[ALephart]

Is it safe to assume the difference in power between the 71HP model and the 84HP model is just the compression ratio?

All the best,
Aaron Lephart

 

[Old smart]

Nope, it's a turbocharger. The 84PS turbo actually has less of a compression ratio than the 61PS and 71PS gassers (10:1 vice 11.4:1).