Over the past several years, additional rumors have surfaced that Toyota could offer their own 4.5L V-8. More recently, Toyota showed interest in Cummins' 5.0L V-8; the same engine currently offered in the Nissan Titan XD. Despite numerous rumors, years of taunting, and a variety of available options, the Tundra remains without a diesel option.
Hino Motors is a Japanese based truck manufacturer primarily engaged in the medium and heavy duty truck market. In addition to building trucks, the company boasts a portfolio or medium and heavy duty diesel engines. Hino is the leading manufacturer of such trucks in the Asian marketplace.
8.0L Hino J08E-TB Quick Specs
Configuration | Inline 6 cylinder |
Displacement | 8.0 liters |
Bore x Stroke | 4.41" x 5.12" |
Injection | High pressure common rail |
Aspiration | Single turbocharger, intercooled |
Horsepower | 260 hp @ 2,500 rpm |
Torque | 585 lb-ft @ 1,500 rpm |
4.5L Toyota Diesel V-8 Quick Specs
Configuration | V8 Turbodiesel DOHC |
Displacement | 4.5 liters |
Block/Head Material | • Compact graphite iron (CGI) block. • Cast aluminum cylinder heads. |
Injection | High pressure common rail |
Aspiration | Twin turbocharged |
Horsepower | 265 hp @ 3,400 rpm |
Torque | 480 lb-ft @ 1,600 rpm |
5.0L Cummins Quick Specs
Configuration | 90 degree V-8 |
Displacement | 5.0 liters, 305 cubic inches |
Block/Head Material | CGI engine block, aluminum alloy cylinder heads |
Injection | High pressure common rail |
Aspiration | Single sequential turbocharger |
Horsepower | 310 hp @ 3,200 rpm |
Torque | 555 lb-ft @ 1,600 rpm |
Toyota representatives have been quoted saying, "[The Tundra] may be offered with an all new clean-diesel option in the near future." While the 8.0L Hino powered truck was a neat concept, it was far from realistic. Meeting fuel economy demands and emissions regulations on such a large engine would likely curb popularity. Not to mention, 8 liters of engine weighs in at 1,500 lbs, giving the truck a hefty curb weight. Since the 4.5L engine already exists in Toyota's portfolio, we expect that if and when Toyota decides to move into the diesel market, the engine will be seriously considered.