the type - s 4th gen prelude isn't 11:1, whoever told you that must really think highly of their low model 4th gen. Anyways not to diss anyone cause we all got preludes but heres your ratios on stock models:

4TH GEN PRELUDES: (1992-1996)
S-Type: All F22a motors: 8.8:1 compression (s-type prelude - 4 cylinder Accords
Si-Type: H23a1: 9.8:1 compression
Vtec: H22a1: 10.0:1 compression

keep in mind this is for completely stock internal engine preludes, and I can assure you unless you put higher compression pistons or something within that realm, that there aren't any preludes with an 11.1:1 compression