my vectra is powered by a 1.6i X16SZ has about 72-75 HP
... not really a spectacular engine on paper , and when i got the car i was a little worried it would be a slug, as some people call it underpowered, but i think they're used to more powerfull engines and are a little lazy with the gearchange.
it's a great engine for economy that will keep up with normal traffic, acceleration from 0 to 50 km/h is very fast, but after that is becomes a little slower because of the tall gears... on the highway however it's a very lively car, and you feel it wants to go fast, but without wanting to go too fast. some say the 1.8i was a better engine for the vectra, but if you don't expect a racecar the 1.6i is a very nice engine...