A unique characteristic of Cummins diesel engines is that, until very recently, they used grid heaters instead of glow plugs. Over a production run of nearly two decades, the design of Cummins ...

Jim Park: Cummins says its new X15N natural gas-powered 15-liter engine offers diesel-like performance. Does it really? Let’s find out. And if you haven’t already seen it, check out our X15 ...