Petrol Vehicle CNG Conversion System and it's modern and Oldest Technology ( Conventional & Sequential Injection). This is a money saving, environ friendly (Low emission) and easy conversion technology.Landi Renzo is a world leader of Vehicle CNG & LPG Conversion system technology provider.

1. “VEHICLE CNG CONVERSION TECHNOLOGY”
March 2, 2017 Prepared By: Engr. Mohammad Imam Hossain ( Rubel), Cell Phone: +8801814655360

2. • Navana CNG Limited, a sister concern of Navana Group is the leading CNG service
provider in Bangladesh. At present Navana CNG has around 1000 personnel in
various department and branches.
• Started it’s Journey on March, 2002.
• Now it has 8 CNG conversion workshops located at Dhaka, Chittagong, Bogra and
Sylhet.
• The company has a total of more than 1000 personnel.
• It has converted over 60,000 vehicles to CNG.
• It has sold and installed over 220 CNG Re-fueling Station at different places of
Bangladesh.
ABOUT NAVANA CNG LTD.

3. SOLE DISTRIBUTOR OF

4. LANDIRENZO IN THE WORLD
The company was established in 1954, For over 60 years Landi Renzo has been developing technology that transforms
the power of clean, compressed natural gas (CNG) into an alternative to gasoline and diesel fuel for transportation.
Landi Renzo is an environmentally-conscious global group that is engaged in the design and manufacture of systems
for CNG and LPG-driven vehicles. With over 30% market share, it is the world's number one company in alternative
automotive fuel systems and components.

5. WORLD MARKET SHARE
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
%ofMarketShare
Landi Renzo Tartarani Lovatto BRC EmmeGas LoGas Salustri Tomasetto
Achille
Others
Kit Brand
Market Share of Different CNG Kits

6. VEHICLE CNG CONVERSION TECHNOLOGY
NOW THERE ARE MAINLY TWO TYPES OF CNG CONVERSION TECHNOLOGY
AVAILABLE FOR THE PETROL VEHICLE CNG CONVERSION SYSTEM
1. CONVENTIONAL SYSTEM
2. MULTIPOINT SEQUENTIAL INJECTION SYSTEM

7. CONVENTIONAL SYSTEM
CONVENTIONAL TECHNOLOGY :

8. CONVENTIONAL CNG KITS SETUP

9. WIRING DIAGRAM

10. REGULATOR CN04
Technical Specifications:
Regulator type: 3 stages with electronic starting device and idling at
negative pressure
Use: automotive (suitable for vehicles with or without catalytic
converter, injection and carburetor)
Type of fuel: CNG (compressed natural gas)
Heating: Engine cooling circuit liquid
Test pressure: 300 bar
Inlet pressure: 220 bar
First stage adjustment pressure: 4 bar
Second stage adjustment pressure: 1.5 bar
Power supply: 12 V DC
High-pressure solenoid valve coil power capacity: 20W
Versions: CN 04: up to 100 kW
LANDIRENZO CNG REGULATOR CN04:
Electronic control device that reduces the pressure of CNG, allowing the regular flow of gas to
each request of the engine. It has three stages of reduction of pressure, which gives it stability in
both high as low pressure in the fueling, varying the amount of gas stored, and a coil of low
pressure in the output of the third stage. The absorption of heat collected from the engine
cooling fluid prevents the freezing during the fall of pressure. The flow of gas to idle is obtained
by main tube through the vacuum generated by the engine.

11. REGULATOR TN 1
LANDIRENZO CNG REGULATOR TN1:
Different capacity to assure right amount of gas supply depending on load &
speed. Electronic CNG level indicator & control.
Regulator type: 3 stages with electronic starting device and vacuum controlled
idling at negative pressure
Use: automotive (suitable for vehicles with catalytic converter, injection,
carburetor and turbo-charger)
Type of fuel: CNG (compressed natural gas)
Heating: engine cooling circuit liquid
Test pressure: 300 bar
Inlet pressure: 220 bar
First stage adjustment pressure: 4 bar
Second stage adjustment pressure: 1.5 bar
Power supply: 12 V DC
High-pressure solenoid valve coil power capacity: 20W
Idling solenoid valve coil power capacity: 14W
Versions:
TN 1/B (standard): up to 100 kW
TN 1 (oversize): from 100 kW to 146 kW
TN 2 C (super oversize): from 146 kW to 169 kW
TN 2 C/S: from 169 kW to 193 kW
TN 3 : over 193 kW
TN 1/B Turbo: for turbo-charger engines up to 154 kW

