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Spark Plug Change - How To?

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  #21  
Old 06-27-2015, 08:46 AM
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Originally Posted by Bigg Will
I'm posting the this and more as "5.0 SC, XFR"s" Sparkplug Change".
Thanks for the pics. can yo expand how you removed the long rubber part that
goes on top of the coils?
 
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  #22  
Old 06-27-2015, 01:22 PM
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Originally Posted by Rique
Thanks for the pics. can yo expand how you removed the long rubber part that
goes on top of the coils?
Checking to make sure I was not caught on any wires, I heated them with a heat gun, pulled and tugged on them until they came loose.
 
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  #23  
Old 08-15-2018, 11:31 AM
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#1. I want to get this Champion or Denso Iridium plug one heat range colder than these. How do I find that plug? What is the stock heat range? What are the part numbers?
 
Last edited by Benjamin Jerome Smith; 08-15-2018 at 11:40 AM.
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  #24  
Old 08-16-2018, 11:34 AM
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Actually the other way around. One heat range hotter. I was thinking it was backwards. Hotter plugs can handle more heat.
 
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  #25  
Old 08-16-2018, 03:28 PM
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Why do you think you need to change the spec?

Champion:Champion indicates the heat range in the middle of the plug number. For example, RV15YC6 has a heat range of 15. (The 6 at the end of this part indicates the Gap setting.) Champion plugs are hotter the higher the number, colder the lower the number. Starting with part # RCJ7Y (Heat Range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (Heat Range 8).



Denso:Denso indicates the heat range in the middle of the plug number. For example, SK20PR-A11 has a heat range of 20. The number at the end of the part indicates the Gap. Denso Iridium Power plugs feature the Heat Range at the end of the part number. For example, IK20 has a Heat Range of 20. Denso plugs get colder the higher the number, hotter the lower the number. Starting with part # IK20 (Heat Range 20), a colder plug would be # IK22, a hotter plug would be # IK16.
 
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  #26  
Old 08-17-2018, 02:56 PM
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I have changed sparkplugs on my xf 4.2SC to Bosh double platinium after car clocked 160 000miles. Bosh double patinmium was good up to 3km, then I give car WOT and recticeted performance and misfires. took them out, 3 of them were dead. changed them to NKG LPG Laserline, 10000 miles no problems. I would avoid Bosh in that car
 
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  #27  
Old 08-17-2018, 06:00 PM
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Yep, I would avoid Bosch (and Champion and Denso), from my reading by far the best plug for both the 4.2 and 5.0 V8 is NGK Iridium.
 
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  #28  
Old 08-20-2018, 09:21 AM
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Originally Posted by Norri
Why do you think you need to change the spec? I plan on getting tuned with the Arden Headers with a full header x-pipe exhaust setup with pulleys. I also plan on tracking the car at Daytona and Sebring late this year and next year. I have done some research and read articles that Jaguar engineers puts the hottest plugs they can get away with for emissions reasons from the factory. So that being said, A plug that is too hot for the power you are making will set off pre-ignition in the cylinder. If I am going to go from 440whp to ~560whp, that should be plenty enough heat to make the factory plugs cause pre-ignition, especially on a big power track like Daytona or Sebring. So to be safe I want to get one or two ranges higher heat handling plugs if that makes sense to have insurance I wont cause pre-ignition on a 20 min session on a big power track.

I was looking at the Denso Iridium Twin Tip plugs, https://www.ebay.com/itm/Set-of-8-Spark-Plugs-Iridium-TT-Long-Life-DENSO-Twin-Tip-4711-Made-in-USA-V8/332462017392 but I don't see any of those heat range numbers in there. Ideally I would like a .040 gap with a one or two range colder plug.

Champion:Champion indicates the heat range in the middle of the plug number. For example, RV15YC6 has a heat range of 15. (The 6 at the end of this part indicates the Gap setting.) Champion plugs are hotter the higher the number, colder the lower the number. Starting with part # RCJ7Y (Heat Range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (Heat Range 8).



Denso:Denso indicates the heat range in the middle of the plug number. For example, SK20PR-A11 has a heat range of 20. The number at the end of the part indicates the Gap. Denso Iridium Power plugs feature the Heat Range at the end of the part number. For example, IK20 has a Heat Range of 20. Denso plugs get colder the higher the number, hotter the lower the number. Starting with part # IK20 (Heat Range 20), a colder plug would be # IK22, a hotter plug would be # IK16.
 
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  #29  
Old 08-20-2018, 10:49 AM
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So you'll be looking for a colder plug?
 
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Old 08-20-2018, 11:35 AM
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Originally Posted by Norri
So you'll be looking for a colder plug?
yes sir
 
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  #31  
Old 08-23-2018, 06:16 AM
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Deleted. Where is the post delete button?
 
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  #32  
Old 08-23-2018, 10:29 AM
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Seized plugs? Never had that on a jaguar in 21 years. Or any other car including the seized plug syndrome prone engine on the ford v10 in my motorhome. Yes i believe in god
 
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