Is your engine underperforming? Our expert shares how a diesel engine compression test could provide the diagnosis.

355ci Small-Block Modest Mouse vs. LS1 Project Groundhog In case you missed the buildups on the two engines, the first was the 355ci small-block Chevy using a 1986-and-later one-piece rear-main ...

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?

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?