looking at the june issue of land rover owner internastional on the second-hand price guide thingy i noticed that there are three different hp values for the 2.25 litre petrol engine. in the s2 it gave out 77hp and so did the early s3 petrols. then it changed to the five-bearing engine (was this the same time as it changed the compression ratio from 7:1 to 8:1?) in
1980 and subsequently gave out 86hp. then the early 90/110's with the 2.25 petrol only had 74hp. what caused this drop? i know the holden 202 in australia had a 15% power drop after tougher emmision controls came in. there lazy response was to tune down the cam or something to make it comply but ended up with a particularly gutless engine. so my two questions are,1)what caused this drop in the 2.25 petrol from the series 3 to the 90/110?
2)what is the difference between a three main-bearing engine and a five main-bearing engine.thanks.