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Spark Plug Gaping?

Started by Spark, March 05, 2003, 01:37:15 PM

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Spark

what is Spark Plug gaping? ano maiitulong nito meron bang improve performance sa auto?? & lastly how to do it? ty!!!

talontsi

ck mo specs.  under d hood f u still using d same stock engine (no engine swap yet) and use proper plug gapping tool, yes they do affect engine performance. note some engine dnt work properly w/ after market plugs!

the driver


 See to it that you use the right measuring tool... also convertion is important....metric to english system.

 If you want to use spark plug longer.... it is advisable to gap to stock spec after several thousands kms.
" Each day we either get better or worse.
                 The choice is OURS ! "

jewo

would anyone happen to knw d proper gap for a 4g63 SOHC engine??? wala ung manual ng kotse kya d ko alam e....ty

clyde

Quote from: Spark on March 05, 2003, 01:37:15 PM
what is Spark Plug gaping? ano maiitulong nito meron bang improve performance sa auto?? & lastly how to do it? ty!!!


From NGK:

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 you can run may still be smaller than you think.

more sparkplug tips:

http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp

HTH :D

sixpack

Most vechicles here uses .30in spark plug gap.

primeforce

0.30in? parang ang laki ata ng gap n un a? d b 0.3o inch is almost 1/4inch? ang laki ata nun... typo error lang cguro... pro most cars has a 0.82-1.18mm or 0.032-0.046 inch gap....
PEACE...

drexx

Mar. 7, 2003 ( UTC - 8)

Quote from: Spark on March 05, 2003, 01:37:15 PM
what is Spark Plug gaping? ano maiitulong nito meron bang improve performance sa auto?? & lastly how to do it? ty!!!

One adjusts the spark plug gap to increase or decrease spark. Tuners sometimes increase the spark plug gap to get a bigger spark, in the hopes of a more complete air/fuel burn. However, if you have forced compression, plugs are made to have smaller gaps to insure that there will be a spark. This technique is used with indexing, where the spark is faced towards the intake valves, or even the exhaust ports. If spark plugs are not gapped properly, it may cause engine hesitation or "stuttering" while cruising at higher rpm's.
For street vehicles or daily drivers, do not expect big (i.e. noticeable) performance gains with *just* spark plug mods.
Drexx Laggui  -  TLCA; PMC
San Jose, CA, USA
My off-road action! UZJ-100W; FZJ-80L; HDJ-80L; LN-166
[IMG]htt

sixpack

Quote from: primeforce on March 06, 2003, 08:33:07 AM
0.30in? parang ang laki ata ng gap n un a? d b 0.3o inch is almost 1/4inch? ang laki ata nun... typo error lang cguro... pro most cars has a 0.82-1.18mm or 0.032-0.046 inch gap....
PEACE...

Sorry about that, what i mean it 0.030inch gap.  This is true for most cars.  For GM with HEI, I would use 0.055inch gap.  

johnqpublic318

0.030 is typical for older point-style system.  Newer cars with fuel-injection and electronic ignition should run larger gap.   For most power and max efficiency run the largest gap that your ignition system can handle.  Typically, this will be 0.040-0.055 for newer cars with fairly powerful ignitions systems.

Use a Bosch Super4 and you don't have to gap at all.

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