making a colortune

[petrolhead]

Since i am trying to cut down on special tool costs (i just want to many)
I found a DIY tutorial for the colortune on flyingbanana.
It is good but the chipping away the porcelain is blunting my chissels in no time.
And itīs difficult, easy to damage the metal etc.
I found an easier way and decided to share it here.
Just cut away a small ring from the metal holder just under the porcelain with a angle grinder or dremel.
You can lift the porcelain straight out.
c t small.jpg

[phydeauxmutt]

After you remove the porcelain, what do you install as a heat-resistant, electrically-insulated viewing window?

[Rich82GS750TZ]

??? any link to the flyingbanana tutorial?

[petrolhead]

Epoxy would be the easiest.
Below is the link;

https://www.theflyingbanana.com/tfbtechtips.htm

[petrolhead]

ct klein.jpg
a nail for a pin welded to a 4mm. thread and taped to the top.
At the bottom end i have a small piece of tape (folded inside out) to stick the nail to the electrode to keep it centered.
After that i keep the plug upside down, stick it to a stand with tape and fill it with a seringe with epoxy.

[petrolhead]

ct light.jpg
With a flashlight it is clear but i will test it tomorrow cause it seems not cured yet.

[chuck hahn]

I did that tutorial long ago and it was no where as see through as the real deal. just my 2 cents

[petrolhead]

Well; the original one costs 117 dollar.
The nail costs me 7 cent and an old spark plug.
Itīs worth a risk to me.

[Grimly]

Well; the original one costs 117 dollar.
The nail costs me 7 cent and an old spark plug.
Itīs worth a risk to me.

Just don't stand with your eye directly in line with it.

[petrolhead]

Good advice !
I am wearing glasses so that is a bit of protection.
Chuck is right; it is hard to see specially in the sunlight.
But under a blanket with a fan for the heat it works.
And because i wonīt use it often it saves me some cash for every day tools.

[Forden]

any chance you might post a video? Curious how well it worked out.
cheers

[petrolhead]

https://www.youtube.com/watch?v=4T1FzNnIXe0

it is evening here, so better visible.
I canīt seem to get the blue color.
Maybe i need a smaller set of pilots.

[Cipher]

It works well enough.
kudos.

Are these cv carbs? I've read colourtune is not as useful on them.
Also maybe the nails impedance is impacting the spark colour?
Is it up to Lucas electrics standard?


Nice video space manipulation. Makes me wish they'd shot Lawrence of Arabia vertically.

[petrolhead]

The carbs are VM slide carbs.
The nail is a common iron nail, i have not thought about impedance.

[Cipher]

The carbs are VM slide carbs.
The nail is a common iron nail, i have not thought about impedance.

https://www.bluesea.com/resources/108/Electrical_Conductivity_of_Materials

Ngk standard plugs are copper core. I imagine its a tiny strand but they would not spend the money without reason.