Twinport

TwinPort

Updated versions with lighter cast-iron cylinder block and chain-driven camshaft. Features EGR valve and TwinPort technology - twin intake ports with a choke closing one of the ports at low RPM, providing strong air swirl pattern for higher torque levels and better fuel economy.

* 1.4 L (1364 cc): TwinPort, 73.4 mm (2.89 in) bore, 80.6 mm (3.17 in) stroke, 10.5:1 compression, 90 hp (66 kW) and 92 ft.lbf (125 Nm) of torque.
* 1.6 L (1598 cc): TwinPort, 79 mm (3.11 in) bore, 81.5 mm (3.21 in) stroke, 10.5:1 compression, 105 hp (77 kW) and 111 ft.lbf (150 Nm) of torque.

Ecotec TwinPort Family 1 engines are used in:

* 2001 Opel Corsa
* 2003 Opel Tigra
* 2004 Opel Astra


Twinport technology:

Variable Length Intake Manifold (VLIM) is an automobile engine manifold technology. As the name implies, VLIM can vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency.

There are two main effects of variable intake geometry:

* Swirl - Variable geometry can create a beneficial air swirl pattern in the combustion chamber. The swirls help distribute the fuel and form a homogeneous air-fuel mixture which ignites without engine knocking. At low RPM, the speed of the airflow is increased by directing the air through a longer path with limited capacity, but the shorter and more capable path opens when the load increases so that the greater amount of air can enter the chamber. In DOHC designs, the air paths are often connected to a separate intake valves so the shorter path can be excluded by inactivating the intake valve itlself.
* Pressurization - A tuned intake path can have a light pressurizing effect similar to a low-pressure supercharger due to Helmholtz Resonance. However, this effect only occurs over a narrow engine speed band. A variable intake can create two or more pressurized hot spots, increasing engine output.


Din ceea ce citesc eu mai sus ma uimeste o chestie; motoarele Twinport de la Opel au distributia pe lant?

Este si pe lant si pe curea. Nu este un singur model. Am in fata "exploded view" la ambele, dar din pacate nu le pot atasa aici.
Si o documentatie mai completa despre Twinport, daca tot suntem la dictionar:

"OPEL's NEW TWINPORT ENGINE TECHNOLOGY FOR NEW ASTRA

Opel’s exciting new Astra features the latest in engine technology form the German manufacturer for improved engine efficiency. Called “Twinport” by Opel, this latest development is used for the first time in the ECOTEC 1.6 litre engine.

At the heart of the Twinport technology is intelligent variable valve timing and a high proportion of exhaust gas recirculation. By varying the timing of the inlet camshaft and recirculating exhaust gasses, Opel engineers achieved a six percent fuel saving over the previous generation ECOTEc engine. Detailed work by Opel’s powertrain engineering team achieved a further one percent reduction in fuel consumption.

This highly efficient engine design fully meets the strict Euro 4 emission standard in addition to offering a substantial improvement in fuel economy. “Opel’s new ‘Twinport’ technology will offer our customers an intelligent and very user friendly boost to fuel economy when it arrives in South Africa in the new Opel Astra,” says Malcolm Gauld, GMSA’s Sales and Marketing Director. “Twinport is typical of Opel’s new approach to vehicle design as the company strives to offer advanced technology that benefits operating efficiencies at affordable prices.”

With the Twinport system, the ECOTEC 1.6 engine receives up to 25% of its cylinder charge from previously burnt exhaust gas which is routed through a link to the exhaust manifold. By doing this induction losses under part load are significantly reduced as the engine does not have to work as hard to charge the cylinders on the intake stroke.

The advanced design of the intake ports, there are two per cylinder as the name ‘Twinport’ suggests, allows efficient combustion of a very lean mixture. Under part load one of the two ports is closed by a flap valve to ensure a high level of combustion chamber swirl and efficient mixing of the fuel/air mixture for complete and reliable combustion.

Along with the new ‘Twinport’ technology comes a host of detail changes to the engine 1.6 ECOTEC engine design. The design of the engine block has been optimised in terms of weight and vibration, and the valve gear is now smoother and has reduced friction losses. Auxiliary items such as the water pump have been relocated for easier engine assembly and enhanced overall quality in this new era engine that represents state-of-the-art technology in its class.

The new ECOTEC ‘Twinport’ engine from Opel will be seen for the first time in South Africa in the new Opel Astra which is due for launch in the near future.

