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 convenient 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 the user who has 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 in fuel testing laboratories.
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±8.5°C

Oil Pressure: 25-30 PSI

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

Power Supply: 380V 50Hz/60Hz; 220V 50Hz/60Hz 

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 professional and clear design of operating area makes the octane rating operation convenient and the data is easy to read and record.
Operating Panel
The auto-setting function of model FTC-M2 octane engine effectively simplifies operational procedures and improves the efficiency of octane testing.
Operating Panel
The operation panel is equipped with a protection system and the push-button switches to avoid misoperation.
Engine Speed and Running Time are displayed.
Ignition Timing is auto-set as per ASTM RON/MON specifications.
SINPAR Factory-calibrated Detonation Meter with the 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. Intake Air Temperature is AUTO-SET as per the conversion of RON & MON methods.
Research/Motor Method 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 (C.R.Digital Counter) is adjusted by the electric motor assembly.
Manual Emergency Stop protects machine.

Octane Engines Video
Combination Octane Rating Unit FTC-M

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 If IAT tuning is used to qualify the engine as fit-for-use, the temperature can be adjusted within ±22°C from the base temperature specified for the prevailing barometric pressure, and this temperature shall then be maintained within ±1°C when CR or KI results used for octane determination on each fuel are recorded.

See ASTM D2699 for details.

NOTE:*2 If intake MIXT tuning is used to qualify the engine as fit-for-use, the temperature can be adjusted between 141°C-163°C, and this temperature shall then be maintained within ±1°C when the CR or KI results used for octane determination on each fuel are recorded.     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

Dial Indicator & Digital Counter

Engine Speed Conversion

Dual-Speed Motor


Four-Bowl (with a cooling function)

Ignition Timing Display

Digital (Auto-Set)

Oil Pressure Display


Crankcase Oil Heater


Oil Temperature Display


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 octane engine speed to meet either Research Method (600 RPM) or Motor Method (900 RPM). No need to change the flywheel and V-belts.
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 Engine Crankcase is the heavy-duty cast-iron, box-type design with high strength and rigidity for running octane tests of various fuel types as well as long-lasting sealing system, that ensures long service life and carefree operation & maintenance.
Removable side doors allow to easily check the internal components for inspection, maintenance.
Engine Crankcase
Variable Compression Cylinder and Sleeve 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 fuel.
The Cylinder Height is expressed as the Compression Ratio Digital Counter Reading which is directly correlated to a specific octane value according to ASTM D2699 and ASTM D2700 methods specifications.
Variable Compression Cylinder and Sleeve Assembly
Cylinder Height
The Cylinder Height is adjusted by the Electric Motor assembly. It is the most convenient method for turning the worm shaft in either direction to raise or lower engine Cylinder Height (C. R. Digital Counter Reading).
The Cylinder Height
Standard Dial Indicator
The Dial Indicator is installed in Octane Engine for direct reference to Cylinder Height (Compression Ratio). Both Dial Indicator reading and C.R. Digital Counter reading are directly correlated to a specific octane value as per ASTM method specifications. It can improve the reliability and accuracy of octane test results.
Standard Dial Indicator
C.R. Digital Counter and Ignition Timing
They are directly displayed on the operating panel for easy reference and recording.
C.R. Digital Counter
There are two indicating counters to establish the differential between compensated reading and uncompensated reading according to barometric pressure.
Adjustable Spark Timing System
The Spark Timing System is a SINPAR factory set and it is adjusted automatically in accordance with ASTM D2699 RON& ASTM D2700 MON test methods. No manual adjustment is required.
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.
SINPAR Factory-Calibrated Detonation Meter
It converts changes in combustion knock to a stable and accurate analog signal. The 0 to 100 division analog indicating meter that displays the knock intensity signal from the analog detonation meter. Digital knock signal adjustment effectively improves octane test accuracy and test efficiency.
Knock Measurement Equipment
Four-Bowl Carburetor
The Four-Bowl Carburetor is available in multiple jet and venturi sizes for all applications. Fuel flow control system is used to permit adjustment of fuel-air ratio. The fuel level that produces maximum Knock Intensity 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 (option in Combination Octane Rating Unit FTC-M2 with SXCP) provides more sensitive fuel flow adjustment for obtaining more accurate result of fuel octane rating and delivers an efficient and accurate falling level test. This model allows determining maximum knock intensity without manual adjustment of fuel level. Operator can run accurate octane tests by PROCEDURE B in ASTM D2699 & ASTM D2700.
Four-Bowl Falling Level Carburetor
Safety System
The Safety System provides octane engine auto-stop with the fault indications, when any of follow conditions occurs on the Octane Rating Unit: abnormal oil pressure, abnormal cooling water pressure, abnormal high temperature of coolant, electrical power loss or electrical overload of the motor.
Safety Systems
Sensors Assemblies
All the sensors are connected to the control unit safely, reliably 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.
Armored Cables have great tensile strength and corrosion resistance for maximum service life.
The Sensors Assemblies
Exhaust Surge Tank System
Exhaust Surge Tank can eliminate resonance pulses and back pressure during the octane engine operation. Eliminating the interference of the variables makes the octane test results more consistent and accurate. Meanwhile, this system can effectively reduce noise and air pollution.
Know More
Exhaust Surge Tank System
Intake Air Humidity Control System
Intake Air Humidity Unit 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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