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About GTI

About GTI

The GTI Bi-Fuel System Altronic ® is an innovative technology that allows operators of large diesel engines substantially reduce operational costs as well as lower emissions. This happens as a result of substitution of diesel fuel by natural gas, of lower cost and waste produced in the combustion cleaner.


The Bi-Fuel ® System consists of patented technologies that allow safe operation of gas engines up to a maximum of 70% * of total fuel required.


Engines converted to GTI Bi-Fuel ® are performing as good as the diesel engines on factors such as efficiency, stability and load handling. An important feature of the Bi-Fuel ® is its ability to switch from one fuel to another without interruption in the operation of the engine.


The engine can be switched from one fuel to another manually or automatically, keeping your speed and load. This feature allows the user the flexibility to choose between natural gas and considering diesel price or availability of fuel, among other operational considerations.


Equally important feature of the Bi-Fuel ® is its ability to maintain levels of engine load when operating in gas mode within the limits of the engine. For operations above the programmed limit, the engine is automatically switched to 100% diesel mode, thus avoiding the need to lower the engine speed.


The optional Dynamic Gas Control (CDG) system incorporates fuel mapping as a function of the load and automatically adjusts the level of gas substitution to optimize performance at any load level. The Bi-Fuel ® uses an electronic control and monitoring system of last generation, which monitors critical engine parameters and the Bi-Fuel ® and turns the gas mode according to programmed limits. When a parameter exceeds the allowable limit, control passes to 100% diesel mode and interrupt the process electronically for diagnostic purposes. The control panel is located inside a NEMA rated for outdoor environments and is approved for Class 1, Division 2.

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Major Bi-Fuel System Components and Sub-Systems
Air/Fuel Mixer

The air-fuel mixer of the patented GTI Bi-Fuel System, located downstream of the gas power  valve, incorporates a fixed venturi design.This innovative mixer is installed such that all of the incoming air flows through the mixer.


For engines with multiple air intake systems,one mixer is at each of the intakes. The GTI Bi-Fuel  System uses mixing devices that do not incorporate any type of air throttle  plate in their design.


After exiting the mixing device, the air-gas mixture  enters the engine air-intake manifold, and distributes the charge to each  cylinder via the normal air distribution scheme of the engine.

Gas Power Valve


The gas power valve, located downstream of the gas pressure regulator, is a needle-type valve and is one of the adjustable components to the GTI Bi-Fuel System. This device is set during the tune-in phase of the engine conversion and sets the maximum gas flow rate to the engine.Once set, this valve remains in a fixed position regardless of engine load.


Note: For added flexibility on engines that operate over a wide spectrum of load levels, an optional, automatically actuated gas trim valve is substituted for the gas power valve


Gas Train

Conditioning and regulating the natural gas prior to admission into the engine is a critical part of the GTI Bi-Fuel System system. The system “gas train ”  includes a 20-micron fuel filter, a manual shutoff valve, an electrically operated solenoid valve actuated in the event of an emergency or for system shutdown, and a zero-pressure, demand-type gas pressure regulator.

This latter component reduces the inlet gas pressure (1–5 psi) to roughly atmospheric pressure. With a negative outlet pressure, the design allows the system to use a “demand ” control scheme whereby engine intake airflow determines the gas flow of the engine. As engine load changes, corresponding changes in intake air volume automatically draw additional fuel into the mixer.

Control Panel

The Control Panels are based on proven Altronic controllers and provide state-of-the-art engine control and safety shutdown monitoring. The system is designed specifically for GTI Bi-Fuel applications and is straight-forward and easy to operate. The panel monitors a number of pressure and temperature points and returns the engine to 100% diesel operation should any parameter deviate
from its normal range. In addition, an hourmeter function tracks the operating hours when in Bi-Fuel mode.

Alarms are annunciated in English-language messages (other languages can be programmed), and the controller maintains an
alarm log of the last 100 events.

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Operation and instalation

Operation and instalation

The GTI Bi-Fuel System provides gas to the  engine using a technique known as fumigation. In a process similar to that  utilized by carburetors found in spark engine applications, the system supplies  gas to the engine using the original air intake system. In the typical  configuration, the gas is introduced at a location upstream of the turbocharger and downstream of the engine air cleaner.


