Buenas

Os dejo la información en inglés que es más fácil de comprender
http://www.topbuzz1.carenthusiasts.co.uk

Engine Code System:

Codificación
ABBCDE
Ejemplo: C20LET is a 2L Turbo injection engine with a CAT and a compression ratio of 8.5 to 9.0.

Codificación diesel
BBDEE
Ejemplo: 23DTR is a 2.3L Turbo diesel engine with increased output.

Code A Exhaust Emission
C EC 91/441/EEC, US ' 83
X EC 91/441/EEC, stage 2#
none ECE R 83 A (as R 15.04)
* ECE R 83 A (as R 15.04)

Unit Code B 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

Note: * = any character, # = Stricter limits for ca.1996

Code C Compression Ratio
G <= 8.5
L > 8.5 to 9.0
N > 9.0 to 9.5
S > 9.5 to 10.0 V Carburettor
X > 10.0 to 11.5
Y > 11.5

Code D Mixture system
E Multi-point Fuel Injection
Z Central Injection
D Diesel
V Carburettor

Code E Specific Version (if quoted) Code X Fuel system
B IBC

C Corp. Ignition System

F Vehicles for Authorities
H High output/Supercharging
I Irmscher

J Throttled Output
K Komplex
L Low output/supercharging
P Power adapted

R Increased Output

T Turbo

U Uruguay

V Volume model

W Venezuela

2 Family II engine

otros ejemplos
X16XEL (el mío..)
X-Norma anticontaminante EC 91/441/EEC
16- cilindrada (1600 cc)
X - compresión entre 10 y 11,5 (tiene 10.5)
E- inyección multipunto
L - "salida baja"