I know...I Know...search function blah blah blah. I have worn out search function on this one.

I have a 6 lb lower and use Denso IT22's. I really don't care which brand is best, so that isn't my question...LOL.

My question involves the gap. I have seen a post by Sal talking about the higher boost being an issue with spark blow out. Makes sense to me.

So...what are the pluses and minuses to plug gap amount? What are the theories on making the gap smaller? I have read that it helps to prevent spark blow out. But how does it affect heat dissapation? Does it increase the chance of detonation?


Thanks for any advise given,

Rocks

 

I.ve heard of some of them getting into the mid 40's with the gap...hope this helps

 

You want the widest gap you can run with your mods(pulley size, etc.). The wider gap will give more power. You have to find the 'trade-off' point in the gap where you don't get blow-out but as get it as wide as you can.

. Gapping

Since the gap size has a direct affect on the spark plug's tip temperature and on the voltage necessary to ionize (light) the air/fuel mixture, careful attention is required. While it is a popular misconception that plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings (to ensure ignitability in these denser air/fuel mixtures). As a rule, the more power you are making, the smaller the gap you will need.

A spark plug's voltage requirement is directly proportionate to the gap size. The larger the gap, the more voltage is needed to bridge the gap. Most experienced tuners know that opening gaps up to present a larger spark to the air/fuel mixture maximizes burn efficiency. It is for this reason that most racers add high power ignition systems. The added power allows them to open the gap yet still provide a strong spark.

With this mind, many think the larger the gap the better. In fact, some aftermarket ignition systems boast that their systems can tolerate gaps that are extreme. Be wary of such claims. In most cases, the largest gap (copied from NGK)

Here is some info:

http://www.ngksparkplugs.com/techinf...overviewp5.asp

http://216.239.51.100/search?q=cache...n&ie=UTF-8</a>

http://216.239.51.100/search?q=cache...n&ie=UTF-8</a>

Dan

 

Thanks LIGHTNINROD.

 

Ol' Dan must be feeling better. Hes back to be the information booth operator. Good job Dan.

 

.038 - .040 is perfect

I run Denso IT-22's with 8 differant race set ups
including 4 nitrous and 4 gas only. They perform PERFECT
in all situations

 

I am currently running NGK BR7EF's with a gap of .028...