i found a guy that would sell me a set of denso irridiums for $36 out the door... i never really cared to change my plugs, but from what i hear thats a great deal! i know that the ik24's are a cooler plug, but i dont know what the benefits of having cooler plugs are. so can someone please tell me why its better to have cooler plugs ik24's over the regular ik22's? also it it possible for me to gap the denso's to spoons specs? if so what are the spoon plug specs?
thanks
mike

 

Denso recommends the 22 and Spoon the 24. Members on this board have had success with both and I think the super charged cars are using the cooler plug. They are not hard to gap but don't put any pressure on the electrode because it is very thin. .044 seems to be the gap most people are using.

 

The rating of the plug (hot/cool) has to do with the ceramic design and how much heat it transfers away from the electrode. Too cool will be subject to fouling, too hot will prompt detonation. There is no 'advantage' to a particular temp range but rather a 'disadvantage' to the wrong one. 22 is probably fine for most driving, 24 is recommended for extended loads / track use.

 

Try the IK24, I've had good times with it.
Better fuel economy and better acceleration were observed.
Subtly better but still better.

I am soon putting in IK27 since I am supercharged with smaller pulley.

 

IK 24..... like they said...and look who "they" are .

Utah

 

Whichever way you go (22 or 24) be sure to re-gap them. Both sets I've gotten were gapped to around .027", far too small in most of our opinions (.045 is more like it). Also, be aware that they'll need replacement much sooner than platinum plugs -- about every 10K mi.

 

 

The latest high performance plugs come with very thin center electrode and a grooved ground electrode that promotes a hotter spark without increased current. This is true of many of the new alloy plugs, not just the iridium plugs. The edges on these plugs should be carefully examined about 10K miles looking for deterioration of the sharp edges that will reduce performance. Very long life plugs are made with iridium as well as platinum, but these have heavier electrodes designed to last over 120K miles, not produce the hottest spark. Denso makes both kinds.

 

Denso recommends replacement at 30,000 miles. Has anyone had to replace them earlier?

 

I'm using IK 24 on my car