Max EGT? Options

[technicalninja]

The title is the question.

I know what to look for with water-cooled stuff.

I have no experience with air-cooled stuff yet...

What say you?

Is there a normal range?

A never exceed number?

Anyone ever use 4 thermocouples?

Was there any noticeable difference (#3 is of concern to me)?


Thoughts, tips, any data would be greatly appreciated!

[gereed75]

Slightly OT but telling: My son was runnning an Audi SQ5 on the street (until it got stolen). V6 turbo, chipped. He had a phone app that could read every engine parameter that the computer saw and used for tuning.

One cylinder on that engine was slightly more prone to detonation than the others, #5 or 6. Maybe because it was adjacent to the turbo and slightly hotter, also at end of fuel rail, maybe tended leaner, whatever, but as it detonated the computer reduced advance in that cylinder only, not a lot. About halve a degree. That was enough.

Two points - they don’t use AFR. or EGT. They use individual knock sensors on each cylinder. And secondly they did not control it using fuel flow, they use timing.

That tells you a lot about balancing cylinders and what parameters are important and effective

So assuming your cooling system is up to par, and that is very important. And your mixtures are good (AFR correct) and no mechanical problems - then timing is super important to controlling CHT .

One or two degrees really matter. Too high and the ICP goes up, stress goes up, CHT goes up and you make LESS POWER.