Exhaust gas temperature gauge

Yep.

You can see the CHT and EGT on each of the six cylinders.

Yeah.

No surprise.

... boom.

And, um, as soon as I did that, I started dragging my eyes across the panel, and just all hell broke loose.

I mean, you just, the vibration and, and, um, it went to 1,700 on the number six cylinder EGT.

Uh, at that point it's normal around 13, 1320.

You know, by nature of a tiny turbine housing and a high revving engine, I think we had about five bar of back pressure in there.

And we're EGTs up about 680C.

So, you know, our exhaust system cracks with 0.6 millimeter wall thickness at all those parameters.

Hard to believe.

Mm-hmm

... creates tons of EGT.

And yeah, so the DV's job is to pull...

When the in- when the pump is done injecting, the DV's job is to pull the extra fuel out of the line to drop your injection pressure down low enough that your injector immediately stops injecting.

fuel dumping

out? Raw fuel is going to make you cold.

Your coal is what makes EGTs.

EGTs is your exhaust gas temperatures.

Gotcha.

Those will start hurting things inside the motor.

So that the more nitrous you can shove into her, the colder you make it, the

better it's going to run.

On a turbine engine, what is the engine pressure ratio and what does it indicate? It's the ratio between the total inlet pressure and the total turbine exhaust pressure, and it's used to indicate the thrust developed by the engine.

On a turbine engine, what does the exhaust gas temperature indicate and how is it obtained? EGT, the exhaust gas temperature, is the average temperature of the turbine discharge gases and is measured by thermocouples placed near the turbine exit.

Can the EGT system on a turbine engine be checked without running the engine? Yes, by checking the resistance of the thermocouples and circuits.

Define the term thermal efficiency in regards to aircraft engines.

Thermal efficiency is the ratio of net work produced by the engine to the chemical energy supplied by the fuel.

What are turbofan blades made of? Hollow titanium and composites.

What is meant by trimming a turbine engine? Adjusting the fuel controls so the engine develops the correct idle and trim speed RPM.

What type of equipment should be used to determine that a turbine engine is performing up to the standards specified by the engine manufacturer? A JetCal analyzer slash trimmer has the instrumentation and cables needed to check the EGT, EPIR, and other parameters specified by the engine manufacturer.

So reduced friction pretty much keeps an engine cooler.

So with the steel pistons, the better connecting rods, everything that we do to these engine builds, it reduces friction, which reduces engine temperatures and EGTs, and that's something that everyone wants, is a cooler, smoother running engine.

Uh, because also when you reduce friction, fuel economy goes up.

So it's not a huge gain.

Yeah.

So the question is, so I see this cause I look at all the FIBA reports and I see, especially the FIBA one reports, which are looking for the oscillating EGT reports.

And I'll see a obvious oscillating EGT on an alert from FIBA.

And then it goes away after a couple of flights.

I see that often, very often.

It, I climb out and learn three 73 75, but I'm fairly aggressive in the way that I lean in the climb.

Uh, but when I get in cruise, cause I'm cruising.

I almost never cruise below 6,000 feet and at 8,000 feet, I'm wide open throttle and I'm probably at peak EGT.

Even before nitrous, we were melting stuff.

When you start turning up diesels a lot, you've heard the term EGT, YGT.

We kind of don't watch that in racing.

It's really not much of a concern because of the time frame it's under that high temperature.

But I do like how intense we can be in the eighth mile racing.

Which is funny.

I would say that what's funny, we talked about EGTs.

I would say if I were 20 years ago, whenever... 15 years ago whenever it was when i was like on forums and stuff and i was reading about high performance whatever else i thought egt's were this like that was what you how you killed an engine like that's any major engine build a good engine build whatever big performance like egt's would be how you you've made that engine fail it's actually really hilarious how little of a concern it actually is yeah like i would say in the last 10 years have you had an egt engine failure

Like I said, it all depends on what stage of engine development it's in.

And another thing that they'll look at is EGT exhaust gas temperatures.

And historically, most of the time, and there'll be exhaust gas temperature sensors in the exhaust system.

Most of the time, they'll start by reading it about an inch or so out of the exhaust port, but there'll be before the turbo, after the turbo, if it's turbocharged, all over the place.