ALH vs. AFN Motor Difference

Hello. I have already tried searching several times. Could not find anything decent.
Can anyone here really tell the difference between the 90PS TDI ALH engine and the 110PS AFN engine? So, everything that is different from the 20PS engine.
Some people say the engines are identical. Others say there are some differences. But what exactly could they not say? Thank you in advance for your help. Best regards, Bernd

UI, but the question is still unclear.

how can they be equal when they have 20 horsepower difference?

- ALH in G4
- AFN in G3 and Passat 3B

and then the usual differences.
The ALH will not have a VTG, right? ????

Of course, the ALH definitely has a VTG loader.

The ALH has VTG and also already has 5-hole nozzles.

The AFN was also installed in the G4 and, as far as I know, uses a different MSG, a different loader (compressor), and a different pump control system.

AFN on G4 ???

I always thought that the G4 only had a different engine than the G3.

At least all the G4 TDI vehicles I have seen have a tilted ESP and a "hanging" engine mount.

The G3s have the engine "standing" vertically, with all the bearings located at the bottom, and the ESP parallel to the head.

Does anyone have pictures of G4 with AFN?

m;

I believe I meant the AHF, not the AFN. I believe the AFN was often offered as a stronger option for the 1Z engine, particularly during the Golf 3 era.
But the ALH and AHF motors should be very, very similar.
A key difference is certainly the different hole sizes of the injectors.
But otherwise? You need to help me...

AHF sounds more like G4

At least it never existed in the G3!

m;

I'll count the ALH together:

- VTG (GT1749V)
- two-valve nozzles, 0.184, 220 bar opening pressure
- standing oil filter
- Euro III

The ASV (with 81kW) then primarily only has 0.205' nozzles. According to AKTE, it also has other upper lower arm bearing shells. That's it then.

The AGR, as a precursor to the ALH, looks visually identical, but has a wastegate loader.

ah... I just saw that the AHF has a 190 bar opening pressure on the nozzles, so it probably has Euro-2. Unfortunately, I don't have a list of the components, so I don't know if the AHF has a VTG or wastegate.

See you, Gremlin

"other upper thigh bearing surfaces", also.
Would I now install the 0.205 inch nozzles in my ALH, would I then have the 110 horsepower engine? Right? The only difference: the other upper bearing shells.
Do you consider them important? (When it comes to durability?)
Best regards, Bernd

I believe the AFN was most often offered as a stronger option for the 1Z engine during the Golf 3 era.


Initially, this was only available towards the end, as the AFN was only introduced around the 1997 model year.

Best regards, WarLord

Hi,

the AHF has VTG - it's actually Rainers Motors, where he conducted all the tests and logs.

By the way, the Golf 4 also had AHF and ASV engines, both with 81 kW. Whether and how they differ... I don't know.

In the Ibiza 6K, the AHF was never fitted. Instead, the 81 kW engine was directly replaced with an ASV engine, starting with the 6K GP01 model (1999).

Best regards,

Jan

By the way, the Golf 4 also had AHF and ASV engines, both with 81 kW. Whether and how they differ... I don't know.


nozzles:
AHF 190bar euro-2
ASV 220bar euro-3

See you, Gremlin

Hello everyone!

Most of this has already been mentioned.
Historically, there was initially the AGR (90 hp, Wastegate charger, Euro 2, 0.184" nozzles, 190/300 bar opening pressure). Then, based on the same engine design, the AHF engine was established, which is primarily distinguished by the components already mentioned (VTG pump, 0.205 inch nozzles, 190/300 bar opening pressure, reinforced upper connecting rod bearings, and a larger oil-water heat exchanger).
Then came the 90 hp engine, trimmed to Euro 3, which was the ALH, successor to the AGR, which was already equipped with a VTG (Variable Geometry) turbocharger. It also featured a cooled AGR (Gas-Rigid) and a liftable valve opening pressure of 220/300 bar, with identical hole diameters (0.184). The enhanced Euro 3 variant is then the ASV engine, as a successor to the AHF.
In comparison to the AHF, the only significant differences are the increased intake air pressure of 220/300 bar and the cooled AGR with a shut-off valve.

I hope that I haven't forgotten anything. If so, please complete.

Greetings
Alex

Hi,

@Donalexo:

Hmm... did the 1.9 TDI engine at the beginning of the 1990s not use the 1Z engine? And at the beginning of the 81 KW section of the AFN?

I had previously considered the AGR to be a successor to the 1Z, and the AHF to be a successor to the AFN, and in turn, to be related to the 1Z in the same way that you describe it: AGR->AHF.

Or am I wrong, and are 1Z and AGR parallel developments (which I can't imagine)?

Best regards,

Jan

HAE ???

For me, the terms "successor" and "parallel development" stand in direct opposition to each other!?!

I understand "parallel" as "simultaneously", and that is correct for 1Z and AGR NCIHT.

Because in between there were also AHU/ALE (both in G3 and modifications/successors of the 1Z)

m;

Jan6K wrote:

Hmm... did the 1.9 TDI engine at the beginning not use the 1Z engine?

I agree with that. The 1Z is the oldest 1.9L TDI EU2 with a wastegate. Also, also the EU2 Wastegate, followed by the ALE, which was the first to have a Wastegate charger with the EU3.

I can't say exactly how and where the AGR should be adjusted now.