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The International Harvester Company (IHC) has been building its own proprietary truck engines since the introduction of their first truck in 1907. International tended to use proprietary diesel engines. In the 1970s, IHC built the DVT 573 V-8 diesel of 240 and 260 hp (179 and 194 kW) but these were not highly regarded and relatively few were sold.
The D6H was introduced in 1986 along with 3 other H-Series track-type tractors. This was the first D6 with Caterpillar's elevated drive sprocket undercarriage. The D6R replaced the D6H in 1996, and came in five models ranging from the 165 hp (123 kW) D6R to the 175 hp (130 kW) D6R XL and XR, and the 185 hp (138 kW) D6R XL (IG) and D6R LGP.
The D7R Series II at 240 hp (180 kW) power and an operating weight of around 20 tons, is in the middle of Caterpillar's track-type tractors, which range in size from the D3 77 hp (57 kW), 8 short tons (7.3 t), to the D11 935 hp (697 kW), 124 short tons (112 t). It is primarily used to move material short distances or through challenging terrain.
The cylinder size is 5.71 inches x 6.38 inches bore/stroke. The engine can produce up to 1900 horsepower at 2300 rpm. The peak torque of 5532 lb-ft occurs at an engine speed of 1300 to 1800 RPM. The engine weighs over three tons at 6780 pounds. The C32 is used in CAT equipment including the 777G mining truck and the D11T bulldozer.
The Navistar VT engine family is a line of diesel engines that was produced by International Truck and Engine (Navistar International) from 2003 to 2016. Developed as the replacement for the T444E V8, the VT V6 and V8 diesels were the smallest diesel engines used in Navistar vehicles, slotted below the DT inline-6 engine family.
1987: D8N (285 hp [213 kW]) with differential steer transmission, the first track-type Caterpillar tractor to have one (the new D8N was smaller than the old D8L size, which was replaced by the new D9N model). 1996: 305 hp (227 kW) D8R replaced D8N. 2000: D8R Series 2 replaced the D8R. 2004: 310 hp (230 kW) D8T ACERT replaced D8R Series 2. [2]
The 370 hp (280 kW) D9N replaced D8L in 1987 (this was due to a model number/size adjustment by Caterpillar in their larger bulldozer lineup at the time, allowing them to introduce a smaller D8N model below the larger D8L size). Due to the model adjustment, the D9L is the most powerful D9 in history, with a flywheel power of 460 hp (340 kW).
The cylinder size is 5.12 × 6.18 bore/stroke. Engine ratings were available from 380–525 horsepower at 2100 RPM. The peak torque occurs at an engine speed of 1200 RPM. [2] The engine weighs over one ton at 2610 pounds. The Cat C13 is often used in Class 8 vehicles (tractor-trailers).
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