Lawrence Johnson wrote:

> Per,
> I may be wrong but I learned that lean burning engines have higher exhaust
> temperatures whereas overly rich burning engines are cooled by the evaporation of
> the injected fuel.
> Any truth to this?

To be honest, I dont know. I do know that chipped engines get more fuel, thus making
more power, and also generatig more heat. I have seen pictures of pistons where a melt
down had happened. The engine was an Audi/VW 1,9 TDI 90 hp, which had been chipped to
145 hp. The piston was ugly, and it melted because of excessive heat. Clearly, this
must show on the exhaust temps.

PerL
87 Syncro 112i