Frequenty Asked Questions (FAQs)


What does Dual-Fuel mean?
In simple terms Duel-Fuel can be defined as the simultaneous combination of two fuels. In the case Rapid Dual-Fuel system, natural gas is utilized in conjunction with diesel fuel to operate on either 100% diesel fuel, or alternately, on a mixture of diesel fuel and natural gas (or other methane based fuels). At no time is the engine able to operate on natural gas exclusively.

How much diesel is substituted?
Targeted substitution of diesel fuel is 80% and, in practice, the highest ratio achieved has been 92:08. Actual rate of substitution is affected by a variety of factors such as condition of generator, ambient pressure and temperature, load, engine speed, BEMP and fuel injection timing. Under light load, or in application requiring excessive idle time, there will be a substitution rate penalty. On generators operating on a steady state load shall exhibit a much higher ratio of diesel replacement for planning purpose however; it is recommended that all calculation be based on a conservative ratio of 70:30.

Do you alter my engine completely?
It must be understood that finished product is still a diesel cycle (compression ignition) engine. There is no modification to the original diesel engine and our kit does not require changing the compression ratio. There is also no change required to the cooling exhaust system. The Rapid Dual Fuel system does not alter the diesel engine in any manner whatsoever and the generator can operate on full diesel fuel if required, even with the kit installation.

How can this help environment?
Utilizing Dual-Fuel technology, base diesel emission levels for NO x and particulates are reduced. The stack exhaust is made cleaner and here is visible reduction of smoke from the exhaust. Internally, the engine oil runs cleaner, the filters last longer and the oil change interval can be revised upwards.

How about the economics?
In countries where piped gas is cheap compared to diesel fuel, the financial benefits of substituting diesel fuel with natural gas provide a very attractive option. When there is considerable cost difference between natural gas and diesel, it provides for a short payback period. Gas engine generators cost considerably more than a diesel engine fitted with a Dual-Fuel generator enables greater operational freedom because, if, for some reason, the gas supply is affected, a dual fuel engine can still be operated on diesel fuel without loss of production.

Will the extra power damage my engine?
No. In order to maximize all of the benefits of this system, the engine must be in good condition (this applies for any performance or economy modification). Since the engine is burning the entire amount of diesel injected, the engine will now run cleaner with no soot build-up in the combustion chambers. This means the engine oil stay cleaner for longer, therefore doing a better job and extending engine life.

What if there is a malfunction in the system?
If there is a fault in the system (e.g. the alternator fails and no longer sends an engine speed signal) the system shuts itself down, preventing any gas flow. This is a safety measure to prevent over fuelling. The engine will still run normally on diesel only.

Will my engine lose power after conversion to Dual-Fuel?
Under normal circumstances, engines converted to RES Dual-Fuel do not suffer any horsepower losses while operating in Dual-Fuel mode. Because the system maintains OEM compression ratio values and does not incorporate an air-throttling device, peak horsepower and efficiency levels of the converted engine remain on par with 100% diesel operation.

Does diesel gas work with biodiesel?
Yes, if the engine runs properly on biodiesel, it will certainly handle Diesel Gas system, delivering the same results (and will be even cheaper to run, due to the cost of biodiesel). Emissions are dramatically improved again as well.

For further questions, please feel free to drop your query at info@rapid-eng.com

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