urquattroforum

Grüße an alle
Ich bin die Wiederherstellung einer URI 1981 und ich in dem Motorzylinderkopf 035 103 373 AD gefunden, ist der Motor stattdessen ein KG-Code, wahrscheinlich, weil es in der Vergangenheit war gebrochen. Die Frage ist folgende: der Kopf ist über einen Motor WR-Code? Link meiner Restauration, danke.

greetings to all
I'm restoring a URI 1981, and I found in the engine cylinder head 035 103 373 AD, the engine instead is a KG code, probably because in the past it was broken. The question is the following: the head is above an engine WR code? link of my restoration, thanks.

viewtopic.php?f=22&t=9941

The KG-block is good, much better than a WR block because of the better crankcase ventilation. From the head we need pictures of the combustion chamber in there. If it is KG too you will have too high compression. I don't know if anyone else can match the number, I don't have the experience.

Best regards

Stefan

Ok thanks a lot. Pics of the chamber.
Sorry but the exaust valve is 40mm?

Hi,
man kann es nicht so richtig erkennen. Wenn da 2 Abflachungen im Brennraum sind ist es wohl kein WR-Kopf. Die untere Abflachung ist gut zu erkennen, die obere sieht kleiner aus, wenn da überhaupt eine ist. Sind da Risse zwischen den Ventilen? Woran ist der Motor gestorben?

Gruß

Stefan

Once more in English:
The head looks like KG because of the 2 flat stuctures in the round combustion chamber of the head. There are heads without these structures or with only one of those flat things. They enhance the compression.
Is it cracked between the valves? What is the problem of the dismounted engine? If it is driven with too high compression you will get wholes in the pistons and knocking noises during turbo compression.
If it is a KG-engine installed in a WR-environment this is very likely. You will need a KG-control unit with its wiring an knock sensor or you must reduce compression by using WR-pistons. The head has not so much influence, The WR-pistons with its deep cavity make the main difference.

Best regards

Stefan

hello and thanks in demand: there are no breakages to the valve seats and the valves are ok. the engine died just because he was out for 20 years and you have to rebuild it. I put the link of the restoration of my URI, thanks.

Thanks @StefanS of the response, in fact wanted to mount the pistons of the WR motor with higher combustion chamber. I did not know that the WR tested had not one of the two flat sides, I will look other newspapers to understand what you said, thanks again.