The turbo unit on the Cummins 5. However, the fixed unit is much more reliable and has fewer moving parts, which is exactly what the best Cummins engine should be focused on. This, combined with a lower pressure injector means that you will be less likely to blow a head gasket with heavy use. If you are looking for an engine that will be as reliable and durable as it can possibly be, this could be a fantastic option.
Sources: USEngineProduction. Figure 6: The 5. The Cummins 5. It utilizes a compacted graphite iron block for a durable construction that is still light enough for smaller applications. If you want an engine that will be less susceptible to noise and vibrations, it could be a great option. The turbocharger in the 5. It uses high injection pressure to give the most precise control of the in-cylinder combustion. This leads to superior fuel efficiency and almost zero emissions.
Just because the 5. It still delivers stock horsepower and lb-ft of torque due to the fuel system and the Two-Stage turbo. If you are looking for a good balance between performance and comfort, this could be the best Cummins engine for your truck.
Load More. Share this. Share 0. Tweet 0. Loved this? It used a variable geometry turbo and had a bore of 4. However, as far as emissions control devices are concerned, the 6. The brand new, 6. On model year Rams, selective catalytic reduction SCR would be added to the mix, which as part of the exhaust after treatment system would require the use of diesel exhaust fluid DEF to reduce NOx emissions.
And now the trade-offs begin! Due to the aforementioned emissions control components, fuel economy is noticeably lower on 6. However, the 6. While plenty of folks still believe the venerable 5. But, is the 6. At the heart of the system sits a Bosch CP3 injection pump, which is responsible for creating in excess of 23, psi of fuel pressure and then maintaining that pressure.
However, the common-rail system aboard the 6. You may wonder why the Cummins engine is such a highly sought after truck engine.
More important, the Cummins engine has a reputation for being tough, long-lasting, and virtually impossible to kill. This may be attributed to the fact that the engine was originally designed as a commercial-duty engine. The fact that it is used in consumer trucks means it would take a lot of continuous, hard and long abuse to stop these engines. It was in when a Cummins Turbodiesel made its way into a Ram pickup — and the legend began.
The powerful engine blew competition from Ford and GMC out of the water. Cummins began to dominate the market when it came to diesel engines for the automotive industry because of its reputation for longevity. The crankshaft and the connecting rods are forged steel along with massive main bearings. Talk to any old school truck drivers in the s and they will tell you tales when the Cummins series were the king of the road. Hard not to leave these engines off the best diesel engine of all time list.
There were some drawbacks with the specifically when trying to start the engine in colder climates. That being said a glow plug or a shot of ether should do the trick to fix this simple issue because overall this is a great engine.
It was supposed to be the Caddalic and the best diesel engine every designed at Cummins. The ISX was engineered with a dual overhead cam design; one cam accessed the valve train and the other took care of the actuating injectors. What this does is lower the combustion chamber temperatures limiting the formation of NOx. A neat concept but there were many issues with this system that caused many engine failures.
The main point of failure is the dual overhead cam design which overly complicated things and caused many snowball effect types of issues in the engine. In Cummins re-designed the ISX with a single overhead design to simplify things but the damage was done. This was supposed to be Cummins entrance into the electronic world however it was much too complicated for its own good.
It is rightfully so belongs off the best diesel engine list; disappointing indeed. Fun fact of the day: the Detroit Diesel Series 60 was mostly developed by John Deere although how much of an influence Deere had is debatable. GM knew the company was in trouble and sought out help from John Deere engineers to re-establish their reputation. However the joint venture never came to fruition but the engine control technology took off. The first diesel ECM was wildly popular with consumers due to its ease of use and updates in real time to the driver.
Functions in the DDEC system included engine diagnostic functions, shutdown timers, progressive shift functions, fault history and record keeping, speed limiting governors, cruise control and automatic stall preventing. The cruise control technology was particularly popular with fleet managers due to its fuel-saving function but most notably DDEC system allowed the operator to download engine management reports regarding use of the engine, provide record of over-speeding, excessive idle time, hard breaking and other parameters.
The DDEC allowed dealers to change the horsepower settings and in some cases propriety software was able to be loaded into the computer.
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