The gas is introduced at approximately atmospheric pressure using a proprietary air-fuel mixing device that allows for a high level of fuel atomization with the smallest possible air restriction After exiting the mixer, the fuel-air charge is compressed in the turbo and then distributed to each cylinder by the  engine air-intake manifold. The intake valves deliver the mixture to individual  cylinders at the proper moment according to the normal valve timing of the  engine. Upon entering the combustion chamber, the air-gas mix is compressed  during the compression stroke and ignited when the diesel injector is activated.


Because a majority of the fuel and air is already pre-mixed prior to activation of the injector, the combustion differs slightly from the normal "stratified charge" process of the diesel engine.


Peak cylinder pressures reached during bi-fuel operation, however, are within normal limits. Although natural gas has a lower energy density than diesel fuel, the lean-burn/excess air operation of the diesel engine com-bined with the compression provided by the turbocharger, allow the system to supply adequate quantities of natural gas to the combustion chamber, therefore assuring that the equivalent power can be realized.


All OEM engine specifications for injection timing, valve timing, compression ratio, etc., remain unchanged after installation of the Bi-Fuel System, and no engine modifications are required.


The included control system monitors various engine parameters (depending on engine size and application) such as manifold air pressure (boost pressure), exhaust gas temperature, intake manifold air temperature, inlet air restriction, supply gas pressure and engine vibration. This data allows the system (see inset) to determine when to activate  or deactivate bi-fuel operation depending on load level, ambient conditions, knock limits, low or high gas pressure or a detected malfunction in the engine.  The automatic default mode is always to 100% diesel operation.


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From crude oil pumping applications to water pumping in agricultural farms. Pumps are widely use in the day in day out work spam in
many different industrial. Pumping applications encompasses the industrial process of transport of liquids from one place to another; usually pumps are fed using fuel at higher prices. With the easy retro fit that  GTI Bi-Fuel provides, pumps can be operated on a dual Fuel mode taking the advantage of a less costly operation while maintaining the efficiency and characteristics of a 100% diesel

Pumping application are really common but not exclusive of the oil and gas industry, other active industries may include : Irrigation Uses:  Water transfer at fish farms, Pump out flood water, standby fire protection, water plants, waste water treatment plants to name a few.


Compression applications in the natural gas industry such as gas gathering, underground storage, gas processing, and
pipeline transmission.


Compressors are similar to pumps both increase the pressure on a fluid and both can transport the fluid through a pipe. As
gases are compressible, the compressor also reduces the volume of a gas. Liquids are relatively incompressible.


The same principle then applies to compressor with a GTI-BiFuel retrofit potential gains can be obtain from fuel cost
reductions to emissions reduction.


Compressors are engine driven rotating machines used to increase the pressure of natural gas there are a wide range of
applications for natural gas compressors. A common application is to boost the pressure of gas from low pressure wells so the wells can continue to produce as reservoir pressure declines. Compressors are used on gas transmission pipelines to maintain pressure and flow over long distances natural gas is compresses and store in underground caverns during the summer when production exceeds demand in the winter heating season compressors are used to move gas from storage to transmission lines.


Compressor are also used in oil production to help lift the oil to the surface injecting gas to the well reducing the density
of the oil, natural gas is normally produce along with crude oil but in many remote areas there is no infrastructure for getting the gas to market in the past much of this gas was simply flare to the atmosphere but increasing environmental pressure obligates to use this gas or compress the gas and re injected to the reservoir. GTI Bi-ful becomes very handy when allowing operator s to make use
of this gas in site. Some other compressor application include process application such refrigeration, fuel gas boosting for gas turbines and compress natural gas fuel stations for vehicles that run on natural gas.


Our world depends on reliable power for just about everything: for day-to-day living, for travel and leisure activities, for manufacturing and commerce, and for essential, life-saving services. Power Generation of any on–site application is an alternative to have an always
available source of power.


 Nonetheless, these sorts of power systems require copious amount of fuel to produce additional power when the public network is insufficient or a certain level of redundancy is wanted in critical processes or industries such as oil and gas, hospitals and airports.

