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Motorcraft SP-514 spark plugs

Old 11/2/11, 09:46 PM
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Motorcraft SP-514 spark plugs

Would anyone happen to know if the design of the SP-514 spark plugs are a one piece design, or are they the same two piece plug with an updated part number ? I tried doing a google search and could not find any comparisons between the SP-514 over the previous SP-462 that Ford replaced it with
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Old 11/2/11, 09:57 PM
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It is a one piece design that replaces the problematic design of the first factory plug.
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Old 11/3/11, 01:17 PM
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When did this plug come out?

JR
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Old 11/3/11, 05:51 PM
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From my understanding, it's been out awhile now as the previous SP-462 part number is no longer available.. However I did look at the SP-514 plug at my local dealership today and it seems to look as though it's still a 2 piece design plug
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Old 11/3/11, 05:54 PM
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Originally Posted by m05fastbackGT
From my understanding, it's been out awhile now as the previous SP-462 part number is no longer available.. However I did look at the SP-514 plug at my local dealership today and it seems to look as though it's still a 2 piece design plug
The design still looks the same but its the internal that is supposed to be different.
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Old 11/3/11, 08:29 PM
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Hey Trent ! by any chance would you happen to know which part of the internal design is different.. Thanks much, Rocky
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Old 11/3/11, 08:43 PM
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Originally Posted by m05fastbackGT
Hey Trent ! by any chance would you happen to know which part of the internal design is different.. Thanks much, Rocky
I'm not sure because I haven't had one break on me yet lol. I'll see if we have an old one lying around in the shop and ill bust it open and take a look ill take pics so you can see too
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Old 11/3/11, 08:56 PM
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Hopefully your comparision pics will confirm they're a one piece designed plug and if they are ? Ill be having the old SP-462 plugs replaced soon enough
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Old 11/3/11, 09:04 PM
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Originally Posted by m05fastbackGT
Hopefully your comparision pics will confirm they're a one piece designed plug and if they are ? Ill be having the old SP-462 plugs replaced soon enough
How many miles are on your car?
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Old 11/3/11, 11:08 PM
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20,848 miles
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Old 4/15/19, 02:50 PM
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Anyone know if the newest SP547 plugs are any good for a 2005 GT? I can find SP514 which I believe replaced the SP462, but SP547 shows as a replacement for both. SP514 are listed as nickel while SP547 are listed as platinum.
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Old 4/16/19, 03:32 PM
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Originally Posted by biznazion View Post
Anyone know if the newest SP547 plugs are any good for a 2005 GT? I can find SP514 which I believe replaced the SP462, but SP547 shows as a replacement for both. SP514 are listed as nickel while SP547 are listed as platinum.
After doing a google search, the SP547 spark plugs are Ford/Motorcrafts improved design over the previous SP514 which supposedly are less prone to breakage. However, they remain unchanged as a 2-piece design and are made in Mexico. Therefore I would stay as far away from these plugs as possible. IMHO this is just another fine example of Ford's marketing hype at work lol.
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Old 4/16/19, 04:28 PM
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Originally Posted by m05fastbackGT View Post
After doing a google search, the SP547 spark plugs are Ford/Motorcrafts improved design over the previous SP514 which supposedly are less prone to breakage. However, they remain unchanged as a 2-piece design and are made in Mexico. Therefore I would stay as far away from these plugs as possible. IMHO this is just another fine example of Ford's marketing hype at work lol.
Thanks for the additional info. I thought the electrode was different in them, but I've seen boxes of SP514s marked with 'finewire platinum' so who knows. I'll pick up a set of 514s.
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Old 4/16/19, 09:09 PM
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Originally Posted by biznazion View Post
Thanks for the additional info. I thought the electrode was different in them, but I've seen boxes of SP514s marked with 'finewire platinum' so who knows. I'll pick up a set of 514s.
Personally, I'm not fond with any of Ford/Motorcraft's 2-piece design spark plugs. If my car didn't require one degree colder spark plugs, I would've made the switch over to MSD's 1-piece design plugs. However, being that my car is FI and requires a one degree colder spark plug, I use nothing but Autolite HT0 spark plugs, despite being a 2-piece design.

Last edited by m05fastbackGT; Yesterday at 04:08 PM.
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