Ends.

Issued by: John Elford;
Product Communications,
General Motors South Africa
Tel: 011 806-4607; Cell: 082 371 4273
email:john.elford@gmsa.com


"Twinport" - Variable Intake Control for Low Fuel Consumption
Opel adopts new economical technology for small-displacement gasoline engines

Fuel-saving potential close to gasoline direct injection
Smart solution makes useful technology affordable
Ready for production this year

Rüsselsheim. With an innovative variable intake control system called "Twinport", Opel plans to reduce the fuel consumption of small gasoline engines (up to a maximum size of 1.6 liters) by as much as six percent. The smart solution employs a variable intake manifold in combination with a high rate of exhaust gas recirculation. The "Twinport" technology works in conjunction with engines with four valves per cylinder, a requirement fulfilled by Opel's complete ECOTEC range.

"Twinport" controls the supply of the fuel-air mixture to the cylinders according to the engine's actual needs. At part load, one of the two intake ports leading into the cylinder is throttled. This causes an intensive swirl effect to develop as the mixture enters the cylinder, which in turn makes the engine more economical when operating with a high proportion of recirculated exhaust gas. At full load, on the other hand, the throttling device is opened, the cylinder receives a greater charge of mixture and full power is developed. By adapting the swirl movement of the incoming charge to suit engine operating conditions, maximum fuel economy is always achieved.

"One of the advantages of the "Twinport" technology is that the proven intake-port fuel injection system and the principle of exhaust emission control by three-way catalytic converter can be retained," explains Hans H. Demant, Opel's Executive Director, Engineering. "This limits the extent of the technical modifications and in turn makes it possible to offer our customers this technical development at an affordable price. For this reason we regard variable intake control as an intelligent approach to the task of reducing fuel consumption on small gasoline engines." Extensive tests carried out by Opel Powertrain's experts have confirmed that these smaller engines, if equipped with "Twinport", can achieve at least 80 percent of the fuel savings expected from an engine using gasoline direct injection and the stratified-charge principle.

The gasoline engine's relative weakness in fuel consumption compared to diesel units is due largely to throttling losses. The easiest way of minimizing these losses is by increasing the amount of exhaust gas in the fuel-air mixture - in other words exhaust from preceding combustion cycles is recycled back into the combustion chambers and blended into the fresh mixture. However, in order to maintain rapid, stable combustion at high rates of exhaust gas recirculation, charge movement must be intensified. This is precisely what Opel's engineers have achieved with their variable intake control system: at partial load one of the two intake ports to each cylinder of the four-valve engine is partly blanked off by closing a throttle just before the mixture reaches the intake valve. As a result, the mixture enters the cylinder at an angle. This creates a swirl effect around the cylinder axis and ensures that combustion takes place reliably and completely. If the driver calls for full power from the engine, however, the second intake port is re-opened fully to make sure that the maximum mixture charge enters the cylinder.

For successful use of the shutdown principle, the intake ports and the mixture formation process before and after entering the cylinders had to be optimized. To achieve this, Opel's engineers made simultaneous use of computer-based flow simulation and video observations on actual engines. The outcome of their efforts: the modified engines reduced the car's fuel consumption by six percent when put through the standard test cycle.

In the words of Dr. Uwe-Dieter Grebe, the engineer responsible for gasoline engine development at Opel Powertrain GmbH: "Our experimental work has clearly proven that variable intake control in conjunction with high exhaust gas recirculation rates achieves approximately the same reduction in fuel consumption on small-displacement engines as the far more complex direct gasoline injection principle". Grebe's conclusions: "For the smaller engines that are used in compact and lower midsize cars in particular, "Twinport" is an intelligent and simple means of improving the engine's operating characteristics."

Si peste doi ani este bine:

OPEL's New TWINPORT tehnologia motoarelor pentru New ASTRA

Opel Astra de noi caracteristici târziu în domeniul tehnologiei motoarelor forma de producãtorul german pentru o mai bunã eficienþã a motorului. Numit "Twinport" de Opel, aceasta ultima dezvoltare este utilizat pentru prima datã în ECOTEC motor de 1.6 litri.

În centrul de Twinport tehnologie este inteligent variabilã supapã de timp ºi o mare parte din gazele de eºapament de recirculare. Prin diferite calendarul de admisie camshaft ºi recirculating evacuare gasses, Opel ingineri au realizat o economisire de combustibil ºase la sutã faþã de generaþia anterioarã ECOTEc motor. Detaliate de lucru de Opel a powertrain inginerie realizat o nouã echipã de un procent de reducere în consumul de combustibil.

