The Ultimate Glossary of Engine & Powertrain Terms
Your Guide to Understanding the Language of Engines When it comes to replacing or repairing an engine, the terminology alone can feel overwhelming. Whether you’re a vehicle owner, repair shop, or fleet manager, understanding common engine and powertrain terms can help you make smarter, more confident decisions. At Tri Star Engines, we specialize in remanufactured engines and powertrain components built to meet or exceed OEM standards, helping customers get reliable, long-lasting performance. This glossary breaks down essential terms you’ll encounter when shopping for or discussing engines, transmissions, and related components. A Aftermarket Parts Components made by third-party manufacturers rather than the original equipment manufacturer (OEM). Quality can vary depending on the supplier. Air-Fuel Ratio The balance of air and fuel