DVVA: mechanical Desmodromic VVA HyDesmo: Hydraulic Desmodromic VVA PatAir: ElectroHydraulic Variable Valve Actuation Variable Valve Actuation Rod version Roller version Rod-Roller version More VVAs Opposed Piston Engines OPRE engine Portable Flyer PatOP engine PatPOC engine Connecting Rod Valves Blade Valve Tilting Valve Port-Less Two-Stroke PatPortLess engine PatMar(ine) engine Variable Compression Ratio (VCR) Head-Block version Rack Gear version Crankshaft version Rotary Engine / Pump Constant Velocity Joint Pulling Piston Engine Other Topics Teaching Stereoscopy Crankless engine Expo Key Advantages Contact

Some technical solutions for internal combustion engines

DVVA
Are Ducati Desmo motoGP engines having top specific-power?
Are BMW valvetronic, Toyota valvematic and Nissan VVEL engines having top fuel-efficiency?
Is the DVVA as desmodromic as Ducati Desmo? Is DVVA rolling friction less power consuming?
Is the DVVA infinite times more variable than BMW's, Toyota's and Nissan's VVAs?

HyDesmo
Does the hydraulic system of Fiat MultiAir open reliably the intake valves of the Alfa Romeo Mito and Giulietta, and of the Fiat 500 TwinAir and Punto?
Has the hydraulic system of Fiat to overcome the tension of the valve restoring springs, too?
Are there any obstacles for not using the hydraulic system to close the valves, as well?
Is the resistance (and the power consumed by the valve train) smaller without valve springs?
Is the mass of the valve assembly smaller, and the rev limit higher, without valve springs?

PatAir
Is the TwinAir of Fiat / INA awarded as the best, by far, engine of the year 2011?
Is the PatAir "Outgoing Air Control" providing, without any cost or complication, an infinity of additional modes that reduce the pumping loss and improve the fuel efficiency of the TwinAir operating at partial loads / low-medium revs, i.e. where a car works most of the time?

OPRE
Can the FEV and AVL rotary Wankel REM (Range Extender Module, for electric cars) be as vibration free as the OPRE REM? Or as fuel efficient as the OPRE REM?
Can the frame of an airplane, or the body of a powered paraglider, be as rid of reaction torque as with an OPRE propulsion unit driving two counter-rotating rotors?

PatOP
Is the single cylinder PatOP more vibration free and more fuel efficient than the two opposed cylinder OPOC engine of Bill Gates? Is the PatOP comprising some 50% fewer parts?
Does the "crosshead architecture" of the PatOP enable a several times lower lubricant consumption than the OPOC? Is this variable capacity more reliable than OPOC's?

PatPortLess
Without ports, is there any reason for the through-scavenged two-stroke PatPortLess engine to consume more lubricating oil than the conventional four-stroke?

PatMar
Are the giant Sulzer, MAN, Wartsila, Mitsubishi etc two-stroke engines the most efficient stand-alone machines today? What is the cost to give them 4-stroke lubrication and 4-stroke scuffing resistance?

PatHead VCR
What more can do the famous SAAB and Toyota VCRs than the simpler, cheaper, quieter, compact, lightweight and robust PatHead VCR?