They based the BTR-80 on the BTR-70 APC, which itself was based on the BTR-60. It has a single 260-hp V-8 turbocharged water-cooled diesel engine, an improvement over the twin gasoline engines installed in the BTR-60 and BTR-70 vehicles. The reconfigured rear portion of the hull accommodates the new, single engine. The Soviets removed the roof chamfers of the modified BTR-70, raised the rear, and squared off the rearward-sloping engine compartment.