The only thing you need from the engine is the engine block. The rest you can throw away. Most new Intake manifold are made of plastic. So not suitable for the use of wood gas even if you are temperature resistant up to 120 degrees. The complete injection to the engine controller you can not use. Even the ignition, you can not use as it is normally operated from the engine control unit.Pascal> Yes, that's what I meant, most of the gas conversions are aftermarket job either performed by 3rd party little garages, but sometimes it's a direct cooperation of the auto manufacturer with the gas mod vendor like Landi-Renzo and in that case the ICE engine also could be slightly modified inside, e.g. replaced stronger valve seats etc. : http://www.auto-power-girl.com/high-res ... 2009-1.jpg
The idea about Fiat 1.1-1.2L engine as possible candidate for mCHP was because of small engine yet large production run over the years, but since ~2012 it seems all must be in turbo now (even bi-fuel model) so I'm not sure this is suitable without expensive mods/addons anymore, but there were non turbo small engine gas Fiats decade before that and I'm not sure they got some stronger parts like valve seats or not. But it still seems Renault group is selling most of these gas versions among other brands.
So you see there is little usable from the engine ...
And that's why my opinion is take what is often available. Here in Germany, are the small 1 liter engines. The motor also does not have to be brand new. If a used engine block costs 50 € you can replace for 100 times.
regards Pascal