For the most part, they've got two valves per cylinder — one intake and one exhaust. There's nothing wrong with them, though, and they still produce a lot more horsepower for their size and get ...

Modern internal combustion engines — including those that run on diesel fuel — require a lot of special parts and systems to prevent dumping excess emissions into the atmosphere. Not only are ...

Prepping my WRX for heat wrapping the exhaust! Follow along as I remove the exhaust, replace the valve cover gaskets, and get everything ready for better performance. Judge Orders Trump ...

The positive crankcase ventilation valve releases exhaust gas and unburned fuel from the engine block into the intake manifold. All engines allow some exhaust gases, unburned fuel and oil to ...