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Here's @Mattax plugs and what Shrinker had to say: Do they look familiar: There is nothing happening in the cylinder. Theres no air being compressed. Its not even making enough bang to seal the rings, its even starting to look like its going to oil up the #3 plug soon. The general grey...

Yep. Bruce Robertson aka Shrinker. He also said this: "Unleaded fuel makes exactly the same colorations as leaded. There is no difference in reading a plug on unleaded. If the plug wont color on unleaded its because you havent got good vaporization of the fuel. Unleaded is much harder to vaporize."

People do, you just never come across them.

This^^^

Does it change the gas species produced during combustion?

The most telling factor is WOT Vacuum.

Its great you read its a shame you don't understand it.

All stuff to try when looking to improve combustion...... How to Pick the Best Carburetor for a Street/Strip Car Have to laugh when the smaller carb ran quickest and idles best its 425 CI on street fuel: As you can see from the Dragstrip Test Results chart, our guess that the 650 carburetor...

Bingo!

No need to, Universities and Scientific Research Labs have spent Billions doing research that you have never read nor understand and come and pretend to do testing.......You'll find it at the library. Let me guess you ran an engine on the dyno with O2's and now you know everything. Welcome to...

You can attack me all day it won't change the science and the reality of what really intelligent people discovered with all their testing.

Insecure much. We are talking about spark plugs and combustion not your ego. Very smart people did a lot of hard work to understand how this stuff works and were kind enough to share those discoveries. I suggest you learn from them.

That's because you can't...... Here's a really good thread on tuning. Tom Vaught was an Engineer at Holley and quoting Shrinker so would know more than the experts here. Start at post #150 SOME HOLLEY CARB TIPS PONTIAC forum Some key take aways: testing was on a tunnel rammed 400 ci race...

Great, How do you calculate AFR?

Why?

Tuning is Chemistry.....

Its called Chemistry.

Then answer it......You make bold claims but when it comes down to the crunch you avoid answering a simple question. Why would you be scared to answer a simple basic question?

Why are you scared to answer a simple question......... Did VP fuels tell you their fuels don't colour plugs too......

Great, since you know so much you shouldn't have any problem answering these questions, can you tell me what Stoichiometry is?

Yes it can be. It also varies between induction strokes and varies between cylinders in some cases as much as 11-1 to 17-1. Its the vaporization rate not the octane. Lower octane fuels are designed to vaporize in low compression engines. If its lean at time of ignition you haven't converted...

First you said your (US) pump gas doesn't colour plugs and it must be an Australian fuel thing: Clearly all those plugs in post #18 that are from US cars are running US pump Fuel magically show colour when you claimed they can't or won't Now you want to claim that race fuels don't colour...

They all colour plugs.......

Different colours indicate different gas species produced. Temperature is pressure.

Here's a 2011 jeep on modern fuel in the US: Here's a set of plugs of the North American Subaru Imprezza forum: North American Subaru Impreza Owners Club Looks like new cars colour plugs too on street fuel in the US....... 70k Spark plug change on 2nd gen. Should my Plugs Look Like This?

There is no difference between street fuel and race fuels when it comes to colouring plugs. It takes more heat to gas the street fuel that's why you get white plugs because its LEAN at time off ignition. The OP should try some Avgas and see how that performs. Or try a smaller carb to increase...

I would first try an NGK plug and a 750 DP and see if it picks up the top end.

Its an indicator of cylinder pressure.

And yet how many times have you heard its like a light switch at 3K......

You think you did more testing than Shrinker?