Spark Plugs?

[joshheat25]

I am going to change the spark plugs on my 2000 GT and was wondering what brands to get and what type.

 

[Go HoTO!]

I am going to change the spark plugs on my 2000 GT and was wondering what brands to get and what type.

If you are staying n/a, the two best options are either copper or platinum. Copper will give you a better spark, but platinums will last longer, so that is up to you.

I use Autolite Coppers. Model 103, but I have nitrous and they are one heat range colder than stock.

 

[joshheat25]

I would probobly get the Autolite platnums

 

[HIGDON]

Autolite 764's

 

[joshheat25]

any other brands that are good for performance and longevity!

 

[CanadaStang]

any other brands that are good for performance and longevity!

MOTORCRAFT

PART# / HEAT RANGE
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Hea range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

NGK

PART# / HEAT RANGE
TR-55/ 3951/ Stock Heat Range
TR-6/ 4177/ 1 Step Colder
BP7EFS (PN - 3526) BR7EF (PN - 3346) two steps
R5724-8 (PN - 7317) two and a half steps
R5724-9 (PN - 7891) three steps
R5724-10 (PN - 7993) four steps

AUTOLITE

PART# / HEAT RANGE
764s / Stock
103s / 1 heat range cooler
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler
Rumour has it that copper is a better conductor than platinum, and give an edge in HP over the platinum plugs, but don't last as long. I've never been able to find any dyno # that will back this up, but the general concensus has it that copper performs better.

 

[joshheat25]

How much longer does platnum plugs last over the copper and does anyone have any noticable performance gains with copper!

 

[CanadaStang]

How much longer does platnum plugs last over the copper and does anyone have any noticable performance gains with copper!

The platinums will generally last about twice as long as copper, say 30,000 miles for the copper and 50,000-60,000 miles for the platinum

 

[joshheat25]

thanx I will go with platnum!

 

[CanadaStang]

The stock plugs are Motocraft AGSF32PM
The lower the number the colder the plug.

 

[tomustang]

thanx I will go with platnum!

just don't gap the platinum plugs

 

[Darkhorse845]

Motorcraft platinums are a great choice!

 

[joshheat25]

Don't Gap the Platnum Plugs?

 

[bdcardinal]

nope, platniums are supposed to come pregapped. if you stick the gapper in there you can damage the contacts. i just use Autolite 764 coppers. i dont mind changing out the plugs. believe me, even a 4.6 GT is cake compared to some of the other cars ive had to work on. anyone here ever done the plugs on a 911 turbo or a 996.

 

[Darkhorse845]

Don't Gap the Platnum Plugs?

No need to.
They already come pregapped my friend!

 

[RTRMustangGT]

What do most people gap the copper plugs to on a n/a GT?

 

[bdcardinal]

.054" thats what the book says.

 

[StangYellow]

The platinums will generally last about twice as long as copper, say 30,000 miles for the copper and 50,000-60,000 miles for the platinum

I have to disagree with the copper statement. I have been buying copper plugs for 2 years now, and I put around 7-8K on my car each summer. Every year around June the car starts bucking, and will sometimes slow down going up hills. Thats because the plugs are fouled out, or have just worn out. I have since switched back to the stock plugs.

Maybe its just my car, but i dont see copper plugs going for more than 10K miles. They are as cheap as the stock Autolite/Motorcraft plugs. But from experience, its cheaper to stick with the stock heat range plugs, and get the longer milege out of them

 

[CanadaStang]

I have to disagree with the copper statement. I have been buying copper plugs for 2 years now, and I put around 7-8K on my car each summer. Every year around June the car starts bucking, and will sometimes slow down going up hills. Thats because the plugs are fouled out, or have just worn out. I have since switched back to the stock plugs.

Maybe its just my car, but i dont see copper plugs going for more than 10K miles. They are as cheap as the stock Autolite/Motorcraft plugs. But from experience, its cheaper to stick with the stock heat range plugs, and get the longer milege out of them

What copper plugs were you using? If you change to too cold a plug, they will foul quickly, as the plugs won't get hot enough to burn off deposits. Unless you raise compression or install a power adder you really won't need to go to a colder plug.