There's a new acronym floating around the performance industry—GDI—and it stands for gasoline direct injection. Among domestic production engines that have jumped heavily into the GDI segment are the ...

Bore and stroke are two important measurements that help determine an engine's power. Here's what they mean and why they're ...

If internal combustion is a war, then pistons are quite literally on the frontlines. Converting reciprocating energy into rotating force means that the four-stroke process tries to both eject the ...

An engine being developed at Ecomotors, Allen Park, Mich., is based on an opposed-piston opposed-cylinder (OPOC) concept updated with the latest computer modeling and thermodynamic analysis Edited by ...

The compression ratio isn’t just a number: it’s one of the greatest determining factors in engine building. Compression ratio determines the type of fuel, how much boost, and has a significant ...

With the combustion chamber being the root of all horsepower, it only makes sense that you start spec'ing an engine build there. One of the key variables in engine building is compression ratio, or ...