![]() ![]() In a HEUI system, the oil pump inside the engine supplies oil to a high-pressure oil pump or HPOP. This same technology is also found in the Ford Power Stroke and was used by International in several different applications with their inline six-cylinder engines in the DT series trucks, but HEUI is a trademark of Caterpillar.Ĭaterpillar used high-pressure oil to make even higher injection pressures, effectively squeezing fuel out of the injector nozzle. The components include an ECU (Electronic Control Unit), electronic injectors, and various sensors placed on the engine and vehicle. All HEUI designs work in the same fashion. To achieve its electronic advancement the 3126 engine utilized HEUI (Hydraulic Electronic Unit Injector). The 300 horsepower version produced peak power at 2,200 rpm with the torque peaking at 800 ft.lbs. It was a part of the “gear fast, run slow” strategy from Cat, which allows the engine to run slower at cruise speeds, translating into potential reduced fuel consumption. It was also offered in off-road applications as well in excavators, skidders, motor graders, industrial, and marine.ĭepending on application, the 3126 ranged from 175 to 300 hp. The 3126 could be found in GMC, Ford and Freightliner trucks, Thomas and other school buses, recreational vehicles and smaller emergency vehicles. To counter its poor reputation and meet tightening emissions demands, Cat released the 3126 in 1997 as its first midrange electronic diesel engine. Not too many 3116 owners were proud of Cat’s reputation behind the engine and, while the engine did prove reliable, it didn’t offer enough power for most users and was not very fuel-efficient. The 3116 caused strong reactions in many people, to say the least. The 3116 engine was used up until the mid ’90s until society demanded more. The 3126 was, in fact, the replacement for the Cat 3116 and that’s where this story REALLY starts. The C7 was Caterpillar’s answer to growing demands for emissions reductions and was derived from its older engine brother, the Cat 3126. Of course, to understand where we are, it’s often necessary to take a look back. ![]() To meet regulations, advanced emission solutions include a closed crankcase breather and a diesel particulate filter using Cat’s proprietary regeneration system. The Cat C7 is an inline 6-cylinder diesel engine with a displacement of 7.2 liters or 441 cubic inches.Īt the end of its production cycle, the engine included a number of features including turbocharging, common rail fuel injection system, full electronic control system and Caterpillar’s ACERT fuel/air management system. Another popular Cat engine, they’re now seeing rebuilding opportunities, so we thought we would take a look at how things have changed to get to where we are today.įrom 2003 to 2009, the C7 was Caterpillar’s primary engine for medium-duty trucks with a GVWR of 18,000 to 33,000 lbs. The Caterpillar C7 engine is no exception. In addition, the EPA has raised standards and lowered emissions in response to or as a cause of technological advances. Heavy-duty diesels that transport goods across the country along with the ones that are used to excavate highways are all using the same competitive strategies to stay on top. The same can be said about the heavy-duty industry as well. The 330 through 360 horsepower ratings were only available in RV and firetruck The choice of torque options allowed different transmissions, which are rated by torque capacity, to be matched with the C7. ratings were available in either a low torque or high torque option. Torque ratings ranged from 520 up to 925 lb-ft. The Cat C7 was available with the following horsepower ratings:Ģ10, 230, 250, 275, 300, 330, 350 and 360 hp. Today’s society has directed them to make more power, use less fuel and offer more features. Look at the automotive manufacturers themselves. A quality independent automotive repair facility that keeps up with technological advances is no different than any other competitive industry. ![]()
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