12. SELECTOR SWITCH:096M - 096M ECO
 An electronic control module whose main functions
are Gas/petrol selector with 2 positions led gauge
indicates the fuel being used; Petrol starting
automatically passing over to gas on deceleration with
overlapping; Display of the level of gas in the tank by
means of 5 led; Electronic safety device that cuts off
supply to the natural gas solenoid valves if the engine
stalls.
 Push button which is easy to operate.
 Easily programmable.
 Automatic switch over for EFI system while in gas.
SELECTOR SWITCH

13. SAFETY RELAY:
• It’s a cut off device for electronic signals
for injectors.
• Easy installation and fixing up.
• Reliable operation.
SAFETY RELAY

14. INJECTORS EMULATOR:
 During gas operation, these electronic devices
cut off the flow of petrol on cars equipped with
electronic injection and emulate the signal of the
injectors or other sensors. The emulator model
for each car varies depending on the type of
injection system involved in the conversion.
 Injection cut off device and Simulates
injectors operation.
 Emulators for almost all types of car.
EMULATOR

15. STAP (SPARK TIMING ADVANCE PROCESSOR):
 These devices change the engine spark advance when
running on natural gas and restore the original spark
advance every time you switch on to petrol supply. The
increase in spark advance during the higher octane gas
operation improves engine performance.
Different type of STAPs for different type of vehicles.
Strong control on Spark Timing.
STAP for Carburetor vehicles also.
STAP

16. AIR/FUEL MIXERS:
Mechanical devices that, by using the Venturi
principle, ensure correct air/fuel mixing in
both stationary and dynamic conditions. Each
mixer is designed for a specific vehicle in order,
together with the regulator, to optimize both
gas and petrol operation.
MIXER

17. START-PETROL SOLENOID VALVE:
This device positioned between the regulator gas
outlet and the mixer cuts off the flow of natural gas
during starting and petrol operation. Available in
normal and oversize version, both equipped with a
carburetion adjustment register
PETROL SOLENOID VALVE

18. HIGH PRESSURE PIPE:
• Designed to sustain up to 350 bar.
• Plastic coating for security from
external damage.
PIPE
LOW PRESSURE PIPE:
• Can sustain the high temperature
from engine.
• Steel fiber protection for more
security.

19. BREATHING HOSE:
• Hose use for ventilation of any
unexpected leakage of gas.
• Extra protection for high
pressure pipe.
BREATHING HOSE

20. MULTIPOINT SEQUENTIAL INJECTION SYSTEM
EVO GAS: Landi Renzo EVO GAS is an injection system that combines performance and easy
installation. The mono-connector electronic control unit and the new GIRS 12 rail allow a simple
calibration focusing on essential quality.

21. REGULATOR NG1-2
REGULATOR NG1-2:
This is a compensated, one-stage diaphragm type regulator, with water-gas heat exchanger, filter, high-
pressure gas solenoid valve and safety valve. It is calibrated for a supply pressure that is 2 bar (200 kPa) above
the pressure of the intake manifold. The maximum flow rate is 22 Kg./h.
These regulators can be provided with linear electronic sensor.
TECHNICAL SPECIFICATIONS
Weight: 1670 g
Rated operating capacity: 22 kg / h
Operating temperature: -20 ÷ 120 ° C
Pressure calibration of safety valve: 3 bar (300 kPa)
Working pressure: 2 bar (200 kPa)
Electrical characteristics of the coil: EV 12 V 20 W
Certification: E 13-110R-000098

22. REGULATOR NG2-2
REGULATOR NG2-2:
The NG2-2 is a reducer of two stages of membrane with a vacuum compensation. The absorption of heat,
collected from cooling liquid of the engine, prevents the fall of internal pressure and the freezing of CNG. It
has a gas electro valve with filter and internal security valve. It is calibrated to output a pressure of 2 bar (200
kPa) higher than the pressure in the collector of admission.
TECHNICAL SPECIFICATIONS
Weight: 2250 g
Rated operating capacity: 40 kg / h
Operating temperature: -20 ÷ 120 ° C
Calibrated pressure of the safety valve: 8 bar (800 kPa)
Aspired work pressure of 2 bar (200 kPa)
Electrical characteristics of the coil: EV 12 V 20 W
Certification: E 4-110R-000022

23. REGULATOR NG2-2.5 TURBO
REGULATOR NG2-2.5 Turbo:
The NG2-2, 5 is a reduction of two stages of membrane with a vacuum compensation. The absorption of
heat, collected from cooling liquid of the engine, prevents the fall of internal pressure and the freezing of
CNG. It has gas electro valve with filter and internal security valve. It Is calibrated to output a pressure of 2.5
bar (250 kPa) higher than the pressure in the collector of admission.
TECHNICAL SPECIFICATIONS
Weight: 2250 g
Rated operating capacity: 40 kg / h
Operating temperature: -20 ÷ 120 ° C
Calibrated pressure of the safety valve: 8 bar (800 kPa)
Aspired Work Pressure of: 2.5 bar (200 kPa)
Electrical characteristics of the coil: EV 12 V 20 W
Certification: E 4-110R-000022

