GB/T 38184-2019 English PDF (GBT38184-2019)

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GB/T 38184-2019: Road vehicles -- Spark plug heat rating classification and test method
GB/T 38184-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.50
T 37
Road vehicles - Spark plug heat rating classification
and test method
(ISO/TR 15409:2002, Road vehicles - Heat rating of spark plugs, NEQ)
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Heat rating method and classification ... 5 
Annex A (informative) Conversion between boost pressure and IMEP value .. 9 
Road vehicles - Spark plug heat rating classification
and test method
1 Scope
This Standard specifies spark plug heat rating classification and test method of
ignition engines of M, N, L road vehicles.
This Standard is applicable to ignition engine spark plug.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 6791, Road vehicles - Spark-plugs and their cylinder head housing -
Basic characteristics and dimensions (GB/T 6791-2012, ISO 28741:2009,
MOD)
SAE J2203, SAE17.6 Cubic Inch Spark Plug Rating Engine
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 heat rating
On the special heat rating machine, according to the specific working conditions,
measure the thermal characteristics of spark plug.
3.2 heat rating value
The result of heat rating that is expressed by the indicated mean effective
pressure (IMEP).
NOTE: The unit is kPa or psi.
3.3 heat rating classification
Classify the heat rating value according to intervals. Use specific Arabic
- Fuel injection timing: cut off the fuel injection after the top dead center of
the intake stroke (60±5)°;
- Fuel flow rate: (2±1) L/min;
- Fuel injection pump: the fuel injection pump has a return hole pressure of
(100±10) kPa, or a suitable EFI system;
- Fuel injection pressure: the minimum shall be 5170kPa. If using an EFI
system, the fuel pressure needs to ensure adequate fuel supply and
atomization;
- Mixing gas concentration: the mixing gas concentration when the hot plug
temperature reaches the highest value;
- Intake air temperature: (107±3)°C;
- Intake humidity: per 0.453kg of dry air contains (0.0048±0.0016)kg of water;
- Coolant: choose the appropriate coolant that shall have good anti-fouling
function;
- Water jacket inlet water temperature:
● (107±3) °C when it is with pressure fan cooling control;
● (88±1)°C when it is with embedded cylinder head engine;
- Coolant flow rate: (20±2)L/min;
- Crankcase engine oil: SAE60 or equivalent additive-free aircraft oil;
- Engine oil pressure:
● (650±40)kPa at the main bearing;
● over 100kPa at the valve device;
- Engine oil temperature: (88±5)°C;
- Engine oil quantity: the engine oil level is located in the middle of the oil
sight glass.
4.2 Heat rating
4.2.1 The pressure point of pre-ignition occurs is obtained by the following steps:
a) The boost pressure is gradually increased in an increment of 13.5kPa (4
inHg) till the pre-ignition occurs. It can be indicated by a rapid rise in the