We may receive a commission on purchases made from links. While browsing auto repair and maintenance tools at your local parts store, you've likely come across compression testers like the Orion Motor ...

Every car engine has quite a few details, ranging from cylinder count to compression ratios. How does changing the ...

As you may know, an engine's compression ratio is directly linked to its combustion efficiency. All else being equal, higher-compression engines tend to make more power while offering better fuel ...

Millions of drivers are paying extra for premium gas and getting absolutely nothing back.