24. ECU
ELECTRONIC CONTROL UNIT(ECU):
The control and drive of the system is affected by the EVO gas
Electronic Control Unit (ECU) which is therefore considered the
"brains" of the system.
It takes a trigger signal from the Petrol ECU and diverts this signal
to the gas injectors via a series of calculations (in order to deliver
the correct amount of gas).
It relies on a series of inputs from the engine for these
calculations. (Water Temperature, Gas Temperature, Gas
Pressure, engine RPM and many others).
The new Landi Renzo EVO ECU approved for Euro and Euro 5
applications. Summaries the concept of absolute quality .
The strengths of this new control unit are the reliability and
precision of the self-calibrating features, which facilitate quick and
successful vehicle calibration. The fact that the mapping can be
adjusted and the integration with petrol, if required, are however
maintained .
With Landi Renzo EVO, it is also possible to diagnose the petrol
injector connections and functioning of individual gas injectors .

25. INJECTOR RAIL
INJECTOR RAIL :
 The Landi Renzo gas injectors are the best in the world. The EVO- A
injector rail combines the techniques of high-end injection rails with
exceptional resistance to gas impurities, which means a gas filter is no
longer strictly needed.
 They are a "side-fed" injector which reduces, substantially, the
possibility of blockage and failure by contaminated gas.
 High-performances injectors
 Compact dimensions: easier to install
 Noiseless and resistant injector rail
 Higher level of sealing through the IP6K9K connector
 Available in 4 sizes to be adapted to all engines
 2, 3, 4 cylinders versions
 Fuel rails are designed to include pressure and temperature sensors
that enable precise fuel metering under the broadest range of
operating conditions.
 Natural gas flow mass is metered by the electronic fuel injectors
according to the processed signals from either the engine or AFCM
controller
 A strong and robust electric motor, which gives the injector its
distinctive clicking sound, is triggered by the Gas ECU allowing a
controlled amount of Gas to enter the engine at the correct time. The
injectors can deliver enough gas to "feed" 40KW's per cylinder.

26. GAS FILTER
GAS FILTER:
 Natural gas is gathered from a pipeline and
travels to a connecting compressor station
which elevates its pressure to a range from
2000 psi to 5000 psi before finally being
ready for use in natural gas vehicles
 Contaminants can enter into the gas at any
stage of this processing
 In addition to stationary filtration, on-board
filtration is critical to ensure clean gas is
available as a final product at the engine
injectors
 This is located between the regulator and
the injector rail and has the function of
filtering the NATURAL GAS in the gas phase.
The filter contains a 10 μm cartridge.

27. MAP SENSOR
MAP SENSOR
The MAP sensor detects the pressure inside
the intake manifold for the correct functioning
of the gas control unit.

28. INDICATOR SWITCH
INDICATOR SWITCH :
Electronic control module with the following functions:
 Gas/petrol switch and monitoring of the current fuel in use
by means of two LEDs.
 Monitoring of gas fuel level tank by means of 5 LEDs.
 The switch is also equipped with an acoustic signal (buzzer)
which sounds when the system reverts to petrol mode either
due to low pressure or when an error is detected.

29. BENEFITS OF SEQUENTIAL SYSTEM
BENEFITS OF EVO GAS:
 EVO GAS is the most up-to-date CNG conversion technology
 Compatible with the most stringent emission standards (Euro 4 and Euro 5)
 Possible gas integration with petrol
 Computerized Efficient self-calibration facility
 More fuel efficient
 Injector rails with high resistance to gas impurities
 Range of optimized regulators based on power output
 Remote assistance for ECU calibration
 System diagnostics efficient self-calibration
 No more manual tuning problem
 Best solution for latest model vehicle
 Easy to install & Separate Gas ECU
 Direct gas injection like petrol
 Auto switching facility between gas and petrol
 Vehicle diagnosis facility
 Less maintenance cost
 Maximum power output and efficiency

30. CYLINDERS are..
• Seamless.
• All tested.
• 5 years warranty.
CYLINDER
`PARAMETER DESCRIPTION
Material Steel Alloy ( 34 Cr Mo 4)
Standard NZS 5454 / ISO11439
Water capacity 22 WL, 30 WL, 40 WL, 50 WL, 60 WL,
90 WL, 112 WL, 100 WL, 120 WL
Working pressure 200 -220 Bar ( equivalent to 2900
PSI to 3300 PSI)
Test Pressure 350 Bar ( equivalent to 4500 PSI)
Burst Test Pressure 450 Bar ( equivalent to 6615 PSI)
Minimum wall
thick ness
6.5 mm to 7 mm
CNG CYLINDER MANUFACTURER DATA
REPORT:

