Hi again, Rosso
The 155 1,7TS was launched in ’92 like the rest of the range, but only on sale in Portugal until the model year ’94 was launched autumn ’93 at which point it was introduced on some other markets, as well. The engine has a very slightly smaller bore diameter, only 29 cc at 1749 cc less than the 1,8 (1773 cc) but without the inlet cam variator – according to what I have read and which is of a different type to the 16 valve engine’s. All the 4 cylinders 8 valve engines are of the “Alfa Nord” family (going back to the Giueletta 1290 cc of 1954) and were then very advanced (and still are) with an all alloy construction (block, head and oil sump), twin overhead cams and later twin double carburettors. It is regarded as a very reliable and strong engine – up to 300000 km before rebuilt is not uncommon. When strict anti pollution laws were introduced in the EU during the ‘80s the Twin Spark (plugs) and electronic fuel injection and ignition was introduced – the can variation was already fitted to the latest 2,0 carburettor models – a system that I never have heard should make difficulties contrary the present 16 valve (effectively a Fiat Modulo engine with a special Alfa cylinder head).
I haven’t driven neither a 155 1,8 TS or 1,7 TS (the lather never sold in DK) so I couldn’t tell if the diff. between 129 HP and 115 HP is noticeable. Apart from some minor in- and external trim differences they are otherwise alike.
Heikki is right, all Alfas includes “joyful driving”, only to some, this calls for more power than, in case of the 1,7 TS’ 115 HP to 1300 kg dry weight. My former Alfa, a 33 1,5 IE with 95 HP to 925 kg, was alright to me and I was very happy with it for the more than 6 years I owned it – it had about the same acceleration ability and a slightly lower top speed. It’s all a matter of priorities.
The one you are looking at has a good mileage and if the rest of the car looks and is in good condition and the asking price suits you, I say buy it.