Adjust your spark plug gap to improve performance

[Mini-itx]

Its not a joke, I did some experiment from 0.028 to 0.055" with a Mallory coil.

 

Performance at 0.055" gives me the best performance and definitely best FC since I step less to get the same power. Engine is smoother, acceleration better.

 

If you are sticking with stock coils, you can also experiment by increasing your gap a little and see if you gain anything. If you increase too much, you will get misfiring. If you do, then reduce the gap a little and that will be your ideal gap.

 

Unfortunately, I didn't stick with 0.055" for long before under full boost, it will misfire (expected from Turbo cars). Recommend gap for Turbo cars is around 0.028-0.03 only.

[Verve]

yours turbo car, for most of us small cc NA-sters, i don t think any diff man

[Smhomie]

Depending on your settings within the map or stand-alone, you can adjust the dwell time. Mallory, Jacobs or MSD advises to adjust dwell time if not you risk burning out your coils.

 

You tend to have a closer gap because of rich fueling or hard to ignite fuels.

[5936]

Now you are into this new project or experiment.

Yes, I agree with you that changes to sp gap will affect engine performance. Both positive and negatively.

To find the TOP DEAD CENTRE of optimum gap for best firing/power.

 

I have also gone through these experiments. Very expensive projects.

These are the mistakes and lessons learned

- Plug cross thread. Drive a 3 cylinder fired car to look for Wksp at Sunday morning.

- Shorted my Mallory coil. Tow car to Wksp

- broke a few plugs.

-ended up with few sets of plugs

don't say I never tell you.

[Mini-itx]

Wah bro you so fierce..... I must say I have gone thru a few sets of plugs for my car too but short circuit your coil and cross thread..... hmmm.... never happen to me.

 

What happened more to me is kana burnt by the hot engine while removing and installing plugs.

 

I have also rewire my coil etc and now settle at a 0.03" gap due to increased in boost.

[Mini-itx]

Btw, do take note of one thing.

 

Spark plug gap is directly affected by engine compression and WOT RPM. This is because as there are more air in the combustion chamber, a higher voltage will be required to jump the gap and create the spark.

 

Thus if you are running fine at 2-3K RPM but you get misfiring at WOT @ 5-6K RPM, this mean you need to reduce your gap. High compression engines naturally need a smaller gap too.

 

Turbo engines also require smaller gap because of higher pressure compared to NA.

Edited August 9, 2010 by Mini-itx

[6821]

Btw, do take note of one thing.

 

Spark plug gap is directly affected by engine compression and WOT RPM. This is because as there are more air in the combustion chamber, a higher voltage will be required to jump the gap and create the spark.

 

Thus if you are running fine at 2-3K RPM but you get misfiring at WOT @ 5-6K RPM, this mean you need to reduce your gap. High compression engines naturally need a smaller gap too.

 

Turbo engines also require smaller gap because of higher pressure compared to NA.

[5936]

Not I fierce.

But rather very clumsy.