Wow... bought 8 from them in 2020... shipped to US, all 8 were total of about 38 British pounds...

 

I thought that jaguar had and equivalent plug but it's a "5N" and not a 7N part number, I must be confused. I think I'll go with alternatives but even Rock auto does not stock that equivalent plug listed above but I did find them on Ebay.
just my l luck 😪

 

I believe the Jaguar OEM Number for these plugs is C2C41805.

 

was just perusing and ran across this...

 

I have a brand new set of OEM Aston spark plugs from RedPants but haven’t had the time to install them.

How tough was the install?

 

it was fairly easy, the back one I had to use universal joint but overall it took me less than 1hr to do all 8 plugs.

 

Do you sense a difference in the way the engine runs?

Just curious ... Preventative maintenance is always the thing to do but I am interested in anything you noted ....

 

No not really any difference, my old plug were still really nice but with the car going on 80k km I thought it was a good thing to change them and maybe it will help gas millage a bit. lol

 

plugs last a whole lot longer what with modern computer regulated fuel injection and all... however, they will ablate and as a consequence the gap will increase. as an example, i recently installed some new plugs on a 2001 ram pickup i've owned since new. i'd never changed the plugs and the tips had ablated to the point the the gap was about haff again as wide as it should have been. the truck had about 70-80,000 miles on it.

 

I've always used Champion plugs in my cars (including my e39 M5) because they've always been great product for the price. My car is closing in on 50k miles, and I figured it would be a good time to change them, so I ordered a set of Champion iridium 9801 plugs (RC8WYPB3) from Amazon a couple weeks ago. RockAuto has them for just under $6 each, but Amazon has sets of 4 for $10.

I haven't checked the gap and installed them yet, that's my job for this weekend.

 

Thanks for sharing. How did you cross reference for compatibility?

 

They're listed on Rockauto, sparkplugs.com, and Summit as compatible with the 4.7L Vantage. I checked the specs for both on various websites. Both are 14mm x 1.25 thread with 19mm reach, iridium middle electrode, platinum ground, similar RIF damping, and gasket seat.

The only difference is spark position (how far the gap between the electrodes extends from the plug body into the combustion chamber). The OEM NGK plugs have a 3.5mm projection while the Champions have 3.0mm. The half millimeter is negligible, I think, in a modern engine (3mm and 3.5mm are both considered projected-tip plugs)​​​​​​, but I guess I'll find out when I install them and dyno the car.

 

Got it! Thanks again.

 

I wouldn't be surprised if this dimension does make a difference, since tolerances are every complex when the piston is TDC when the spark ignites...

Just my thoughts

 

Yeah, I'm aware that not all "interchangeable parts" are actually compatible.

I'll let you know after I install them. I plan to take the car down to Jacksonville for dyno runs, but scheduling takes a while. The place I go to is usually booked 3 weeks in advance. And I'm not going to schedule that until I have the plugs in and perform a butt dyno first.