Wow! What an incredible machine! Respect, esprcially for the clean and well-organised engine bay... :shock:
Have you had the original wheel hubs drilled to the 4-bolt pattern, or are the entire hubs adapted from another car? Are they 4x100mm?
BTW, do you have any more detailed info on the Colombian 1300cc R4s? Technical code (the "R112?" code), exact engine displacement, engine code, bhp etc. Or any links to sites with more info on these '90-'91 1300cc R4s? I've tried to search trough Google several times, but with no luck.
The reason I'm asking is that here in Finland there are strict rules about fitting a bigger and more powerful engine to a car. We're allowed to fit an engine that's 20% bigger, 20% more powerful and 10% heavier than the largest available "reference engine" fitted to a particular car model by the manufacturer originally. Anything bigger or more powerful than that, and we'll have to apply for a (costly) special approval with detailed sctructural calculations etc.
The biggest R4 "reference" engine recognized by the authorities (or Renault network) here in Europe is the trusty old 1108cc with 34 bhp. That means that in Finland the biggest replacement engine allowed without any special approvals would be a 1330cc (= +20%) and 40,8 bhp (= +20%) lump. Which means even the lowest spec 1397cc / 60 bhp version from e.g. the Renault 9 is out of the question.
But if we had proof that an original, factory-made 1300cc (1289cc?) version exists, then we'd be allowed to fit up to about 1550cc engines "with no questions asked".
However, the good thing about our engine replacement legislation is that once approved & MOT'd, any further "normal" tuning of the replacement engine is allowed. That means that nothing would then prohibit us from fitting e.g. the 1397cc / 60bhp C1J engine with a cross-flow Alpine/Gordini head, twin Weber 40 DCOEs, headers etc...
("Normal tuning" DOES exclude fundamental changes to an engine like 8-valve to 16-valve conversions, fitting of a turbo etc.)