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The GTI Bi-Fuel System enables operators of heavy-duty diesel engines to substantially reduce operating costs and lower emissions by running dual fuel. Add lower cost, cleaner-burning natural gas or propane to your fuel source mix without engine modification or voiding your factory warranty.
 The GTI Bi-Fuel System operates by blending diesel fuel and natural gas or propane in the combustion chamber. This is achieved using a pilot-ignition, fumigated gas-charge design, where by natural gas is pre-mixed with engine intake-air and delivered to the combustion chamber via the air-intake valve. The air-gas mixture is ignited when the diesel injector sprays a reduced quantity of diesel fuel into the chamber. This diesel “pilot” acts as the ignition source for the primary air-gas combustible.
A key feature of the Bi-Fuel System is its ability to switch fuel modes without interruption in engine power output. The engine can be switched between diesel and gas automatically while maintaining speed and load. This feature gives the user the flexibility to choose between gas and diesel modes as dictated by fuel pricing, fuel availability or other operational considerations.
An equally important feature of the Bi-Fuel System is its ability to maintain engine power levels while operating in gas mode between the “continuous” and “prime” ratings of the engine. For operations above the programmed power limit, the engine is automatically switched to 100% diesel mode, thus avoiding the necessity to de-rate the engine. In applications where the load varies substantially, the optional Dynamic Gas Control (DGC) version of the system provides for adjustment of the gas substitution rate according to a map of fuel vs. load.
The various components of the Bi-Fuel System are installed externally of the engine, and at no time is the engine disassembled during installation. Because the OEM air-intake and diesel injection systems are utilized by the Bi-Fuel System, no engine modifications are required for installation.
All OEM engine specifications for injection timing, valve timing, compression ratio, etc., remain unchanged after installation of the Bi-Fuel System. The Bi-Fuel System requires a low pressure natural gas supply (approximately 2-3 psi) with a flow rate of approximately 8 scfh/kW=5,000 scfh).
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