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Oil under constant pressure is supplied to the lifter via an oil channel, through a small hole in the lifter body. When the engine valve is closed (lifter in a neutral position), the lifter is free to fill with oil. As the camshaft lobe enters the lift phase of its travel, it compresses the lifter piston, and a check valve shuts the oil inlet ...
Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.
Yet another common problem with the 2005–2016 fourth generation V8 LS engines was a failure of the specialized lifters in engines equipped with the AFM system. While in AFM operation, the lifters would sometimes fail to come out of AFM mode and cause the engine to go into 'limp home' mode.
The 2019-2024 Model Year (MY) Chevrolet Silverado 1500 and GMC Sierra 1500 pickups The 2021-2024 MY Chevrolet Tahoe, Chevrolet Suburban, GMC Yukon, and Cadillac Escalade SUVS
Introduced in 1981, the 2.8 L (2,837 cc) LH7 was a High Output ("Z-code") version of the LE2 for the higher-performance X-cars like the Chevrolet Citation X-11 and higher-performance A-cars like the Pontiac 6000 STE. It retained a two-barrel carburetor and produced 135 hp (101 kW) and 165 lb⋅ft (224 N⋅m) for 1981 and 145 lb⋅ft (197 N⋅m ...
Since the 1960s, Italian motorcycle manufacturer Ducati has used a desmodromic valvetrain to counter this problem and allow for higher engine speeds by using positive closing as well as opening of the valves, without springs. The system consists of a mechanical lifter mechanism that uses a second rocker arm to push the valve closed.
The 2025 Chevy Equinox brings a lot to the party for its very reasonable $30,000 starting price including a turbocharged four-cylinder engine, decent infotainment, available all-wheel drive, and more.
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