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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.

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Old 4/24/19, 01:33 PM
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My car has a JLT intake and tune, but no FI. I've been leary of using any plugs other than the motorcraft ones - do the MSD's run well in NA'd 2005's?
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Old 4/24/19, 01:57 PM
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Just knowing their a one-piece design plug and having piece of mind that they won't separate/break when it comes time to change them, would be more than reason enough for making the switch. Also, MSD has been in the performance industry for many years and has an excellent reputation for producing top quality products. The bad news however is, the MSD spark plugs are only available in Iridium and not platinum. Therefore if that happens to be a deal breaker for you? Then you might want to consider sticking with OEM Motorcraft
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