OK… so this one monitors EGT and CHT. Those stand for Exhaust Gas Temperature and Cylinder Head Temperature. It can also do Fuel Flow. That sounds cool. And of course, Oil Pressure, Oil Temperature, and… TIT?
What on earth is TIT?
I did a quick internet search on TITs, and I’m sure you can guess what happened. Yes. Thousands of pictures of female… well… you know whats.
Adding “airplane” didn’t help, believe it or not. Now I just had thousands of pictures of female you-know whats being flashed in airplanes of every sort imaginable.
Clearly, a TIT monitor isn’t something we need onboard our plane.
But the Horsepower Meter and Amp Meter sound useful. Yep, if you haven’t guessed, I’m trying to choose an engine monitor for Tessie. Her old engine showed signs of heat damage when one of its cylinders failed, but I’m 100% sure my engine instruments never showed me running hot. Of course, my old instruments only monitored one of the four cylinders as a proxy for the entire engine. As the “new” engine (technically a major overhaul that mixes new and old parts) is on target to cost more than the airplane itself did in the first place, I’m determined to protect my investment with some sort of system that will let me keep an eye on all four cylinders. Hence the engine monitor search.
For background, the Federal Aviation Administration requires certain instruments to be onboard. These are called Primary instruments. In addition, many planes provide instruments above and beyond the required minimums, and these extra goodies are called either secondary or non-primary, depending on whom you are talking to. Of course, originally, all the instruments were round dials with needles. Like everything else in the world, colorful digital screens have taken over.
Some of these digital wonders are certified to function as primaries, and a single box can replace a panel full of dials—at least in most airplanes. But I can’t find a single unit approved for the Ercoupe, and that means I need to keep my old watch-one-cylinder dials while the fancy-pants high-tech wonder that can track everything the engine is doing will only have the status of a secondary system.
Anyway, I finally got it down to three choices, which made it remarkably like an expensive version of Goldilocks and the Three Bears. One is too big. One is hard to read. And one, I decide, is juuuuuuust right.
And it’s the one with the mysterious TIT meter.
I emailed my mechanic. It turns out that, as I suspected, the machine doesn’t monitor actual, well, you know whats. It turns out that it measures Turbine Inlet Temperature on turbocharged engines.
And we don’t have TITs like that.