Shanghai Sinpar Scientific Instrument Co.,Ltd.

Combination Octane Rating Unit FTC-M2

The Complete Solution For Octane Testing
Combination Octane Rating Unit FTC-M
  • The Complete Solution For Octane Testing
  • The Complete Solution For Octane Testing
  • The Complete Solution For Octane Testing
Combination (Research and Motor Method) Octane Rating Unit FTC-M2 is used as a complete system for determining octane number of motor fuels, conforming to ASTM D2699 (ISO 5164) and ASTM D2700 (ISO 5163) Standard Test Methods.

The Combination Octane Rating Unit FTC-M2 provides the quick conversion between Research Method (RON) and Motor Method (MON). With either method, testing capabilities cover the 40-120 octane number range.


ASTM D2699 (Research Method), ASTM D2700 (Motor Method);
ISO 5164 (Research Method), ISO 5163 (Motor Method);
IP 237 (Research Method), IP 236 (Motor Method)


SINPAR FTC-M2 Octane Engine applies to users who have the requirements of wide source test samples, large test quantity, long continuous test time, performing to ASTM standard test procedures.
With excellent test accuracy and stable performance, it is widely accepted and used by fuel testing labs.
Operating Conditions:
Operating Conditions
Combination Research Method and Motor Method Octane Rating Unit FTC-M2 produces octane test results under these standard operating conditions:

Research Method (ASTM D2699)

Motor Method (ASTM D2700)

Engine Speed: 600 RPM +/- 1%

Engine Speed: 900 RPM +/- 1%

Spark Timing: 13° BTDC

Spark Timing: Variable Based on Cylinder Height

Intake Air Temperature: 52°C±1°C

Mixture Temperature: 149°C±1°C

Jacket Temperature: 100°C±1.5°C

Oil Temperature: 57°C±8.0°C

Oil Pressure: 25-30 PSI

Intake Humidity: 25-50 grains of moisture/lb. of dry air

Power Supply: 380V/440V 50Hz/60Hz, 3Ph 

Operation Panel:
Operating Panel
Parameters are adjustable via operation panel according to ASTM D2699 (RON) and ASTM D2700 (MON) test method specifications.
Operating Panel
The operating area is clearly designed for simple operation of octane rating. The data is easy to read and record.
Operating Panel
A number of one-button auto-setting functions on the panel simplify the test procedure and improve the testing efficiency. .
Operating Panel
The panel features an E-STOP button, fault indicator and the anti-misoperation pushbuttons for added safety and security.
Engine Speed and Running Time are displayed.
Ignition Timing is auto-set as per ASTM RON/MON specifications.
Detonation Meter with digital adjustment produces stable and accurate K.I. readings.
Oil Pressure is displayed with failure indication for checking lubrication system status.
Temperature Control with high precision of ±0.5°C. Air Temperature is AUTO-SET as per RON/MON methods.
RON/MON Conversion: Just select the engine speed to meet either RON Method(600 RPM) or MON Method(900 RPM).
Safety System provides octane engine auto-stop with the fault indications.
The Cylinder Height is adjusted and controlled by a dedicated motor driving assembly.
Emergency-Stop protects the engine unit.

Basic Information



Working Range

40-120 octane number

Operation Conditions

Engine Speed (Motor)

900±9 rpm

Engine Speed (Research)

600±6 rpm

Ignition Timing (Motor)

Variable as Cylinder Height (C.R.) is Changed

(Basic Setting 26° at 5:1 C.R.)

Ignition Timing (Research)

13° BTDC

Intake Air Temperature (Motor)


Intake Air Temperature (Research)*1

52±1°C at Std. Barometric Pressure,
Depends on barometric pressure

Intake Mixture Temperature (Motor)*2


Cylinder Jacket Coolant Temperature


Crankcase Oil Temperature


NOTE:*1 See ASTM D2699 for details.

NOTE:*2 See ASTM D2700 for details.

Engine Information

Compression Ratio (C.R.)


