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EGT
- Thread starter rbjscott
- Start date
airboat383
Member
The only thing i have tried is by using a laser temp. gauge. But i did get a reading of 980 at the head after a wide open run for about two minutes. I don't know anyone who has a egt gauge on their boat but i'm sure WaterThunder can give you a better answer.
marshmaster pat
Well-known member
Never have seen EGT measured on an airboat. I have however seen a few with CHT (Cylinder Head Temperatures) gauges on them.
I would be cautious about monitoring the EGT without watching the CHT, if you were going to try to use it for leaning a boat out and getting the best fuel mileage.
I know that we get both the 0-540 angle and parallel valve engine headers glowing orange when running hard during summer nights. The ZZ3 I used to run on a Panther would get orange at night as well.
I would be cautious about monitoring the EGT without watching the CHT, if you were going to try to use it for leaning a boat out and getting the best fuel mileage.
I know that we get both the 0-540 angle and parallel valve engine headers glowing orange when running hard during summer nights. The ZZ3 I used to run on a Panther would get orange at night as well.
marshmaster pat
Well-known member
ricmey - That is well below maximum. Like most airboats, sounds like it was set up to run rich, probably at full rick. CHT should have be fine.
A
Anonymous
Guest
Exhaust gas temperature is used in the following way on aircraft.
Takeoff at full rich, using the mixture control.
lean back slightly at cruise.
At rated RPM, lean mixture until exhaust temp peaks and starts to fall back down.
Very dangerous here.
When you find the peak and see the temp start back down with more leaning, turn the mix control richer until the temp goes back up to the peak and keep advancing to the rich side until you can be sure you are on the lower side of the peak. Temperature will be about 1200 to 1300 degreees depending on engine type.
Running the temp on the lean side of the peak, (over the top) will burn pistons, rings, valves, bearings, and your A** quick.
A friend of mine tried to lean his 180 in a Cessna and it cost him a new set of cylinders, and could have cost him his life.
My advice, set the engine timing where it is supposed to be, run the right fuel. If the engine starts running on, knocking at high speed, or burns the paint off the heads, it it running lean.
By the way I am running a bone stock Holley 500 two barrel on my stock 470 GPU it does fine.
Takeoff at full rich, using the mixture control.
lean back slightly at cruise.
At rated RPM, lean mixture until exhaust temp peaks and starts to fall back down.
Very dangerous here.
When you find the peak and see the temp start back down with more leaning, turn the mix control richer until the temp goes back up to the peak and keep advancing to the rich side until you can be sure you are on the lower side of the peak. Temperature will be about 1200 to 1300 degreees depending on engine type.
Running the temp on the lean side of the peak, (over the top) will burn pistons, rings, valves, bearings, and your A** quick.
A friend of mine tried to lean his 180 in a Cessna and it cost him a new set of cylinders, and could have cost him his life.
My advice, set the engine timing where it is supposed to be, run the right fuel. If the engine starts running on, knocking at high speed, or burns the paint off the heads, it it running lean.
By the way I am running a bone stock Holley 500 two barrel on my stock 470 GPU it does fine.