're sure...i just don't want to have to return and reship and wait if they don't work properly.
Good enough for me boss...thanks for the help...If I have to order a gawd damn special socket, im'a kick yo ass!
If it helps, I just called NGK about something else and asked them what to use for 2 steps colder on an SRT8 and tech told me the 5107s.
I also use a 6510.2 steps colder.Gapped to 032(n20) No special socket needed.Just installed them last week..
The main difference is the overall length. The 6510's are a little shorter than a stock plug, and the tip isn't as projected...the 5107's are identical to the stock plug in dimension, and projection...just 2 ranges colder than a stock plug. The 6510's will work, but for N/A motors, they recommend the 5107's and usually the 6510's for forced induction, being the tip isn't as projected, it helps with possible blow out problems. Bottom line, they both work. 5107's for N/A 6510's for F/I Discussed my KR issue with the tech guy, he felt like I was making a good decision and if I still see KR with the new plugs gaped at .045, I should lessen the gap until it quit or lessened and recommended not to go tighter than .035. I'll order them and see what happens. Thanks for the discussion guys.
i know, so why do i need two heat ranges colder? Only answer i can come up with: I've read where iridium plugs run hotter than an equivalent copper plug...meaning two plugs of equal heat range, one being iridium and the other copper, the copper plug will operate at cooler temps than the iridium. My specific compression, head , intake and cam combo may require 2 ranges colder iridium where others get away with 1...I really hope this fixes my KR, or reduces it greatly. Leaving 10 degrees of timing on the table, i'm missing out on ALOT of power. Edit: Taking the rule of thumb 1 heat range colder per 100hp...come to think of it, i'm well over 100hp increase. More likely around 150-175hp increase...so two steps does make since.
Well.......if you are 425 crank stock you think you are only 525 crank now? I just got heat range 5 plugs for mine which is 2 colder than stock and 1 colder than a 6.1 and I think I need to go to heat range 6 judging by my MPH.......we'll see.....I got copper plugs.
No intentions to "jack" someones thread but may i ask you guys(because i have no clue at all) what plug i should use or stay with the stock plugs. As we speak andy(formerly with PPP) now PWR has my intake manifold for porting/polishing and coating. I am going to be buying his stage 3 heads with the 224R cam. I have the kooks catless in the storage room. I already have the underdrive on,corsa exhaust,no cats,170 thermo. At this point of my build(slow at that but making progress) should i go 1 step colder on the plugs? If you feel i should may i ask what plug?
Was that in response to my post Hemi31? If so, is that stock or one "colder" excuse my lack of knowledge.:dumb:
