Twinport

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Twinport is the brand name for an engine technology from the automobile manufacturer Opel , which other manufacturers usually implement with charge movement flaps . The aim is for naturally aspirated four-stroke - gasoline engines , fuel consumption can be reduced. Twinport was introduced in 2003 for all 3- and 4-cylinder engines with four-valve cylinder heads and up to 1.6 liters displacement at Opel and probably worldwide at the General Motors Group (GM).

description

The expression Twinport means - corresponding to the English word twin = twin - that two intake ports are available for each cylinder, one swirl and one filling port. The injection nozzles are located in the intake manifold immediately in front of the intake ports. Both channels are connected by a small "injection window" so that fuel can get into both channels. When the load is below 50 percent, the engine only draws in mixture through the swirl duct. The filling channel is closed by a vacuum-controlled flap. The suction speed increases due to the low cross-section and a tangential flow is created in the cylinder, which creates a flow vortex. This results in a consumption reduction of up to six percent. If the load rises above 50 percent, the flap in the filling channel is opened, since at too high speeds the flow in the swirl channel becomes too fast, which leads to high flow losses.

Executions

The Twinport system was first offered in the Opel Astra and later also in other models. The Twinport units from Opel are available with the following displacement and performance values:

  • 1.0 l Twinport Ecotec (Z10XEP) - 44 kW / 60 PS
  • 1.0 l Twinport ecoFLEX (A10XEP) - 48 kW / 65 PS
  • 1.2 l Twinport ecoFLEX (A12XEL) - 51 kW / 70 PS
  • 1.2 l Twinport Ecotec (Z12XEP) - 59 kW / 80 PS
  • 1.2 l Twinport ecoFLEX (A12XER) - 63 kW / 85 PS
  • 1.4 l Twinport Ecotec (Z14XEL) - 55 kW / 75 PS
  • 1.4 l Twinport Ecotec (A14XEL) - 64 kW / 87 PS
  • 1.4 l Twinport Ecotec (Z14XEP) - 66 kW / 90 PS
  • 1.4 l Twinport Ecotec (A14XER) - 74 kW / 101 PS
  • 1.6 l Twinport Ecotec (Z16XEP) - 76 kW / 103 PS
  • 1.6 l Twinport Ecotec (Z16XEP) - 77 kW / 105 PS
  • Agila A, Corsa C, Corsa D
  • Corsa D
  • Corsa D
  • Agila A, Corsa C, Corsa D
  • Corsa D
  • (Austria only)
  • Corsa D
  • Astra H, Astra Classic II, Corsa C, Corsa D, Meriva A,
  • Corsa D
  • Astra G, later Astra Classic II
  • ( Meriva A and Vectra C , replaced in the Astra H and Zafira B by the Z16XER with 85 kW without twin port but with variable camshaft control )

Something like that

  • In terms of language , double port sounds very similar to Twinport . However, this means two exhaust ports or, in the case of two-stroke engines, two exhaust ports per cylinder, with two exhaust pipes leading away from each cylinder. This technology has advantages in two-stroke engines in order to accommodate large exhaust cross-sections; because slots that are too wide endanger the piston rings, unless a wide slot is interrupted by a web. In addition, several slots allow the designer to influence the mixture flow. Design examples for double port exhaust systems are u. a. with the four-stroke engines some JAP engines, with two-stroke bikes the type MZ ES 250 double port .
  • A speed or load-dependent switchover between two intake paths of different lengths for all cylinders was available at Opel / GM a good 20 years earlier under the name Dual ram (often confusingly written as DUAL-RAM in advertising ) and at BMW as an intake switch tube. Dual ram means: double suction path. This technology was used in 6-cylinder engines from Opel / GM. BMW's intake manifold had a speed-dependent switchover.

The first serially installed variable intake manifold was installed in 1986 in the Porsche 928 S4 (5.0L, 32V, 320PS, model year 1987).

  • The term dual-port RAM is almost confusingly similar in the semiconductor memory technology. These memories enable two read accesses at the same time.

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