Renault f engine is a good engine, has oil sprays etc , why is it so crap compared to the b16-18 lumps, those engines are prob no better than the f engine from the factory, only difference is there is a huge aftermarket parts scene that's been developed in the states due to the cult following.
I'm not saying its a crap engine just not as good, if it were I would still own my raider and have an f series engine in it. I did not end up with a civic and a b series engine because I liked them I just want to go fast . I know rpm is not the be all and end all but look at the difference in max rpm's between the engines, a mildly messed about with honda engine will happily see 10500-11000+ rpm, not forgetting revs x torque =hp. Also to make that 900hp you talk of is going to need a fairly big blower to make those kind of numbers, on a 1800-2000cc motor your not likely to see any real boost before 6000-7000 rpm so as it comes on boost you run out of rpm.
pretty sure Renault engines could achieve the same results if they had the developed parts thrown at them?
what type of valve train do they b 16/18 engines run?
there are other types of engine out there that are just as powerful