Cylinder Bore (Diameter)

82.55 mm (Standard)


114.30 mm

Carburetor Venturi (Research)

14.30 mm

Intake Valve Clearance (Hot)

0.20 mm±0.025 mm

Exhaust Valve Clearance (Hot)

0.20 mm±0.025 mm

Intake Valve Opens Timing

10°±2.5° ATDC

Intake Valve Closes Timing

34° ABDC

Exhaust Valve Opens Timing

40° BBDC

Exhaust Valve Closes Timing

15°±2.5° ATDC

Crankcase Oil Pressure

172 kPa - 207 kPa

Function Information

Compression Ratio Adjustment


Compression Ratio Display Device

Dual-Indicator & Digital Counter

Engine Speed Conversion

Dual-Speed Motor


Four-Bowl (with a cooling function)

Ignition Timing Display

Digital (Auto-Set)

Oil Pressure Control


Crankcase Oil Heater


Water Pressure Control


Air Humidity Control System


Unit Safety System


Research/Motor Method Conversion
The Conversion is easily accomplished by the use of Dual-Speed Motor provided with the Combination Octane Rating Unit. Switch the engine speed to meet either Research Method (600 RPM) or Motor Method (900 RPM).
Research/Motor Method Conversion
Synchronous and Dual-Speed Motor
The Dual-Speed Motor mounted on Slide Base steadily provides constant octane engine speed as per ASTM D2699 and ASTM D2700 standard test methods during the octane rating operation.
Synchronous and Dual-Speed Motor
Engine Crankcase
The heavy-duty cast iron box design crankcase offers high strength and rigidity for octane testing of various fuels, and its long-lasting sealing system ensures long service life, trouble-free operation and maintenance. Removable side doors allow for easy inspection, maintenance and access to internal components.
Engine Crankcase
Variable Compression Cylinder Assembly
The Cylinder Assembly allows the Compression Ratio to be changed by adjusting Cylinder Height during octane rating operation. The available range of Compression Ratio is 4:1 to 18:1, which allows testing a wide range of fuels.
The Cylinder Height Digital Counter Reading is directly correlated to a specific octane value according to ASTM D2699 and ASTM D2700 specifications.
Variable Compression Cylinder and Sleeve Assembly
Motorized Compression Ratio Changer
Cylinder Height adjustment is realized by a motor driving assembly. A high-precision sensor is mounted to accurately measure the cylinder height value. The measuring system is stable, not affected by engine temperature and vibration.
The Cylinder Height
Standard Dial Indicator
The Dial Indicator is installed in Octane Engine for direct reference to Cylinder Height. Both Dial Indicator reading and C.R. Digital Counter reading are directly correlated to a specific octane value as per ASTM methods specifications.
Standard Dial Indicator
C.R. Digital Counter and Ignition Timing
They are directly displayed on the panel for easy reference and record.
C.R. Digital Counter
There are two indicating counters to establish the difference between compensated and uncompensated readings based on barometric pressure.
Auto-Set Spark Timing System
The Spark Timing System is a precise laser-sensed positioning & timing system with automatic setting function that complies with ASTM MON & RON test methods.
C.R. Digital Counter and Ignition Timing
Knock Measurement Equipment
The Knock Measurement Equipment is cabinet-mounted in octane unit panel and connected to knock pickup assembly mounted directly in the cylinder's combustion chamber.
Digital Detonation Meter
It converts changes in combustion knock to a stable and accurate analog signal. Digital signal adjustment improves octane test accuracy and efficiency.
Knock Measurement Equipment
Four-Bowl Carburetor
The Four-Bowl Carburetor is available in multiple jet and venturi sizes for all applications. The fuel level that produces maximum K.I. is from 0.7 in. to 1.7 in.
Carburetor Cooling System
The carburetor is equipped with a cooling system connected with the intake air control unit.
Falling Level Model
Falling Level Carburetor (applicable in SXCP Octane Rating System) with sensitive fuel flow adjustment delivers an accurate falling level test. This mode allows determining maximum K.I. without manual adjustment of fuel level. Operators can run accurate octane tests by PROCEDURE B in ASTM D2699 & ASTM D2700.
Four-Bowl Falling Level Carburetor
Safety System
The Safety System provides engine auto-stop with the fault indications, when any of follow conditions occurs on Octane Rating Unit: abnormal oil pressure, abnormal water pressure and coolant temperature, electrical power loss or overload.
Safety Systems
Sensors Assemblies
All the sensors are connected to the control unit safely and conveniently through waterproof aviation connectors.
The connection panel is clearly labeled for each sensor. It's very ease for operator to perform the maintenance and replacement.
The armored Cables are used for maximum service life.
The Sensors Assemblies
Water-Cooled Exhaust Surge Tank System
The system can eliminate resonance pulses and back pressure during octane rating operation. Eliminating the interference of the variables makes octane test results more consistent and accurate. Meanwhile, this system can effectively reduce noise and air pollution.
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Exhaust Surge Tank System
Engine Air Humidity Control System
The Engine Air Control System with a adjustable refrigeration system is supplied to regulate the moisture content of intake air into octane engine at a constant 25-50 grains of moisture prescribed of dry air as specified by ASTM D2699 and ASTM D2700 methods.
Know More
Intake Air Humidity Control Unit
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