We may receive a commission on purchases made from links. I have been working on my own vehicles for almost 40 years and in that time have accumulated a sizable collection of tools. The bulk of them ...

An engine's static compression ratio is only a rough indicator of its ability to tolerate a particular gasoline octane ratio. The real key isnumbers. Most engine builders say 175 to 185 psi cranking ...

A compression test reveals the condition of your engine's valves, its valve seats, and piston rings and whether these parts are wearing evenly. Healthy engines should have compression over 100 psi per ...