Variable Valve Timing Theory and Principles
There’s no doubt that engine specialists will begin seeing more variable valve timing (VVT) designed engines in their shops, as the generation of vehicles equipped with this technology begins to make its way into the service industry. In fact, the current versions of VVT were popularly introduced into domestic production about 10 years ago. Operating
Tech Talk: Why VVT Engines Are Becoming a Reality for Most Vehicles
Variable valve timing can dramatically increase low- and high-speed engine torque, increase fuel economy and reduce exhaust emissions. When the topic of variable valve timing (VVT) comes up, few realize that the concept of increasing low- and high-speed engine torque by automatically advancing and retarding valve timing isn’t a recent development. For example, I recently discovered an
Gasket Surface Machining is Critical to Cylinder Head Repair
According to this representative, the relatively short production life of modern engines also shortens the time that an aftermarket gasket company needs to remedy application-specific cylinder head sealing problems. Another issue is that, if the company develops a superior gasket sealing design for specific applications, the engine might disappear from the market before the company’s
Variety of Oil Blends Required to Meet Today’s Engine Requirements
Yearsago, an import shop could consider its shelves well-stocked if itcontained a selection of single-viscosity oils in detergent ornon-detergent blends. Today, a shop owner is confronted with stocking avariety of multi-viscosity oils, including 0w-20, 0w-40, 5w-20, 5w-30,10w-30, 10w-40, 15w-40 and 20w-50, not to mention stocking some ofthese viscosities in synthetic and non-synthetic bases. Although thenumber
Carburetor Tuning For Performance and Restorations
The modern “square” design of Holley carburetors was popularly introduced during the late 1950s. Because this style of Holley carburetor featured a simple, modular design with interchangeable parts and a great degree of adjustability, it immediately found favor with performance enthusiasts. We’ll use the Holley 4150-series carburetors to illustrate how to select, assemble, adjust and