Sequential Vapour Injection from Romano.

The Sequential Vapour Injection system available from Romano in Italy.

SVI uses an injector for each engine cylinder which is installed by removing the inlet manifold and drilling a hole close to the inlet valve. The injectors are then connected via a wiring loom to an ECU (Computer). The ECU measures various engine sensors and determines from a 'Map' how much gas to inject into each cylinder. This happens many times per second and after installation the system learns the engine characteristics. In addition it uses the Lambda sensors fitted to all modern engines (post 1994) to detect the exact amount of oxygen remaining in the exhaust gasses and uses this to fine tune the fuel metering. This is known as 'Closed Loop' operation and ensures maximum engine performance and economy that cannot be matched by the older Mixer systems.

Of course this complexity means that the SVI system is more expensive and takes longer to install, but it results in an installation that offers virtually identical performance and fuel economy given with Petrol - at less than half the cost!

The SVI Nii system is now upgradeable so it is able to be brought up to date each time the car comes in for service.

The New Sequential vapour injection Systems have a built in pressure sensor that will detect when you run out of gas by the loss of pressure to the distribution rail. when this happens the system will change back to petrol automatically and the hand set will bleep and flash at you, to tell you it has changed over. to turn off the bleep you touch of the white button.  

The hand set is also your manual override so that you can change back to petrol at the touch of the white button. 

The Romano Sequential Vapour Injection system injectors are one of the few injection systems that is dirt tolerant, as contamination was a big problem in the past, Romano went all out to produce a injector, with a very fast opening, and closing speed, with the added back up that it could accommodate, small contaminates within the LPG, all the larger contaminates would have been stopped by the Filter solenoid.

Applications
Can be installed on almost any vehicle that has a Lambda sensor and ECU (nearly all post 1992 vehicles). It is available for all engines from 3 to 8 cylinders, V10 and V12 conversions are available for specific models.

Key Benefits
no chance of backfiring and consequent damage
Better performance at high RPM

Only a very small loss on MPG compared to Petrol

Disadvantages
Complex to install - the inlet manifold is modified to accommodate the injectors.
Installing the system and then mapping the ECU full install can take up to 3 days.