The Navistar DT engine family is a line of mid-range inline-6 diesel engines ( Figure 1). The Legend DT 466 is a four-cycle, six-cylinder engine with 466 cubic inches of displacement. The bore and stroke are 4.59 by 4.68 inches (116.5 by 118.9 mm). ![]() The compression ratio is 16.5:1. The maximum power output is 260 horsepower at 1,900 rpm while the maximum torque output is 800 ft-lbs. At 1,400 rpm. The engine uses direct fuel-injection combustion technology and the aspiration system is turbocharged with wastegate technology and an air-to-air intercooled design. The governed engine speed is approximately 2,500 rpm. With horsepower ratings ranging from 170 hp (130 kW) to 350 hp (260 kW), the Navistar DT engines are used primarily in medium-duty truck and bus applications, although prior to 1986 Navistar International, then known as International, the DT engine was used in farm and construction equipment. The DT engines are of a wet-sleeve design. This means that the cylinder wall (sleeve) is a separately machined part that fits into upper counter bores for sealing at the top with O-ring housing bores cast into the engine block in the bottom. The cylinder sleeve is in direct contact with the engine coolant, hence the “wet” sleeve. These sleeves are prefinished and do not require honing after installation. They also allow for easy in-frame overhauls during service. This design is commonplace in larger displacement diesel engines and is considered one that enhances durability because the consistent wall thickness of the sleeve allows for even heat transfer, ensuring the cylinders stay round during thermal expansion. Additionally, it gives the ability to use a hardened cylinder sleeve that is more durable and wear resistant than a softer, cast-in wall. 90 hp optimax reviews. Also, the replaceable cylinder sleeves protect the block from damage (e.g. In case of foreign objects entering the cylinder) and can easily be replaced, which enables simpler restoration to original specifications. The 466, however, being a high production mid-range diesel, is somewhat unique in its wet-sleeve design, because nearly all the other high production mid-range engines are in-place cylinder blocks.
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