Acest motor de design extrem de eficiente în totalitate îndeplineºte stricte de emisie Euro 4 standard, în plus faþã de oferirea unei îmbunãtãþiri substanþiale în economia de combustibil. "Opel e nou" Twinport "tehnologie va oferi clientilor nostri o foarte inteligent ºi prietenos pentru a impulsiona economia de combustibil, atunci când aceasta ajunge în Africa de Sud în noul Opel Astra", spune Malcolm Gauld, GMSA de director de vânzãri ºi marketing. "Twinport este tipic de Opel a nouã abordare a vehiculului de design ca societatea face eforturi pentru a oferi tehnologie avansata care beneficiazã de operare eficienþã la preþuri accesibile."

Cu Twinport sistem, motor ECOTEC 1.6 primeºte pânã la 25% din taxa de la cilindru anterior de evacuare a gazelor arse, care este direcþionat printr-un link pentru a galeriei de evacuare. Astfel de inducþie pierderi sub sarcinã parþialã sunt în mod semnificativ reduse ca motorul nu are cum sã lucreze din greu pentru a încãrca cilindri pe aportul de accident vascular cerebral.

Avansate de proiectare a aportului de porturi, existã douã pe cilindru ca denumirea "Twinport" sugereazã, permite eficient de ardere a unui amestec foarte inclinati. În conformitate cu partea de încãrcare a uneia din cele douã porturi este închis de un flap supapã pentru a asigura un nivel ridicat de camera de combustie de turbulenþã ºi eficient amestecul de combustibil / aer pentru amestec complete ºi fiabile de ardere.

Odata cu noua "Twinport" tehnologie vine o serie de modificãri la detaliu motorul 1.6 ECOTEC motor de design. Design-ul de la bloc motor a fost optimizate din punct de vedere al greutãþii ºi vibraþii, precum ºi supapã de viteze este acum fine ºi-a redus pierderile de frecare. Auxiliar de elemente, cum ar fi pompa de apã s-au mutat de mai uºor motor de montaj ºi îmbunãtãþit calitatea generalã în aceastã nouã erã a motorului, care reprezintã state-of-the-art tehnologie din clasa sa.

Noul ECOTEC "Twinport" motorul de la Opel va fi vãzut pentru prima datã în Africa de Sud în noul Opel Astra, care se datoreazã pentru lansare în viitorul apropiat.

End-uri.

Emise de: John Elford;
Produs de comunicaþii,
General Motors, Africa de Sud
Tel: 011 806-4607; Mobil: 082 371 4273
e-mail: john.elford @ gmsa.com


"Twinport" - Variabila de admisie pentru Min control consumul de combustibil
Opel adoptã noi tehnologii economice de mici de deplasare motoare cu benzinã

Potenþialul de economisire a combustibilului aproape de benzinã injecþie directã
Smart soluþie face util tehnologia accesibile
Eºti gata pentru producþie în acest an

Rüsselsheim. Cu un aport inovatoare variabila sistem de control numit "Twinport", Opel planuri de a reduce consumul de combustibil de mici motoare cu benzinã (de pânã la o dimensiunea maximã de 1,6 litri) de la fel de mult ca ºase la sutã. Smart soluþie angajeazã o variabilã galeriei de admisie, în combinaþie cu o ratã ridicatã de recirculare a gazelor de evacuare. The "Twinport" tehnologie de lucrãri în legãturã cu motoare cu patru supape pe cilindru, o cerinþã îndeplinite de Opel-ul complet al ECOTEC gamã.

"Twinport" controale de furnizare de combustibil-aer amestec cu cilindri în funcþie de nevoile reale ale motorului. La partea de încãrcare, una dintre cele douã porturi aportul lider în cilindru este Throttled. Acest lucru determinã o intensã anafor efect sã se dezvolte ca amestecul intra in cilindru, care, la rândul sãu face motorul mai economice, atunci când opereazã cu o mare parte din gazele de eºapament recirculated. La sarcinã maximã, pe de altã parte, de supraîncãrcarea aparatul este deschis, de cilindru primeºte o taxã mai mare de amestec ºi plin de putere este dezvoltat. De adaptare a anafor circulaþie din taxa de intrare pentru a se potrivi cu motorul în condiþii de funcþionare, maxim de carburant este întotdeauna realizat.

