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SAE technical paper series, Volume 980768.
A new fully mechanical valve timing mechanism for continuous control of valve lift, duration and phase angle has been developed... 
Variable valve timing | Kinematics | Valves | Valve trains | Spark ignition engines
eJournal
SAE technical paper series, Volume 880386.
This paper presents a broad review of the whole subject of variable valve timing applied to both gasoline and diesel engines, including related technology such as the use of supplementary valves... 
Variable valve timing | Maintainability and supportability | Spark ignition engines
eJournal
SAE technical paper series, Volume 921479.
The optimization of valve train actuation for internal combustion engines through the fixed geometry camshaft is a compromise between the required torque, the fuel consumption, idle characteristics and exhaust emissions... 
Variable valve timing | Simulation and modeling | Camshafts
eJournal
SAE technical paper series, Volume 910445.
While Variable Valve Timing (VVT) holds the potential to alleviate some of the compromises normally associated with engine operation over broad speed and load ranges, generalizing its benefits in a quantitative manner is difficult... 
Variable valve timing | Exhaust emissions | Vehicle performance | Spark ignition engines | Emissions
eJournal
SAE technical paper series, Volume 960590.
This paper describes an investigation of implementing variable valve timing with the use of a secondary valve in the intake tract The secondary valve acts in series with the conventional poppet valve... 
Variable valve timing | Sensors and actuators | Valves | Spark ignition engines
eJournal
SAE technical paper series, Volume 970335.
.... The secondary valve is not required to withstand the temperatures and pressures of combustion, and therefore can be of relatively lightweight design, so that it is easier to adjust the timing... 
Variable valve timing | Performance tests | Parts | Spark ignition engines
eJournal
SAE technical paper series, Volume 2007-01-1297.
.... They are used to control the opening timing, duration, and lift of both intake and exhaust valves... 
Thermodynamics | Variable valve timing | Valves | Adaptive control | Spark ignition engines
eJournal
SAE technical paper series, Volume 891990.
The valve timing of internal-combustion engines usually represents a compromise with regard to the requirements placed on power output and torque... 
Exhaust gas recirculation (EGR) | Variable valve timing | Vehicle performance | Spark ignition engines
eJournal
SAE technical paper series, Volume 2007-01-3615.
Honda has developed the Compressed Natural Gas (CNG) engine with Variable Valve Timing Electronic Control... 
Variable valve timing | Valves | Engines
eJournal
SAE technical paper series, Volume 2006-01-0602.
Variable valve timing (VVT) unit, which is able to decrease environmental load and improve fuel economy is loaded onto many automobiles recently... 
Variable valve timing | Powder metallurgy | Engines
eJournal
SAE technical paper series, Volume 980765.
A continuously variable valve timing system called the “Meta VVH System” is presented. It allows the unthrottled load control of spark ignition engines... 
Variable valve timing | Fuel economy | Valve trains | Spark ignition engines
eJournal
SAE technical paper series, Volume 2004-01-0499.
Variable Valve Timing (VVT) is a new technology that provides many opportunities for P/M components. A VVT device... 
Variable valve timing | Crankshafts | Powder metallurgy | Camshafts
eJournal
SAE technical paper series, Volume 2013-24-0055.
...) engine with tumble intake portrait The in-cylinder flow is controlled by variable valve timing (VVT... 
Combustion and combustion processes | Variable valve timing | Valves | Engine cylinders
eJournal
SAE technical paper series, Volume 2013-24-0055.
...) engine with tumble intake portrait The in-cylinder flow is controlled by variable valve timing (VVT... 
Combustion and combustion processes | Variable valve timing | Valves | Engine cylinders
eJournal
SAE technical paper series, Volume 880390.
Variable Valve Timing (VVT) has been demonstrated by other authors as a means of improving engine performance and idle quality... 
Variable valve timing | Fuel economy | Valves | Vehicle performance
eJournal
SAE technical paper series, Volume 2015-01-1748.
In this study, the effects of Variable Valve Timing (VVT) on the performance of a Homogeneous Charge Compression Ignition (HCCI... 
Combustion and combustion processes | Variable valve timing | HCCI engines
eJournal
SAE technical paper series, Volume 980769.
VAST is a variable timing system developed for spark-ignition and compression-ignition engines... 
Diesel / Compression Ignition engines | Variable valve timing | Valve trains | Spark ignition engines | Camshafts
eJournal
SAE technical paper series, Volume 930878.
.... Some engines in production are therefore incorporated with variable valve timing (VVT) mechanisms. All of such mechanisms available today however are for two-mode change-over between low-and high-speed operations... 
Variable valve timing | Fuel economy | Vehicle performance | Cams
eJournal
SAE technical paper series, Volume 740102.
The development of a variable valve timing (VVT) camshaft was initiated as a potential means of controlling exhaust emissions from a spark ignition piston engine... 
Variable valve timing | Performance tests | Splines | Emissions control | Camshafts
eJournal
SAE technical paper series, Volume 2004-01-1869.
.... This paper describes a study on the technology behind the electromagnetic variable valve timing mechanism... 
Diesel / Compression Ignition engines | Variable valve timing | Fuel economy | Valve trains | Spark ignition engines
eJournal
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