Using a staged fuel distribution ratio helps improve engine combustion which ultimately reduces emissions ouput. The HEUI injector allows for multiple injections at different metered rates. The engine configuration was the same as the 3126 but the fuel system changed using a new engineered style known as the HEUI injector. The CAT C7 shares many common configurations with the CAT 3126. Older CAT engines like the 3116 or 3126 were essentially grandfathered into the older tier rating requirements and did not need to be upgraded. The Caterpillar C7 was released in 2003, only months ahead of the Tier 4 ratings change, and replaced the popular 3126 model. The stricter Tier 4 emissions requirements went into effect January 1, 2004. Caterpillar, needed to produce a new engine that was going to meet or exceed the Tier Ratings enacted by the EPA in 1994 to curb diesel engine emissions. The Caterpillar C7 was designed mostly out of necessity vs. mostly box tucks, tow trucks, daycabs, and straight trucks. The technical classification of a medium duty tuck is a single drive axel with a gross vehicle weight of 18,000-33,000 lbs. Paccar, Freightliner, Ford and GMC all purchased the engine in droves. All of the big players in the trucking industry hopped on board hoping the CAT C7 was going to live up to the hype. The engine was produced from 2003 to 2009 and was installed primarily in over the road medium duty class 8 trucks. However, sometimes things don’t go according to plan. The Caterpillar C7 Engine was supposed to be the “golden child” in Caterpillar diesel engine lineup one that combined raw horsepower with computer controlled clean emissions. The more the input readings, the better the output decisions are.At the turn of the century there was a lot of buzz around a new diesel engine being produced at Caterpillar, one that could meet the growing emissions requirements enacted by the EPA. One ECT sensor might not be as much reliable to operate the fan efficiently. This secondary ECT Sensor works together with the primary ECT Sensor to optimize the working of the car and give an accurate reading of the coolant to the car ECU before it is heated up, saving it from potential overheating problems.Īdding an ECT sensor is another way to get a more accurate reading. To keep the radiator of the engine working properly and to regulate the temperature of the engine constantly, locating these leakages is also very important. However, the one location where the secondary ECT Sensor is seldom placed in the radiator is the outlet of the radiator tank or pipe as it is the most common place for leakage of the engine coolant fluid. The location of this sensor is not very common and is found in different locations in different cars. The other Engine Coolant Temperature Sensor is known as the secondary ECT sensor or the ECT sensor 2. This cylinder head closes the top opening of the cylinders and packs it into a casing forming a combustion chamber for the fuel and air to mix and react. In an internal combustion car’s engine, the cylinder head is placed on the top of the car’s cylinders above the cylinder block. This sensor is located on the coolant passage next to or in the thermostat housing of the cylinder block or cylinder head. The main Engine Coolant Temperature Sensor is known as the primary ECT sensor or ECT sensor 1. One sensor is located near the thermostat valve housing, and the second one is located in the radiator outlet tank or pipe. The pair sensors can be installed in different places, depending on the make, model, and year. Most of the cars that are being used nowadays contain pairs of Engine Coolant Temperature (ECT) Sensors for the purpose of sending accurate and precise information to the car ECU. ![]() These sensors are directly connected to the car ECU for measuring the temperature of the engine coolant. This sensor consists of wires ranging from 1 to 4. But modern cars, have coolant temperature sensors placed next to the thermostat housing, which is directly connected to the car ECU.
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