maxpower

can someone explain this term and how to gap plugs and such. im in the dark on ***

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Harris

There is a gapping tool to set the proper gap on plugs, which you can purchase for cheap from an auto parts store. The tool has measurements on it so you can adjust the plug to the desired gap. You'll know that you have the correct gapping when the tool goes in and out of the gap with a little bit of friction. The procedure is not tough at all. However, you should be careful while bending the electrode. It's quite soft and can break easily if you put exert too much force on it.

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maxpower

so if you widen the gap. there is more spark area but less spark power?

how can you tell what gap best suits a set-up?

Harris

Widening the gap delays the spark, and closing the gap quickens the spark, because of the distance between the tip and the electrode. Use the FSM-recommended gap for best results.

maxpower

great! now. on most turbocharged cars. gaps are closed more right. or not right.

side question. does improper gapping cause detination, are contribute to it?

Harris

I know they use "colder" plugs than N/A guys due to the immense heat produced by turbocharged motors. Gapping should only be changed if you modify your ignition system. AFAIK, the DEs and DETs have the same gapping as recommended by Nissan.


Yes, improper gapping can contribute towards detonation. That millisecond difference in the distance travelled to make the spark is HUGE. Incorrect gapping can cause other problems that will prevent the motor from running properly.

You have to remember that ignition timing is set based on the assumption that the plug has been gapped properly. That's why it's imperative that the plugs are gapped according to manufacturer recommendations. It doesn't matter if you're N/A or turbo. It's one step that no one should look over.

maxpower

oh my. thanks for that info. ill be sure to pm you when tuning my det!

nizzan4u2nv

I find that wire type gappers are the best.

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