Good long lasting spark plug?

[98blackstallion]

What a good long last spark plug guys? I have autolite 764's right now and I was looking to get a plug that last quite abit longer due to the headache getting sparkplugs out of my motor. Due to the CPR fuel rails and p-51 intake. I know everytime I take them out and put them back in that they crossthread alittle bit and its starting to worry me. If you guys can help me I would greatly appreciate it.

 

[Killa]

Then go with motorcraft plantium.

 

[98blackstallion]

whats the number on those?

 

[COramprat]

Any platinum plug will suffice. Depends what you want to spend.

 

[Mustang5L5]

Stock motorcraft platnium plugs. SP-493's

 

[the98stang]

What do you mean a "headache"? You should be able to swap them all out within an hour, while drinking a few beers

Seriously though, the platinums aren't worth it IMO. Just get copper NGK's or Motorcraft and swap them out every 8-10k.

 

[98blackstallion]

Its very hard to get the plugs out or in straight with the CPR rails and the P-51 intake and Im worried that I'm eventually gonna ruin the threads in some of the holes. To do that job I pretty much have to remove the fuel rails and what not just to get the plugs out and that makes it a PITA I think. To do that job correct I need a case of beer LOL..But the thing is, is that I prefer copper plugs but they just done last new as long as I would like. What is the motorcraft copper plug Part #

 

[Mustang5L5]

The copper plugs are technically a better plug for performance but the OEM plug for the 4.6L was a plat plug. The ignition system has been designed for it so technically the differences between copper and platnium is very very miniscule on the 4.6L

The 5.0 on the other hand came OEM with copper plugs and an ignition designed for it. As a result, they tend to be finicky with platniums.

I usually say if the car came OEM with plats, they should be fine with plats. That usually applies to daily driver or stock cruiser type cars. Guys with high HP mods, or other serious modifications won't want a plat plug however....and i don't blame them.

I still have the OEM plats in my car at 57K miles. I have a new set ready to swap in, however my car stills idles smooth as silk and doesn't misfire under load in 5th gear...so i'm in no rush to change them. If i had coppers, i would have had to change them 5 or 6 times already.

It's really up to you and what you think is right for your car

 

[98blackstallion]

Thanks for clearing that up Sir! I think I'll go back to platinums then!

 

[Smokeurhonda]

Stock platinum is the way to go for longevity.

 

[99MustangGTVert]

Platinum for longevity, copper for performance. Copper is a better conductor of electricity after all.

 

[Mustang5L5]

Silver is the best, but i don't beleive they make plugs that would fit a Mustang....yet.



They do have silver plugs though

http://www.nology.com/silver.html

 

[99MustangGTVert]

Silver plugs for a mustang:

http://www.steeda.com/products/brisk_spark_plugs_silver.php

 

[Mustang5L5]

Ah, so they are avail for Mustangs now.


I know silver is better than copper, but is it worth $80 in plugs??

 

[98blackstallion]

there cant be that much of a difference between all plugs

 

[joshjwc9]

The copper plugs are technically a better plug for performance but the OEM plug for the 4.6L was a plat plug. The ignition system has been designed for it so technically the differences between copper and platnium is very very miniscule on the 4.6L

The 5.0 on the other hand came OEM with copper plugs and an ignition designed for it. As a result, they tend to be finicky with platniums.

I usually say if the car came OEM with plats, they should be fine with plats. That usually applies to daily driver or stock cruiser type cars. Guys with high HP mods, or other serious modifications won't want a plat plug however....and i don't blame them.

I still have the OEM plats in my car at 57K miles. I have a new set ready to swap in, however my car stills idles smooth as silk and doesn't misfire under load in 5th gear...so i'm in no rush to change them. If i had coppers, i would have had to change them 5 or 6 times already.

It's really up to you and what you think is right for your car

My car doesn't misfire in 5th gear, but it tends to put a vibration throughout the whole car when I let off of the gas right at 50mph in 5th. My car has OEM plugs at 101k miles and has stock gears as well. The car also does it going 35 in 4th.

 

[98blackstallion]

Good lord man!

 

[98blackstallion]

Good lord man!

 

[Mustang5L5]

Holy crap. 101K miles on stock plugs?

Even if it's not the cause of your probs, i think you are past due on changing them!

 

[joshjwc9]

No, no..lol they were replaced with whatever comes stock on it.

It just seems as though the vibration happens at those speeds and I was wondering if it happened to you as well.