Exhaust temp sensors

[Webb]

FreshMar at aol.com wrote:
> 
>  Has anyone tried thermosensors on individual exhaust pipes, to monitor
> the exhaust temps for more analytical data? They could return the optimum
> exhaust temp (600F?),any higher could be interpreted as 'too lean'. This
> could be another cheap engine tuning tool? Or wont it? It will not be
> immediate or instantanious, but could show differences in each cylender,
> providing the thermosensors are of high quality and equally accurate.
> Mario T.

2 cycle aircraft (ultralight) engines use this trick to get a mixture
window between too hot (sieze up + you die) and too rich (plugs foul and
you die)

The trick seems to work well enough. The jets are usually changed on the
ground, but adjustable mixture mods are available for the carbs. Check
out "Leading Edge Airfoils" or "Aircraft Spruce and Specialty" catalogs
for parts...