its not that much heavier otherwise the 130 zetec escort would be closer on 0-60 times to the rs 2000.
xr3i 130 - 8.9
rs2000 - 8.2
takes a lot to shed 0.7 secs.
the 2.0l zetec has 136bhp which is the same as s2 rs turbo 136bhp and
the rs turbo is alot lighter than rs2000 but the rs2000 does 0-60 in the same time as a s2!
trust me its a good engine, thats why ford moved on to it.