Systematic classification of ICD codes?

Hi everyone,

Is there any logic or system to the engine codes used for TDIs?

At least they all start with the letter "A" (except for the 1Z, which later mutated into an AHU).
But otherwise, at least to me, the MKB codes seem to be randomly generated...

Hi Ulf,

That's why my old 1500cc gasoline engine had the engine code JB.
The old VK Diesel EX, the SDI 1Y, my GLI DX (original European model)...

Okay, seriously now:
The model numbers will be assigned sequentially according to their development. There are model numbers that were never made publicly available. It was only present during the developmental stage.
When it became apparent that the alphanumeric combinations would quickly become exhausted, the system was changed to use three digits. We will eventually end up at B..

Hi,

@Ulf: That's exactly the question I was also going to ask...

Bertil, are you sure about the order? For example, everything that starts with "AE":

AEA: Gasoline engine, 1.6L, 75 horsepower.
AEE, same in the next version.
AEF Diesel 1.9 64 hp
AEV Gasoline 1.0 45 HP
AEX Gasoline 1.4 60 HP

came out at 94.95 - that might be about right, but the engines are very different.

The 1Z engine was upgraded to the AHU, which places it quite a few steps behind the later AFN engine in the production sequence.

Then there are engines that have multiple engine codes, for example, AEEX=AKV=APQ=ANW, or for diesel engines, AHU=ALE, although these may be different versions.

Everything according to my Polo 6N repair manual, but it seems there are also patterns, for example, in 1994, AD* and AE* were popular, while in 1999, AM*...AR* were common -> this would again support that theory.

One could also expand the question to: What changes would justify a new main classification system?

Best regards,

Jan.

Hi Jan,

The AHU engine is technically the same on paper, but it has different emissions control systems (ESP).
And the ALE is an EU3 1Z (which only had EU2). The ALE had a pump that generated more pressure. For this, new pipes and nozzles were necessary (it is no longer a single-cylinder engine).

So, I once heard about the allocation of MKB numbers from a VW engineer. Because the development of each stage doesn't always take the same amount of time, it's possible for milestones to occur later than their expected order in the sequence.

As soon as the engine is modified (e.g., emissions standards, fuel mixture preparation), we also assign a new engine code. Therefore, it can happen that engines appear identical externally but contain different parts. See 1Z and ALE -- you can't see the changes directly (you can only see them by comparing the transaction numbers).

Hi.

Then it seems the proportion of unfinished engines is quite high.

AXR isn't too far from "AZZ" anymore.
The A-series offers 26² = 672 different names.

If we estimate that since the switch to the "3-series" naming convention, perhaps 100 different engines have been sold (gasoline and diesel - please correct me if this estimate is wrong), then for every "published" engine, there are almost 6 "stillbirths."

ulf wrote:

... Then it seems the proportion of unfinished engines is quite high.

... you can assume that.

Quote:

AXR isn't too far from "AZZ" anymore. The A-series offers 26² = 672 different names. If we estimate that since the switch to the 3-series naming convention, perhaps 100 different engines have been sold (gasoline and diesel - please correct me if the order of magnitude is wrong), then for every "published" engine, there are almost 6 "stillbirths".

Okay, so I would be careful about the "100 motor variants" claim... Keep in mind that VW also includes VW do Brasil, VW South Africa, and VW Singapore. They have their own development departments and sell cars with engines that no one here has ever seen before.
VW Singapore is a client of ours, and I know of a vehicle there that is equipped with completely different engines (I know of 10 different variants) than those commonly used in Europe.
Please don't forget Bentley, Lamborghini, and Bugatti – they also get VW engine numbers!!

For all those who feel nostalgic:
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Hi,

It seems that most people here are only aware of a few differences between the various (diesel) engines.
Wouldn't it be interesting to put all of this into an Excel spreadsheet so that we can, for example, compare the different motors with each other?

This could be expanded to include the part numbers themselves, along with a brief description.
For example, the differences between engines like the 1Z and AHU, or even worse, the 1Z and AFN, are frequently asked about.
With a table like that, none of this would be a problem anymore.

Similarly, it would be a table listing the engine codes for all the diesel engines.
There are so many of them now; I doubt most people have any idea what's going on.

You could also start by focusing on the 4-cylinder engines first, and then expand to include the 5-cylinder, 6-cylinder, and 8/10-cylinder engines once those are completed.
I don't think a comparison between engines with different numbers of cylinders is very interesting.

It's just an idea, really.

Regards,
Thomas.

Hi,

I just stumbled upon a page that at least explains the system somewhat.

Click on 'Workshop' and then click on 'VW Engine Identification Codes.'
While they focus heavily on gasoline engines and aren't exactly up-to-date in that area (things tend to move a bit slower in Switzerland...), you can still recognize the underlying principles.
It started with individual letters, going through the entire alphabet.
Because almost all the individual letters are very old engines from the 60s (Type 1, etc.). For example, the 'B' is a 1.6-liter engine with 47 horsepower, originally from the Type 1 and Type 2 models.

Does anyone know about the 'CYP'? It seems to be a type of 1Z engine, with 66 kW and a 1.9-liter TDI, for the Golf Cabriolet from 1996 onwards, at least according to this list. Where is the difference again???

Otherwise, I think the idea with the (Excel) list is quite good!http://www.86c.ch/{MARKER}

Hi Markus,

CYP is a gearbox for a TDI engine, I'm quite sure of that.

If an engine is intended for export to countries with different emission regulations, which require different components or settings, the engine will have a different engine code.