Nissan brought the first, and only, variable-compression engine to market. But its future doesn't look bright.

Some engines use a spark to ignite their fuel, and others rely on compression. What does all of that mean? And how do the two kinds of engines differ?

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 ...

So I found this guy selling a slightly used BMW stroker motor. 3.0 now a 3.4 via big crank, 10:1 compression lightened pistons, 15% flow increase on ported/polished head, mild cam, and a bunch of ...