Another important use of generators  is found on backup power for programmed maintenance of certain infrastructure also Providers of essential services like hospitals, data centers and public safety agencies rely on our emergency standby power systems to keep functioning during a power outage. Thus the importance of counting with a reliable and cost efficient solution to enhance the benefits of
self-power generation.


GTI Bi-Fuel makes power generation less costly and less contaminative by burning natural gas instead of 100% DIESEL.


Peak shaving is the ability to control your usage  from a supplier during intervals of high demand, in order to limit or reduce demand penalties for the  billing period For large industrial & commercial customers  who have usage levels that can vary  significantly, peak shaving can help you:


• Save money – by reducing the peak demand

penalty that your utility charges for times of

highest usage

• > 10%-30% demand cost savings possible –

depending on what type of loads and flexibility of

the loads, ie. Loads can be moved to another


• Peak shaving systems can pay for itself in less

than a year with large consumers, ie. > 5MVA


Hydraulic fracturing is the propagation of fractures in a rock layer caused by the presence of a pressurized fluid. fracking, is a technique used to release petroleum, natural gas (including shale gas, tight gas and coal seam gas or other substances for extraction. This type of fracturing creates fractures from a wellbore drilled into reservoir rock formations.


A hydraulic fracture is formed by pumping the fracturing fluid into the wellbore at a rate sufficient to increase pressure downhole to exceed that of the fracture gradient (pressure gradient) of the rock . Fracking equipment used in oil and natural gas fields usually consists of a slurry blender, one or more high-pressure, high-volume fracturing pumps (typically powerful triplex, or quintiplex pumps) and a monitoring unit.

Associated equipment includes fracturing tanks, one or more units for storage and handling of proppant, high-pressure treating iron, a chemical additive unit (used to accurately monitor chemical addition), low-pressure flexible hoses, and many gauges and meters for flow rate, fluid density, and treating pressure.

Fracturing equipment operates over a range of pressures and injection rates. This highly sophisticated pieces of equipment consumed large amount of fuel thus a conversion to Bi-fuel powered units utilizing GTI Bi-Fuel systems makes them much more cost efficient.


GTI Bi-Fuel on drilling rigs is one of the most popular an cost effective applications in the US. Operators have found extremely
attractive to outfitted several rental generators with Bi-Fuel® systems and put them to service in drilling rings.


These generators are operating on 60% well gas and 40% diesel in North Dakota for Zenergy for use as prime power so operators take the advantage of using their own resources and achieving massive savings. (See the video how to save a million dollars in the multimedia section.) This combination has allowed Zenergy to get their wells on line and producing while they wait for electricity.


Drilling rigs are machines which create holes in the ground. Drilling rigs can be massive structures housing equipment used to drill water wells, oil wells, or natural gas extraction wells, or they can be small enough to be moved manually by one person either way drilling rigs need a reliable source of power that is generally a Engine Generator Set powered on gasolina/disesel engine, along with a
mechanical transmission and generator for producing power for the drilling rig.


Generators produce all the power needed for such massive task that consumes lots of Energy so the same logic applies here when
turnings this get set to a dual fuel mode operation using GTI-Bi-Fuel.


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  • Does not require engine modifications
  • No loss of efficiency or power
  • Low cost / benefit and easy to install
  • Reduced operating costs
  • Increases uptime of generators and emergency engines
  • The combustion of natural gas reduces emissions through a cleaner burning.
  • Does not Requires supply of high pressure gas
  • Allows use of available gas or interruptible gas supply
  • State of art controll and monitoring
  • Reduce on-site storage requirements of diesel fuel.
  • Savings in operational costs of fuel through the use of natural gas can return to 100% diesel operation at any time.
  • Unique and patented design ensures no loss of efficiency or engine power.
  • Easy on site installation
  • Extends the stability and operation time of engines.
  • Converts industrial diesel engines to Bi-Fuel® operation by substituting up to 70% natural gas for diesel fuel
  • Rapid Return on Investment.Low cost and easy to install
  • Cleaner burning natural gas reduces exhaust emissions
  • Unique, patented design ensures no loss of power or efficiency

The savings realized by running  the GTI Bi-Fuel System is directly related to the cost of diesel fuel, cost of gas, and the number of hours of operation. The following is an example is a cost comparison between running a 1000 kW generator on 100% diesel and on Bi-Fuel with a 65% gas-to-diesel ratio in continuous operation. A number of assumptions are made in this example which are clearly stated in order to clarify the calculations.