"Unul dintre avantajele de" Twinport "tehnologie este doveditã de faptul cã aportul-port sistem de injecþie de carburant ºi a principiului de control al emisiilor de gaze cu trei cãi convertor catalitic poate fi pãstrat", explicã Hans H. Demant, Opel a directorului executiv, Inginerie . "Acest lucru, în mãsura în limitele de modificãri tehnice ºi, la rândul sãu, oferã posibilitatea de a oferi clientilor nostri acest dezvoltarea tehnicã la un preþ accesibil. Din acest motiv, noi considerãm variabilã aportul de control inteligent ca o abordare a sarcinii de a reduce consumul de combustibil pe mici motoare cu benzinã ". Posibilitîþi de teste efectuate de Opel Powertrain experþii au confirmat faptul cã aceste motoare mai mici, dacã este echipat cu "Twinport", se poate obþine cel puþin 80 de procente din economii de combustibil de aºteptat de la un motor cu benzinã, folosind injecþie directã ºi stratificat-taxa principiu.

De benzinã a motorului relativã slãbiciune în consumul de combustibil comparativ cu motor diesel de unitãþi se datoreazã în mare mãsurã la supraîncãrcarea pierderi. Cea mai simplã modalitate de minimizare a acestor pierderi este prin creºterea cantitãþii de gaze de eºapament în amestec de combustibil-aer - cu alte cuvinte de evacuare de la cicluri de ardere precedent este reciclat înapoi în camerele de ardere ºi amestecaþi în stare proaspãtã amestec. Cu toate acestea, în scopul de a menþine rapid, stabil de ardere, la rate ridicate de gaze de eºapament de recirculare, taxa de circulaþie trebuie sã fie intensificate. Aceasta este exact ceea ce Opel a ingineri au realizat cu aportul lor variabilã de sistem de control: la sarcinã parþialã a uneia din cele douã porturi aportul la fiecare cilindru de patru supapã de motor este parþial blanked afara de închidere o acceleratie, chiar înainte de amestec ajunge la ventil de admisie. Ca rezultat, în amestec intrã în cilindru la un unghi. Acest lucru creeazã un efect de turbulenþã în jurul axei cilindrului ºi se asigurã cã ardere are loc fiabil ºi complet. În cazul în care conducãtorul auto apeluri pentru întreaga putere de la motor, cu toate acestea, cel de-al doilea port aportul este re-a deschis complet pentru a se asigura cã maximã amestec taxa intra in cilindru.

Pentru a utiliza cu succes de închidere principiu, aportul de porturi ºi de procesul de amestec de formare, înainte ºi dupã intrarea în cilindri au trebuit sã fie optimizate. Pentru a realiza acest lucru, inginerii Opel a fãcut utilizarea simultanã a computer bazat pe fluxul video de simulare ºi observaþii cu privire la motoare de real. Rezultatul eforturilor lor: de motoare modificate a redus consumul de combustibil auto este de ºase la sutã, atunci când pune prin ciclu standard de testare.

În cuvintele de Dr. Uwe-Dieter Grebe, inginer responsabil pentru benzina motor de dezvoltare de la Opel Powertrain GmbH: "Our activitatea experimentalã a dovedit în mod clar cã variabila aport de control în legãturã cu un grad ridicat de gaze de eºapament de recirculare tarife atinge aproximativ aceeaºi reducere a consumului de carburant pe mici-ca motoarele de deplasare mult mai complex benzinã injecþie directã principiu ". Grebe concluziile: "Pentru motoare mai mici, care sunt utilizate în compact ºi mijlocii masini mai mici, în special," Twinport "este un mijloc simplu ºi inteligent ºi de a îmbunãtãþi caracteristicile de funcþionare a motorului."

Nu sunt un as in limba engleza ,traducerea de sus este facuta de un translator software si acuma am rectificat eu fraza, va rog sa-mi spuneti daca am deranjat cu ceva,oricum, multumesc de observatie.

Ideea de baza la Twinport e urmatoarea: exista doua valve de admisie pe fiecare cilindru. La turatii joase (pana in 3000 de ture), una din valve este partial inchisa, astfel incat sa se formeze o usoara "turbulenta", amestecul carburant facandu-se mai eficient, iar la peste 3000 de ture valva este deschisa complet, pentru a oferi putere maxima.