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Created: 10 Nov 2001
Updated: 24 April 2002
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What are 'engine codes'?
Every engine in the GM range (i.e. includes Vauxhall, Opel etc.) has a engine code which represents the type of engine, its fueling type and its cubic capacity (cc in litres).
So what is the code system?
Each engine code usually begins with a letter, followed by 2 numbers and then either 2 or 3 letters after that. Lets take the following example:-
This is the engine code for the 2L 16v, DOHC, fuel injection engine as found in the Calibra, Astra and Cavalier cars. Lets split the engine code up. The letter 'C' is the type of exhaust or emission level standard. In this case C = EEC R 83.
The next 2 numbers is the engine cc, which is 2000cc (i.e. 2L). The next letter (X) is the engine compression ratio, in this case X = 10.0 to 11.5. The letter E is the fueling system, which E = multi-point fuel injection (petrol).
Where do I find the engine code?
The engine code shall be stamped below the cylinder head (up to 1993), usually on a small flat surface. But after 1993 the location moved to the edge of the cylinder block, transmission side.
|Engine Code System:|
The engine code system takes the following standard (Petrol engines):-
ie C20LET is a 2L Turbo injection engine with a CAT and a compression ratio of 8.5 to 9.0.
The engine code system takes the following standard (Diesel engines):-
ie 23DTR is a 2.3L Turbo diesel engine with increased output.
Exhaust Emission Unit
Engine Size (cc)
|C||EC 91/441/EEC, US ' 83||Two digit number represents the litre of the engine size, i.e. 20 is 2.0L and 35 is 3.5L. So engine size in litres x 10.|
|X||EC 91/441/EEC, stage 2#|
|none||ECE R 83 A (as R 15.04)|
|*||ECE R 83 A (as R 15.04)|
|G||<= 8.5||E||Multi-point Fuel Injection|
|L||> 8.5 to 9.0||Z||Central Injection|
|N||> 9.0 to 9.5||D||Diesel|
|S||> 9.5 to 10.0||V||Carburettor|
|X||> 10.0 to 11.5|
Specific Version (if quoted)
|Code X||Fuel system|
Corp. Ignition System
|F||Vehicles for Authorities|
|2||Family II engine|
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