Pg1 is the best box but it'd be difficult to get it to fit in a metro, it's physically bigger and heavier. If the car doesn't weigh much you're fine with a r65u as it won't be too stressed and standard r65 ratios are closer than standard pg1.
Ok once again the PG1 bolts straight in its fitted as std in an MGF which has basically the same subframe. no issues with space what so ever
I would also like to ask how many VVC conversions you have done in a metro / rover 100 as you are giving incorrect information
However a R65U will be fine (as long as you dont give it full beans in reverse) i know of one fitted to a turbo k series 1.8 with 200bhp in a metro however the owner doesnt think it will last
240 bhp k series is possible if you want to be rebuilding the thing every 5 minutes. I got the impression the original poster was talking about a occasional track day/road car... Not a full blown racing moneypit which is what a 240bhp k series would be!! Forced induction... I know of one supercharged k series that had a serious amount spent on it, kept blowing head gaskets. Had all the right gaskets, professionally assembled, only low boost at 200bhp... Couldn't sort it and ditched it for vtec power because he'd already wasted enough money.
Then whoever built the forced induction engine knows nothing about k series engines and probably used the MLS gasket rather than the elastomer and should move to simpler v-tecs. I have 300bhp from a turbo k that has been running for 5 years and only one HGF caused by the idiot driving, me.
video is here it has a PG1 from a 220 turbo, which is bigger and heavier than the std pg1 it fitted no problems using the MGF subframe.....again note no problems fitting the PG1http://www.youtube.com/watch?v=Cyl9IBJDYGk
You say it'll start fine with a smaller flywheel.. Hmm methinks you need to get on your push bike and try to set off in 6th
Smaller gear will spin faster eventually when it gets going but an r65 starter on a vvc with that little flywheel struggles to actually initially get going. It's a common issue with r65 vvc combos on kit cars and metros.
Oops my bad always thought a faster spinning engine helps to start a car, but it also depends on the no of teeth of the starter too. Either way it will happily turn over a VVC. All R65U VVC engined metros use the std starter and no-one has an issue.
Can i also ask how many VVC conversions you have done to metros
Liquid Knight, thanks for the hello. The t series would be a nice engine for the metro, but only as a mid engine rwd, of which i know of only one, as it is a very heavy engine in comparison to the K series so the metro would handle like a boat