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VVA (Variable Valve Actuation)
Improves the combustion by providing optimized breathing according instant revs and load conditions. Increases the power output at high revs, improving at the same time the torque curve, the clean exhaust and the economy everywhere.
The intake manifold and its vacuum, the throttle valves and the additional - if any - Variable Valve Timing (VVT) system can be "thrown away", as the VVA controls completely and effectively the breathing process.
Compact and light, can be installed on existing engines even without increasing their external dimensions.
It may sound bizarre, but the roller version of VVA "results" throwing away many parts from the mechanism of the present "State of the Art" / "champion" engine and rearranging the remaining parts, achieving not only two step operation, offered by the "State of the Art", but infinite steps, i.e. permanently optimized breathing according instant operational conditions.
Compared to its "continuously variable valve actuation" competitors, the present VVA achieves more, being at the same time markedly simpler, reliable, autarkic, able for really high revs etc.
After thousands of Kilometers, in and around Athens, with the first ever made prototype, the VVA system has proven, in practice, better than any expectations.
PPE (Pulling Piston Engine)
Provides additional time for the combustion, combined to compact and light construction. The typical modern Diesels in passenger cars offer their maximum power output at around 4.000 rpm. A diesel capable to burn efficiently the fuel at 6.000 rpm sounds interesting.
PRE (Pulling Rod Engine)
Provides additional time for the combustion, combined to compact and light construction. The typical modern Diesels in passenger cars offer their maximum power output at around 4.000 rpm. A diesel capable to burn efficiently the fuel at 6.000 rpm sounds interesting. It is interesting, too, a short stroke racing ( like F1 where stroke of 40 mm for 100 mm bore is now the case ) having short connecting rods ( for instance 50 mm from center to center ), less distance from crankshaft to camshafts, more efficient combustion at extreme revs ( i.e. more power ), etc.
Portable-Flyer / LIBELLULA
Top reliability, lightweight and fuel efficient, vibration free, reaction torque free.
Short hub-to-hub distance of parallel/coplanar rotors having long rotor wings.
GRECO (Gentle Rolling Efficient Crankless Operation)
A "first order" cam activates "desmodromically" a reciprocating piston, without crankshaft, without connecting rod. A three cylinder in line even firing becomes perfectly balanced, as perfectly as the Wankel rotary engine. Compact and lightweight compared to competitors. Interesting geometry of cam profile.
Teaching
Very common but also "mind boggling" problems are faced and solved following a simple step by step analysis, using base Euclidian geometry and Newtonian mechanics.
e-mail: vva@pattakon.com
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