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Chevy Silverado Duramax vs Ram 1500 Ecodiesel: 3.0L Six-Cylinder Diesel Engine Comparison #PTOTY20

The new 2020 Chevy Silverado 1500 3.0L Duramax inline-six cylinder turbodiesel and 2020 GM Sierra 1500 3.0L Duramax inline-six turbodiesel pickups are out and we had one of each on our 2020 Four Wheeler of the Year contest. And we also had a 2020 Ram 1500 Rebel with the newly revised 3.0L EcoDiesel turbodiesel V-6 on the test.

Which Six-Cylinder Diesel Engine is More Powerful

For starters, the 3.0L Duramax delivers 277 horsepower at 3,750 rpm and 460 lb-ft of torque at 1,500 rpm. The 3.0L EcoDiesel delivers 260 horsepower at 3,600 rpm and 480 lb-ft of torque at 1,600 rpm. The 3.0L Duramax makes a little more horsepower and a little less torque than the 3.0L EcoDiesel, but the 3.0L Duramax's torque comes in a little lower in the rpm range and the 2020 GM pickups have the advantage of a 10-speed transmission compared with the Ram's 8-speed transmission, so the 3.0L Duramax is better able to stay in the powerband. But that's not to say the 3.0L EcoDiesel in the Ram 1500 Rebel is a slouch by any means. Both the 3.0L Duramax and 3.0L EcoDiesel offer plenty of horsepower during normal driving for acceleration and passing and more than enough torque to whomp either pickup off the line with a heavy load without problem.

Engine Breakdown

The 3.0L Duramax features a 3.30x3.54-inch bore and stroke compared with the 3.0L EcoDiesel's 3.27x3.60-inch bore and stroke. Both engines are undersquare, capitalizing on a longer torque-producing stroke as compared with modern gasoline engines. The 2020 3.0L Duramax features a 15:1 compression ratio and the 2020 3.0L EcoDiesel has a 16:1 compression ratio, down from the 2019 3.0L EcoDiesel's 16.5:1. The 2020 Ram 3.0L EcoDiesel's lower compression is thanks to a revised combustion chamber. The lower compression of both engines helps reduce noise.

Fuel Economy

And finally, the 3.0L Duramax promises fuel economy up to 29 mpg in the 4x4 Sierra and Silverado while the 3.0L EcoDiesel promises up to 29 mpg in the 4x4 Ram.

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