Banks Power Why EGT is Important.By C. How To Install Clamp On Oar Locks on this page. J. Baker. Diesel engines are not indestructible.Aside from running a diesel without oil, or filling the fuel tank with gasoline instead of diesel fuel, few things will damage or kill a diesel engine faster than excessive exhaust gas temperature EGT, yet strangely enough, no diesel pickups or motorhomes come equipped with a pyrometer as standard equipment to monitor EGT.During normal operation of such vehicles, EGTs usually stay within safe limits, but situations can occur where the EGT gets too high, doing serious engine damage without any warning to the driver.A pyrometer that displays a diesels EGT can warn the driver of dangerous conditions before such damage occurs.Thats probably why the Banks Dyna.Fact pyrometer is one of the most popular items we sell, and why a Dyna.Fact pyrometer is included as part of many of our power systems.A pyrometer is a temperature gauge designed to measure high temperatures above those measurable with an ordinary thermometer.It consists of a temperature sensing probe thermocouple that is placed in the area, or flow, to be measured.The probe is connected to a gauge, which is located a safe distance away from the high temperature source.On a diesel, this means the pyrometer sensing probe is mounted in the exhaust manifold or immediately after the turbine outlet of the turbocharger, and the gauge is mounted in the drivers compartment.The purpose is to measure and display EGT in degrees Fahrenheit F.Where the probe is positioned before the turbine section of the turbocharger, the EGT may also be called the turbine inlet temperature.As you would expect, EGT measured after the turbo is called turbine outlet temperature.We might mention that some mechanics fear installing the pyrometer thermocouple in the exhaust manifold for fear the probe will break or burn off and blow into the turbocharger.Such a piece of foreign material entering the turbine would cause serious damage that could in turn break the compressor wheel of the turbo, sending broken pieces into the intake system of the engine where even more damage could occur.While the above scenario is scary, it is also unlikely.Todays quality pyrometers feature thermocouples that are sheathed in stainless steel to prevent just such an occurrence.It is exceedingly rare to find a diesel mechanic that can honestly say hes ever seen a thermocouple that has failed and fallen into the turbo on a diesel pickup or motorhome.It just doesnt happen with a good pyrometer.Whether the pyrometer thermocouple is mounted before or after the turbine is usually a matter of finding a suitable mounting location, or of convenience.It should be noted that when the EGT is measured after the turbine, the turbine outlet temperature at full throttle or under a heavy load typically would be 2.F.EGT measured in the exhaust manifold.The temperature drop after the turbo indicates the amount of heat energy in the total exhaust gas flow that was used to drive the turbocharger.The temperature drop through the turbine is also related to the total flow and speed of the flow through the turbo.At part throttle, under light load, such as cruise conditions, the turbine outlet EGT may be as much as 5.F.At high turbine speeds under heavy load the exhaust gases simply dont have time to give up as much heat energy as they speed through the turbine.Warning If you have a injected fuel system and planning or running lean of peak.G2, 3 or 4 is a better choice.The G1 GEM offers the basic.Install the banjo bolt fitting onto the end of the 4 stainless line and tighten the fitting before bolting the banjo fitting to the turbo.This variance is why installation of the thermocouple in the exhaust manifold is considered more accurate.The EGTs discussed in the remainder of this article will all be turbine inlet temperatures.At Banks, we recommend the installation of a quality pyrometer on any turbo diesel vehicle.Its an inexpensive upgrade that allows the driver to keep his engine out of EGT trouble, and it can even be a guide to optimum fuel economy, but more on that later.For more information on the Banks pyrometer, see Banks Dyna.Fact Gauges.So why is EGT importantEGT is an indication of how hot the combustion process is in the cylinders, and the amount of afterburning that is occurring in the exhaust manifold.EGT is also directly related to the airfuel ratio.The richer the airfuel ratio in a diesel, the higher the EGT will be.Two things can create a rich mixture under heavy loads or at full throttle the first is too much fuel, and the second is not enough air.That seems simple enough, but its the second part, not enough air, that could get a stock, unmodified truck or motorhome in trouble.Anything that restricts intake airflow, or intake air density, limits the air mass that gets to the cylinders.Think of it as the amount of oxygen getting to the cylinders to support the combustion of fuel.EGT_probe05092003.jpg' alt='Best Location To Install Egt Probe' title='Best Location To Install Egt Probe' />This could include a dirty or restrictive air cleaner, a partially blocked air intake, high outside air temperature, high altitude, restricted airflow to or through the radiator or intercooler, and high water temperature.The vehicles water temperature gauge will provide a warning of a cooling system problem, but the other problems arent likely to be noticed without a pyrometer unless the driver notices excessive exhaust smoke.A pyrometer also reacts more quickly than the water temperature gauge, so it allows the driver to spot a problem sooner and avoid engine damage.A restrictive exhaust system can also reduce the airflow through the engine, resulting in a rich condition.Any of the above conditions can result in excessive EGT if the vehicle is working hard, such as pulling a heavy load, running at sustained high speed, subjected to climbing a long grade, etc.This website chronicles the construction of Mike Hoovers Vans Aircraft RV9A experimental airplane kitplane.Motor Trend reviews the 2012 Ford F450 where consumers can find detailed information on specs, fuel economy, transmission and safety.Find local 2012 Ford F450.Weve already mentioned that excessive EGT can cause engine damage or turbocharger damage, but lets get more specific.Which parts will fail first is a matter of the design and materials used in the various parts of the turbo diesel, but usually it starts with the turbocharger.Under sustained excessive EGT, the square corners at the outer ends of the vanes, where the material is thinnest on the turbine wheel, can become incandescent and then melt, resulting in a rounding off of the square corners.If you or your mechanic finds this indication before anything more serious happens, consider yourself very lucky, because shortly after the tips melt, the turbine wheel goes out of balance and wipes out the turbocharger bearings, which may or may not result in shaft failure and destruction of the turbine and compressor wheels.Excessive EGT can also erode or crack the turbine housing.In extreme cases, high EGT can drive the turbocharger into an overspeed condition that exceeds the designed operating speed due to the additional heat energy.When this happens, either the turbine wheel or the compressor wheel may burst.If the turbo doesnt go first, excessive EGT, if sustained, will damage the pistons.Such damage can include piston deformation, melting, burning, holes, cracking, etc.This damage is cumulative, so if you slightly burn a piston top, the engine may continue to run without problems, but the next time you run excessive EGT more damage may be done, and so on, until failure occurs.Piston failure can be catastrophic that means very expensive.At a minimum, an engine overhaul will be required, and that too is expensive.Excessive EGT can also cause exhaust manifold and cylinder head cracking.Exhaust valves can fail from high EGT as well.Among the first engine parts to suffer damage will be those made of aluminum since aluminum has a lower softening and melting temperature than steel or cast iron.Diesel pistons are aluminum, and a growing number of diesels also use aluminum cylinder heads.We mentioned earlier that excessive EGTs are due to a rich airfuel mixture, which can be caused by too much fuel.Quest Code Tester For Oracle Keygen Download on this page.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |