EGT thermocouple probe installation

[SSS]

What cylinder is the best place to install an EGT thermocouple probe to read the hottest exhaust temps coming from the engine? I'm thinking either cylinder 2 or 3, as close to the exhaust port in the primaries as possible.

[deviousKA]

Do you think there would be much difference between any of the 4?, seeing as its a single throttle body system (similar air flow to all cylinders). I know with any kind of individual system temps could vary. This involves installing some sort of a bung in the header correct?, im assuming you are running an aftermarket header. Installing one nicely in a cast manifold would seem a bit tricky with out making a weak crack prone area.

but then again, i could very well be wrong.

[SSS]

This is an old pic of my engine bay, yes the bung is welded into one of the primaries and the compression fitting and the probe screwed into place. I know installing it in the cylinder that runs the leanest would be the best option, but i have yet to work out which one does (ie the injector closest to the FPR or closest to the fuel rail inlet?)

[deviousKA]

hmmm, what are you using to interpret the signal? (i have little knowledge of egt thermocouples). Why not just run 4, to a simple multidisplay device. That would give a nice tuning feature in getting all your cylinders matched.

btw, nice header

[SSS]

thanks bud.Device i'm using/building can be found on here: http://www.autospeed.com/cms/article.html?&A=0376

Displays upto 1100 deg C and is accurate to 1 degree C. I'd like to run 4 probes, but not at $58 AUD each! One should be fine. Has cost me under $210 AUD, much cheaper and more accurate than a brand name gauge for double the price. Plus, much easier to glance at quickly instead of looking at a needle. Less likely to be stolen too.