what's the difference between hot type spark plugs and the cold ones? I am just curious ..if there is a difference in the performance.
thanks

 

Correct me if Im wrong... but I thought hot plugs are for diesel engines.

 

wel if you get on [http://www.courtesyparts.com/onlines...j30_oem_tuneup]
that is for the VG30E engine and i think our engines are gas aren't they?

 

Here is your answer straight from the Chiltons Maxima Repair Guide:

Hot Type - for use under a great deal of stop and go driving

Cold Type - for use if most driving is long distance and high speed travel.

Also for your FYI - Spark plug heat range is the ability of the plug to dissipate heat. The longer the porcelain piece(insulator) of the plug is, the further in the engine the plug goes: the hotter it gets. The shorter the plug, the easier it is cooled in the engine blocks cooling passages.

 

so if I wanna tune up my car....which one should i get..considering i do 50/50 city/highway travel?

 

[QUOTE]Originally posted by wizard6161
so if I wanna tune up my car....which one should i get..considering i do 50/50 city/highway travel? [/QUOTe_

I recommend the cold type for you, i would only recommend the hot type if you lived somewhere like L.A or San Diego and only drove in the city. I hope this helps you, you should strongly consider paying for the NGK plugs from the nissan dealer-seriously!!

 

The standard heat range plug, with a reasnoably stock engine (no: turbo, SC, high compression pistons, cams, etc.) is wide enough for any but the most extreme drivng conditions. Computer controlled fuel injection will keep plugs from fouling in heavy city driving. Unless you left the engine idling all day, I wouldn't put in a hotter range plug.

 

lol @ the Chilton response.

There's no need for you to go with anything other than the standard heat range. You only need a colder plug if you throw on a NOS kit or any other forced induction mod that gives you another 100 hp.

Don't put a hotter plug cuz you'll probably end up detonating.

 

Just today I indexed my spark plugs, I can see a difference but I wish I had the oportunity to dyno before and after to see the actual results. I used CSI (I think thats the name) I was gonna get Moroso but they were like four bucks more. I got the CSI for $16 after tax. a 1-2% increase means around a 3HP increase for the ve engine, a worthwhile prodject I'd say.