31. CYLINDER
Specification

32. CNG CYLINDER VALVES:
• Burst disk unit
• Excess flow limiter
• Fusible plug
VALVE

33. •Cut off solenoid valve
•Double stage solenoid valve
•1 mm distance between the stages
•2.5 mm distance on the top
•10 watt absorption
•12 or 24 volt available
•Amp water proved connection
•Manometer port available
•m12 or ¼” threads available
•Filter
•Burst disk unit
•Excess flow limiter
•Fusible plug
VALVE
CNG CYLINDER VALVES

34. BENEFITS OF CNG
 For having higher octane rating, CNG minimizes the knocking tendency and
detonation of the engine.
 Again as a gaseous and clean fuel it perfectly mixes up with air and get burnt inside
the engine without keeping residual HC, which results no soot particle in the
lubricating oil and increase the life of lubricating oil.
 CNG driven vehicle takes minimum maintenance cost.
 CNG is cheaper than any other fuel, it saves more than 80% fuel cost.

35. MONEY SAVINGS
Saving calculator:
Taka saving per year =
Where,
A = Cost of per Lt. Petrol/Octane (in Tk..)
B = Cost of per m³ CNG (in Tk.)
X = Per day traveled distance (in km.)
Y = Rate of petrol/ Octane consumption ( in km/Lt.).
365
Y
BX
Y
AX








36. PAYBACK PERIOD
REGULAR/CONVENTIONAL PACKAGE:
For Example Assume
Per day run of your Vehicle X=200Km
Rate of fuel consumption Y=8 Km/Lt
Cost of Octane /Lt A= TK 99
Cost of CNG/m3 B=TK 30
So, Your saving per Year for using CNG = (99X200/8-30X200/8)X 365 =TK 6,29,625
Pay Back Period:
Total cost of Conversion for the mentioned vehicle is TK 66,100 , So the payback period in
month will be follows
( 66100/629625X12)=1.25= 1 month
Note: Theoretically 1 m3 CNG=1.23 lit. of petrol/octane. Practically, vehicle will run the
same distance as it goes with 1 lit. of petrol/octane. But it depends on the engine
condition of your vehicle.

37. PAYBACK PERIOD
SEQUENTIAL INJECTION/ EVO GAS PACKAGE:
Practically fuel saving of EVO Gas is almost 40% more than conventional Conversion.
For Example Assume
Per day run of your Vehicle X=200Km
Rate of fuel consumption Y=8 Km/Lt
Cost of Octane /Lt A= TK 99
Cost of CNG/m3 B=TK 30
So saving per Year for using CNG = (AX/Y-BX/YX.40)X365
(99X200/8-30X200/8X .40)X 365 =TK 7,93,875
Pay Back Period:
Total cost of Conversion for the mentioned vehicle is TK 98,900 , So the payback period in
month will be follows
( 98900/793875X12)=1.49 month = 1 Months , 15 Days
Note: Theoretically 1 m3 CNG=1.23 lit. of petrol/octane. Practically, vehicle will run the same
distance as it goes with 1 lit. of petrol/octane. But it depends on the engine condition of
your vehicle.

38. • 15 months or 30,000 km of running after conversion free service
warranty; whichever is earlier and covers free services & repairs
related to conversion systems.
• 5 years warranty for CNG cylinder.
GUARANTY & WARRANTY
Warranty

39. WHY NAVANA CNG???
 Trained engineers and technicians are engaged in CNG conversion.
 Availability of spare parts is guaranteed.
 We ensure timely delivery of converted vehicles.
 Bank Loan facilities.
 One point financial dealings is possible.
 Back up service facilities in seven places in the country named Dhaka-Tejgoan, Dhaka-
Uttara, Dhaka-Mirpur, Dhaka-Paltan, Chittagong, Sylhet & Bogra.
 Time to time up gradation of technology and presenting to customer is an added
advantage.
 Govt. approved CNG conversion workshop.
 We are member of the Bangladesh CNG Filling Station and Conversion Workshop
Owners Association of Bangladesh.
 We have several Landi Renzo, Italy certified Technicians & Engineers.
 We are using torque wrench to tighten cylinder shut-off valve. Without it, appropriate
valve tightening is not possible.

40. WHY NAVANA CNG???
 We have Cylinder Retesting Facility.
 Other projects & facilities
 Stationery diesel Engine conversion to CNG
 Automotive diesel Engine conversion to CNG

41. ANY QUESTIONS ????

42. Thank You