u/turbodaihatsu

Im a big fan of simple NA indirect injection petrol engines, and especially the legendary 1.2 16V D4F. However there isnt a lot of talk about its succesors, the H4D and B4D (the 1.0 SCe). My question is how reliable are they. I doubt they are as bulletproof as the D4F, but do they have any major issues? Also the SCe has a chain, instead of a belt on the 1.2, so how long is the lifespan of the chain (i ask this, because for some reason newer engines with chains, always have a comically low lifespan, almost like a belt).