Fuel consumption @ 1000 kW: 54 gph (100% diesel)
Hours per year 8000
Gas/Diesel ratio 65%
Diesel cost ($/gal) $3.50 per gallon
Natural gas cost ($/mcf) $11.00 per mcf
hhv of #2 diesel 140,000 btu/gal
hhv of natural gas 1,000 btu/scf
Gas Equivalent Gallon (GEG) 140 scf/gal



Diesel use per hour 54 gallons
Diesel cost per hour $189.00 (54 x $3.50)
Diesel cost per year $1,512,000 ($189 x 8000)



Diesel use per hour 18.9 gph (54 x 0.35)
Diesel cost per hour $66.15 (18.9 x $3.50)
Gas use per hour 4914 scf (54 x 0.65 x 140)
Gas cost per hour $54.05 (4914/1000 x $11.00)
Total fuel cost per hour $120.20 ($66.15 + $54.05)



Bi-Fuel Savings per Hour $68.80 ($189.00 -$120.20)
Bi-Fuel Savings per 8000 hours $550,368.00 ($68.90 x 8000)




The patented GTI Bi-Fuel System incorporates a sophisticated, electronic control system, which controls both natural gas and diesel fuel during operation. In addition, the GTI Electronic Control System (ECS) acts as an engine safety device, by monitoring up to 24 critical data channels including:


  • Exhaust Gas Temperature-Stack
  • Exhaust Gas Temperature-Cylinder
  • High engine manifold air pressure
  • Low natural gas supply pressure
  • High natural gas supply pressure
  • High engine vacuum


The various data channels are displayed on the ECS via an LCD display in either text or graphical format. The ECS notifies the user locally (via an LED general fault light) or remotely via modem, in the event of a fault.


If a fault is detected, the ECS will automatically switch the generator to 100% diesel operation and data-log the fault. The ECS fault set points are field adjustable and allow installation technicians to customize the Bi-Fuel System to the specific requirements of the customer and/or the operational limitations set-forth by the engine manufacturer. Once programmed, the fault settings are protected by a keypad lockout code, which prevents unauthorized personnel from altering the set points.


The ECS guarantees that in the unlikely event of either a Bi-Fuel System malfunction, or a disruption in natural gas supply pressure (either low or high pressure faults), the generator drive-engine will be protected from damage. Most of the monitored channels are latching type faults, i.e. if the Bi-Fuel System is deactivated by the ECS, the generator cannot be returned to Bi-Fuel operation until the ECS panel is manually reset. Lastly, the ECS also incorporates a built-in time delay function, which prevents initiation of Bi-Fuel operation after generator start-up, for a period of up to 300 seconds. This feature is used when the converted generator is used in paralleling operations, and allows the generator to start-up and synchronize on 100% diesel fuel before automatically switching to bi-fuel operation.



Installation of a Bi-Fuel System in no way compromises the performance of the generator relative to the rated load of the machine. A generator with a 1000 kW stand-by rating which has been retrofitted to the GTI Bi-Fuel System will still provide 1000 kW of power in both 100% diesel and bi-fuel modes. In other words, the generator is not de-rated after installation of the Bi-Fuel System. Similarly, there is no decrease in generator load response or stability while operating in either fuel mode.


After installation of the GTI Bi-Fuel System hardware, the generator is then operated under various load settings (normally with the use of a resistive load bank) while the System is checked and calibrated. After this "tune-in" process is completed, the generator is fully tested in bi-fuel mode to assure proper operation of the GTI Bi-Fuel System and generator during light, medium, heavy and transient loads. Finally, the generator is tested in 100% diesel mode to verify that its 100% diesel performance has not been effected by installation of the GTI Bi-Fuel System.


•Maintains diesel-like performance and efficiency

•Compression ignition

•Low gas supply pressure

•Sophisticated Altronic engine protection system

•Auto-switching of fuel modes

•Non-intrusive, simple installation

•Easy to opérate

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GTI projects

Petrobell Grantmining S.A.

