On Wed, 4 Jan 2006 05:30:51 -0500 (Eastern Standard Time) "Dan Heath" <da...@alltel.net> writes: > Stanley, > > If you are truly running 1800 EGT, I think that you are burning your > engine > up. The reason for asking about the meter and mixture control was > to > determine if you have a way to adjust the mixture from the cockpit > and if > you have another way of verifying those extraordinary temperatures. > I think > that if your mixture is lean to the point that you get a true 1800, > that > your engine would not run. And if the air-fuel ratio meter is > telling you > that your mixture is correct, then the EGT gauge is faulty. You said > that > you have the standard intake system, so unless you have done > something > upstream of the air-fuel sender, your mixture is correct.
Stanley, I suspect your high readings are either EGT probe placement or a gauge/meter mismatch. EGTs simply do not keep getting hotter as you lean out. What happens is that you reach a peak temperature as you lean, then the EGT temp starts dropping off. That's where the idea of running "Lean Of Peak" comes in. In that case you lean until you reach peak EGT. The actual EGT number is irrelevant. Then you continue to lean until your leanest cylinder is 50 degrees cooler than the peak EGT. I'm not necessarily advocating LOP operations, but am citing this as an example of hitting peak EGT, then continuing to lean. Most properly installed EGTs on a normally aspirated engine will show the peak EGT somewhere between 1300 and 1600 degrees depending on altitude. It seems that you listed your probe installation as 8" from the exhaust port in a previous post. I would suggest remounting them 4" from the exhaust port. You will also want to check for appropriate connections, correct wiring, etc. Jeff Scott
