What causes spark plugs to be orange?

[Buck531]

Like the title says.

 

http://bucky.kicks-ass.net/pics/plugs

 

These are Auto Lite 605's. Gapped to .060. I've had them in the car since Octoberish.

 

The orange ones, are in the rear bank ONLY . The white ones, are in the front.

 

Any ideas?

[Tractor]

Those are really good looking plugs. If I had to guess it would be heat.

I'd be willing to bet that the front of the engine stays slightly cooler than the back or the side opposite of the radiator inlet. I'd leave them alone. They aren't gonna help your car be faster, but I know how tinkering goes as well so do what you want. If you do replace them keep a few for spares.

 

Evan

[Buck531]

I already put in AL 104's when I took these out. The 605's were giving me some knock (too hot of of a plug for my setup).

 

The car is definatley NOT stock .

[Tractor]

That was probably the problem then. Just to hot for the timming and all that.

 

Evan

[Buck531]

That was probably the problem then. Just to hot for the timming and all that.

 

Evan

yeah, that's what I was thinking.

[Guest Removed]

He is right, the rear bank has to take all the heat from the front bank because of the crossover setup they have on the exhaust. They only had that problem on the supercharged engines that had other upgrades.

 

Are they making long tube headers yet?

[Guest 78novaman]

Yup, too hot. You just need to get a different heat plug for the rear bank then it should be all good

[Guest racinbird]

maybe this can give some help

http://www.maxracesoftware.com/spark_plugs.htm