Fiind "putin" pasionat de mecanica si "surubareala" , tot "ma izbesc" in cautarile mele de pe internet "recreative" de REALITATEA URMATOARE:
Cat de BUN si performant este motorul in 2 timpi fata de panaramele astea in 4 timpi , complicate si "la jumate" (cand vine vb de lucru mecanic produs) ... nu pot decat sa ma gandesc la O CONSPIRATIE si prostire in masa a oamenilor...
Dintotdeauna "ne-a fost varata pe gat POLUAREA" ce o fac motoarele in 2 timpi!
de ce nu zice nimeni nimic de motorul de la APRILIA SR 50?! CARE ESTE IN 2 TIMPI CU INJECTIE DE COMBUSTIBIL?
Si care-i cat se poate de curat si eficient ( cu 2 litri faci o suta de km SI AI SI PERFORMANTA!... )
Si acum stiu ce o sa zica MULTI : "Nu sunt la fel de performante "rasnitele" astea in 2 timpi , fata de "rachetele supersport" in 4 timpi , in 4 cilindrii ... "
TOTAL gresit :
Other Direct Injection Systems
In the early 1990s, an Australian firm, the Orbital Engine Company, developed a two-stroke automobile engine that met then-current U.S. emissions requirements, exceeded the four-stroke fuel efficiency numbers, weighed almost 200 pounds less than a four-stroke that produced similar power, vibrated less than an equivalent four-stroke and cost from $300 to $500 less to manufacture.
Needless to say, the transportation industries got excited with Orbital’s demonstration. Ford Motor Company, General Motors, Mercury Marine, Outboard Marine Corporation, Polaris Industries, Bombardier — and likely many other engine manufacturers — soon bought patent licenses to use Orbital’s concepts for clean two-stroke development programs.
Automobile companies around the world have launched direct-injection projects, many of which don’t include Orbital’s design. The variety of concepts being developed is impressive and each one seems to confirm the ability to overcome the perceived two-stroke bug-a-boos of suffering from poor economy and high emissions.
Mercury Marine uses Orbital technology in its two-stage, direct-injection two-stroke outboards. The Dodge Neon car was originally slated to have a direct-injected, two-stroke engine, but development of the engine was delayed and a small four-stroke went to production.
Polaris has license to the Orbital patents and has been working on two-stroke engines that are cleaner than its current Cleanfire semi-direct injection systems. Arctic Cat is committed to two-stroke engine designs for its snowmobiles and it is working on direct injection designs.
Yamaha builds two-stroke outboards with High-Pressure Direct Injection (HPDI). The 200 HPDI engine has twin, high-speed fuel pumps that pressurize the gas up to 1,000 psi, and then inject the fuel after the exhaust ports are closed. The system is similar to injection systems on diesel engines.
"Coming Soon? KTM Fuel Injected Two Stroke
By JohnNicholas • on February 15, 2009
ktm_powervalveIt appears that KTM has Fuel Injection ready for two stroke motocross bikes. In the August 2008 issue of Motocross Digital magazine (free subscription available at ) was the following blurb about the KTM effort.
The 250SX could have a bright future, it depends on what happens regarding the rules and regulations: KTM wants them to be introduced to MX2 to allow teams that don’t have millionaire budget to compete against the 4-strokes. For the 2-stroke, the injection is ready, and this would provide cleaner and precise power delivery.
While the idea of fuel injection for two-strokes has been talked about and discussed, there has been little to indicate that it would be workable on a racing two-stroke motocross bike. This news points to the fact that KTM has been working on it for quite some time and seems to have solved the issues that prevented fuel injection for racing two-strokes.
Since this article in Motocross Digital was written some changes have been announced in the FIM rules to allow two-strokes to compete with four-strokes in MX2 (250cc). There are also rumblings that this rule will be applied to the AMA Outdoor Nationals for 2009.
So there is a good chance the Fuel Injected 250SX KTM will be hitting the tracks in the very near future. This is great news for all the two stroke fans of the world.
Two thumbs up for the folks at KTM! "
"Ski-Doo’s E-TEC direct fuel injection technology is perhaps the biggest snowmobile product news for 2009. This technology makes a two-stroke engine burn so cleanly that its emissions ratings are cleaner than some four-strokes, according to Ski-Doo. We don’t doubt those claims.
Pull the rope on a Rotax 600 H.O. E-TEC engine (it takes just one, short-and-quick yank to light it) and there’s no smoke or smell at idle, just a steady, low rumble at precisely 1,200 rpm. Squeeze the throttle to engage the clutches and the sled glides away without a puff of exhaust smoke. Ride one all day and your coat will smell fresh when you return to the cabin or truck. "
"Compania BRP isi extinde tehnologia E-TEC si la modelele de snowmobile Ski-Doo, prin introducerea motorului Rotax E-TEC 800R.
Potrivit producatorului, acest motor in 2 timpi foloseste injectoare electronice sofisticate si un computer central puternic pentru a avea rezultate cat mai performante si eficiente. Motorul debuteaza la modelul in productie limitata Ski Doo MX Z 2010, disponibil numai pe negru.
"Acesta nu este un motor de compromis. Nu numai ca genereaza mai multa putere, dar si stabileste noi standarde in materie de consum redus", a declarat Bob Lumley, vice-presedintele Sales & Marketing Ski-Doo/Sea-Doo." De fapt, noul motor E-TEC 800R consuma cu pana la 37% mai putin decat motoarele produse de competitorii nostri".
Avantajele motorului 800R E-TEC :
• caii putere depasesc PowerT.E.K. 800
• consum redus de combustibil : 12.3 l/100 km
• autonomie imbunatatita (325km)
• consum redus de ulei(450 km/l)
• nu emite fum si nici miros
• emisii reduse fata de alte motoare de 800cc "
MOTOR EVINRUDE V4 60 grade E-TEC
3 year, non-declining
V4 60 deg E-TEC DI
105.4 cu in/1727 cc
Meets Highest Emissions Standards Worldwide
Evinrude/Johnson XD100 Oil
Factory Tunes for High Performance
Full Throttle RPM Range
5500 to 6000 RPM
133 Amps Total Output/50 Amps Net Dedicated
E-TEC DI w/ Stratified low RPM combustion mode
Multi-point, targeted oiling
Bore x Stroke
3.601 x 2.588 in / 91 x 66 mm "