 LOACATION: Field Tiguino Orellana - Ecuador


COMPANY: Petrobell Grantmining S.A.


POWER: 5x 450 kW


ENGINE: 3 x Caterpillar 3412


               2 x Caterpillar 3508




SOLUTION: GTI bi-fuel ® KIT: III-B26


TYPE OF GAS: Industrial Gas, 45% Methan


Petrobell, Ecuador since 2007 has been using the GTI Bi-Fuel sytem installed by FTC Energy Group SA in continuous operation in the field Tiguino located at 350 km from the small city of Francisco de Orellana  where the transportation DIESEL fuel is very difficult nor gas quality was optimal. Nonetheless they get a satisfactory substitution percentage 40%.

OCENSA Miraflores

 LOCATION: Station Miraflores, Boyaca. Colombia


COMPANY: Central of Colombia Pipeline OCENSA


TYPE OF GAS: Gas Industry, with 85% methane








SOLUTION: GTI-Bi-Fuel ® Kit Special Series


This pilot project was conducted to perform engineering studies and prefeasibility respective as a prelude to a macro project in 2012 to implement the GTI Bi-Fuel system at 14 pumping engines CAT 3612 CAT 3516 and three engines to generation. Projects that would be included by OCENSA as a CDM project Clean Development Mechanism, this project included ModBus communications with the control room

OXY Colombia



COMPANY OXY Occicental of Colombia


POWER 2 X 500kw






TYPE OF GAS Well Gas  with 50% methane


SOLUTION GTI Bi-Fuel ® Series II ki-C26


In 2009, OXY Occidental de Colombia had the need to generate 1MW of power in Caricare facilities. Diesel fuel transportation was very difficult and expensive. The company had an immediate need to start generating electricity and the ability to import a gas generator was remote and it would take 18 months. OXY took the option of converting their current generator fueled on DIESEL using the system Bi GTI Bi-Fuel they could achieved a bi-fuel operation with marvellous results.

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 Altronic operates a Quality Management System which complies with the requirements of ISO 9001:2008 for the following scope of
registration The Registration covers the Quality Management System for the design, manufacturing and assembly of electrical and electronic equipment for internal combustion engines and the design, manufacturing and assembly of industrial
instruments for measuring, display and control.


The ISO 9001:2008 is the basis of system quality management as it is an international standard that focuses on all elements of
quality management that a company needs to have an effective system that allows you to manage and improve the quality of your products or services.


ISO is a non-governmental organization that forms a bridge between the public and private sectors. On the one hand, many of its
member institutes are part of the governmental structure of their countries, or are mandated by their government. On the other hand, other members have their roots uniquely in the private sector, having been set up by national partnerships of industry associations.


Therefore, ISO enables a consensus to be reached on solutions that meet both the requirements of business and the  broader needs of society.


ALTRONIC operates an Environmental Management System which complies with the requirements of ISO 14001:2004 for the following scope of registration:

The Registration covers the Environmental Management System for the design, manufacturing and assembly of electrical and electronic equipment for internal combustion engines and the design, manufacturing and assembly of industrial instruments for measuring, display and control.


ISO 14001 is an internationally accepted standard that sets out how to implement an effective environmental management system (EMS). The standard is designed to manage the delicate balance between maintaining profitability and reducing environmental impact. the commitment of the entire organization allows to reach both.


Theimplementation of ISO 14001 environmental management system creates a systematic approach to environmental activities and improved business processes aimed at:


• Define the significant environmental aspectsand impacts for the organization.

• Stateobjectives and goals of environmental performance.

• Establish environmental management programs.

• Define the organization's environmental policy.

• Strengthen personal responsibility to the environment

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Frequently Asked Questions

FAQs Bi-Fuel
What does "Bi-Fuel" mean?

In simple terms, bi-fuel can be defined as the simultaneous combustion of two fuels. In the case of the GTI Bi-Fuel System, natural gas is utilized in conjunction with diesel fuel to operate the engine. After conversion, the engine is able 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.

Will my engine have to be modified to operate on the GTI Bi-Fuel System?

