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This listing has ended. The seller has relisted this item or another one like this. Item:BOSCH TYPE II UPRATED FUEL INJECTOR 'Brown Tops' |
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BOSCH TYPE II UPRATED FUEL INJECTOR (brown tops). Part Number INJ2010. 250cc.min flow at 2.5 bar. These injectors are not suitable for use with standard fuel injection systems. The ECU must be reprogrammed otherwise the engine may flood and will be damaged. The standard Lucas fuel injector is a "disc" type design that dates back to 1984 - over twenty years ago! It is cheap to manufacture, and very quiet in operation. However it is not so good at atomizing fuel as other designs, and this leaves scope for improvement. This injector design has been used with all Lucas 14CUX and GEMS fuel systems up to 1999.
In the simplest terms, fuel droplets burn from the outside in. It follows that the smaller they are the quicker they burn, hence releasing more of the energy contained in the fuel. Ultimately this gives the most efficient use of the fuel, and the cleanest exhaust emissions. There is a minimum size for fuel droplets, but it is not seen outside of Formula One where no engineering effort is spared.
Ever more stringent emissions legislation has driven improvements in fuel injector design. Improvements in manufacturing technology have produced some far more effective fuel injectors, with the aim of producing more efficient combustion. Some of the best designs are the Bosch Type II and Type III designs, but of course there are still other cheap and nasty injectors available.
During recent testing on standard TVR 5.0 Litre engines, the injectors picked up 8 lb/ft of torque everywhere over a hand-picked flow-matched set of brand new Lucas originals. Interestingly the improved torque was seen with 2-3 Degrees less ignition advance, denoting improved combustion speed and efficiency.
Large output motors (e.g 5.0 Litres) may require more fuel than the Lucas standard versions can provide. In this case it is beetr to use an injector with a larger flow. It is possible to increase fuel pressure to increase flow, but there are limitations.
The "disc" type design features a disc that sits over a metering hole in a plate. The disc is lifted off the hole by the solenoid to allow fuel to flow. The more you increase the fuel pressure, the more difficult it becomes to lift the disc off the hole. There comes a point at around 3.3 Bar where the fuel flow actually starts to drop as you increase the pressure.
Increasing the fuel pressure actually changes the battery voltage corrections required for the injector. This requires the corresponding rework of the ECU software including cranking tables. So it is not just a simple matter of increase the pressure no worries, unless you have no understanding of the implications.
Yet another factor to be considered is that of fuel pump flow rates. Flow rates drop exponentially with increasing pressure, so again it is desirable to keep the pressure as low as possible, commensurate with good atomisation.
In order to remap 5.0 Litre cars, it is almost always necessary to increase the fuel pressure from the standard 2.5 Bar (36PSI) to 3.0 Bar (45PSI). Even with this assistance they are nearing 100% opening at full power. Injectors that are ideally sized should not really be open more than 80% duty cycle, to allow room for transient enrichment and high load operation of a cold engine.
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On 28-Aug-06 at 13:30:26 BST, seller added the following information:
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On 28-Aug-06 at 16:58:38 BST, seller added the following information:
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Postage and packaging Item location: Church Stretton, United Kingdom Dispatches to: Europe, United States, Australia, Canada
*The estimated delivery time is based on the seller's dispatch time, the postal service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
VAT price: 15.0% (included in the listed price). If you have questions about this VAT, please contact the seller. The actual VAT requirements and rates may vary depending on the final sale. | ||||||||||||||
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