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Agis I-12 - new injectors from App Studio
Once Apis, now Agis
App Studio's first injector rails, then introduced under the name Apis, were launched in 2008. Apis Solo single injectors soon followed. The new Agis injectors have gone a major redesign aimed at eliminating as many metal elements as possible. This approach enabled the manufacturer to rely more on plastic injection moulding machinery, which makes the production process cheaper (thanks to automatisation) without sacrificing quality or repeatability.
When designing the Agis I-12 injectors, emphasis was put on making their operational parameters optimal in low ambient temperatures, particularly at the moment of switching over to gas.
Polish climate proves very demanding for injectors – during the summer they have to work under extremely high temperatures, while in the winter, when temperature falls to -20 degrees Celsius or even below, the first petrol-to-LPG switchover (especially when the switchover temperature threshold is set low) may be not very fluent or even result in stalling the engine.
Tests held during Polish winter proved very successful. Test cars' engines worked steadily after switchover, with no rev speed fluctuations or tendencies towards stalling. This means oily fractions included in LPG, which tend to build up on autogas system components (including injectors) have little influence over performance of the new Agis injectors.
The most important modification
As compared to earlier models of App Studio's injectors, the new Agis has been modified in terms of magnetically-operated opening and closing. The gas flow opening element is pulled by an electromagnet at much higher force, which allows to shorten the opening time and improves low temperature performance.
A plastic body
The injector body has been made of plastic instead of metal, which too influences the Agis' low temperature performance. Thanks to this the I-12 has low thermal inertia – it needs relatively low amount of warmth to warm up, which is crucial for low-temperature switchovers.
The Agis I-12 injectors are much more compact than their Apis Solo predecessors and can be used for single applications (not necessarily on a rail). This means they can be placed closer to the intake manifold of an engine, which enhances the engine's performance on LPG.
Future (rail application)
Due to large market demand, as soon as in 2013 the Agis I-12 will be prepared for assembling single injectors into rails. Many installers prefer rails since they consider using them as less time-consuming than mounting single injectors in the engine bay of a converted car. The rail will hold up to four injectors and will be equipped with temperature sensor and MAP sensor connectors. If the system to be fit does not require a temperature sensor, its connector may be used for fitting a fifth injector. When converting 2- or 3-cylinder cars, the redundant connectors can be blinded. The rail-ready Agis I-12 will be mildly modified, but will retain the single application option.
To sum up
Addressing the needs of installers and market demands is a very valuable feature in Polish autogas components manufacturers' approach. However, certain balance is also required to decide what is and what is not important and what may help the majority of installers. Adapting the Agis I-12 injectors for use in rails will definitely make things easier for many.
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