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The barrell on the top carb has a pocketed torsion spring that is locked in the throttle body and pretensioned with the barrel and locked to the shaft. Throttle lever is between the bottom two bodies. The injection control system is made by Brucato for the V6 Merc engines. I am able to use it because the engine is running the same ignition system as the V6. It receives its information from the 2 ignition switch boxes, air temp sensor and manifold vacuum. No throttle position sensor as manifold pressure serves the same purpose.
Had to make a new fuel rail and made an adjoining manifold rail to tap all reed chambers into common signal. Fuel flow calculations were based on fuel required for 300 HP at 8000 RPM. Rough-fully 55 gallons per hour at a rail pressure of 59 PSI. Tony at Brucato setup a fuel map based on his experiences with the V6 as a starting point. The system allows you to monitor, with a laptop, the engine parameters on the fly and has what Tony calls a steam wheel. This allows leaning and enriching while running like you were adjusting high speed jets on 6 carbs all at once.
The ignition system provides the signal for firing the injectors by pulses of the ignition coil primary. Tony made the signal adjustments to work with the firing order of the InLine 6. Had to make a custom wire harness from injector plugs cannibalized from a Merc harness. Incorporated the air temp sensor in the support rail between the third and forth throttle body.
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