No. The GTI conversion technology has been  designed to allow for in-field retrofit of diesel engines without the need to change or modify the design of the engine. The GTI conversion hardware is mounted externally on the engine and does not require modification of the engine or alteration of any critical engine parameter.

Will the system affect my engine warranty?

Most OEM engine warranty programs do not  prohibit the use of aftermarket parts or Technologies. In brief, the policy of OEM's is that they neither recommend nor endorse aftermarket technologies;  however, the use of these products does not automatically void the validity of  the engine warranty. If the cause is unrelated to bi-fuel, the OEM's have historically honored the warranty and repaired the engine. Additionally, all GTI Bi-Fuel components that fail within the warranty period will be covered under the GTI Bi-Fuel warranty policy.

Why can't the engine use 100% natural gas?

Because of the very high ignition temperature of natural gas (approximately 1300 degrees Fahrenheit), sufficient heat is not generated during the diesel compression stroke to ignite 100%  natural gas. As such, dedicated gas engines employ spark plugs and an ignition system to facilitate combustion of the air-natural gas mixture. In contrast,  during bi-fuel operation, a reduced quantity of diesel fuel acts as the ignition source for the air-gas mixture; this process is often referred to as pilot ignition.

Will my engine lose power after conversion to the GTI Bi-Fuel System?

Under normal circumstances, engines  converted to GTI Bi-Fuel do not suffer any horsepower losses while operating in  bi-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. In some circumstances, the engine may be de-rated in bi-fuel mode due to shortcomings in gas supply composition and/or quality.

Will my engine run hotter on bi-fuel?

GTI Bi-Fuel technology has been designed to maintain OEM specifications for all engine temperatures including engine coolant emperature, oil temperature, exhaust gas temperature and intake air temperature. The Bi-Fuel System replaces diesel fuel normally consumed by the engine with an equivalent quantity of natural gas, relative to the heat value of each fuel. As such, engine air-fuel
ratios during bi-fuel operation remain largely an "equivalent gallon" of natural gas is consumed resulting in similar engine fuel efficiencies. Note: 1 gallon #2 diesel = 140 scf natural gas based on #2 diesel hhv.

What about efficiency?

The GTI Bi-Fuel System replaces diesel fuel with an equivalent quantity  of natural gas. This process results in the same net fuel burn vs. load as would  be experienced during 100% diesel operation. For each gallon of diesel fuel displaced during bi-fuel operation, there is a corresponding consumption of  approximately 140 cubic feet of pipeline quality natural gas (based on 129,000  btu/gallon # 2 diesel & 930 btu/scf natural gas). Thus, for each gallon of  diesel fuel displaced during bi-fuel operation, an "equivalent gallon" of  natural gas is consumed resulting in similar engine fuel efficiencies.

Note: 1 d of natural gas = I liter # 2 diesel.

What effect will the GTI Bi-Fuel System have on the durability of my engine?

Generally speaking, operation in bi-fuel mode has no negative effects on engine wear rates and durability. As explained above, because engine thermal loads are equivalent to 100% diesel operation, no excess wear of combustion chamber  components (pistons, rings, valves, injectors, etc.) occurs. In addition, many  users of the GTI Bi-Fuel System have reported positive benefits relative to
engine wear including extended oil change intervals and extended time between  overhauls. This is primarily the result of the cleaner burning characteristics  of natural gas compared to diesel fuel.

What are the economic benefits of operating on GTI Bi-Fuel?

Fuel cost savings resulting from operation in bi-fuel mode will vary according to the respective cost of each of the fuels. If there is a significant cost differential between the cost of diesel fuel (per gallon, liter, etc.) and the equivalent quantity of natural gas (heat value basis) in favor of the natural gas, significant fuel cost savings would result. The closer the fuels are in price, the lower the fuel cost savings will be during bi-fuel mode. In addition to fuel cost savings, engine maintenance savings (as explained above) may also
contribute to the economic benefit of bi-fuel operation.

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More of Our Content

Ivan Dario Caballero

Ing. Comercial Linea GTI-Bifuel

Ivan Dario Caballero Lozano

Ingeniero Comercial

Altronic - GTI

Phone: +57 (1) 7459090  ext. 105

Cell: 3006377559


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