"Gone is Honeywell's 1,500-horsepower turbine engine, and in its place is a Caterpillar C13D diesel engine that can easily be serviced everywhere in the world. If something went wrong with the old Abrams' engine, it had to be shipped to a big army base to be serviced, but the Caterpillar engine in the M1E3, which makes 690 horsepower in stock form, is widely used in industrial and heavy machinery around the world, so spare parts are much easier to find."
"The Allison Transmission is also out of the picture, with the Army going for a hybridized SAPA transmission that integrates an electric drive unit. It can use the combustion engine and the electric motor at the same time or separately, allowing the three-man crew to sit silently in sensible areas while also having everything powered on. Alex Miller, the U.S. Army's chief technology officer, told The Fast Lane Truck that the M1E3 Abrams is about 20% to 30% lighter than the outgoing model."
The M1E3 Abrams is a diesel-hybrid upgrade built by Roush for the U.S. Army that emphasizes lighter weight and greater efficiency. The design enables rapid global deployment and simpler field servicing. The Honeywell 1,500-horsepower turbine is replaced by a Caterpillar C13D diesel used widely in heavy industry, easing parts availability and maintenance. The Army replaces the Allison transmission with a hybridized SAPA transmission integrating an electric drive unit. The powertrain can operate on diesel, electric, or both simultaneously, allowing low-signature operation. The M1E3 is roughly 20–30% lighter and can achieve up to 50% improved fuel efficiency.
Read at insideevs.com
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