I've just bought an old 1830 with a petrol (gas) car engine fitted. It is a pretty rough job but works anyway. The engine looks like a small one from a Mitsubishi all i can see is the words "Mitsubishi" on the top of the air filter case and "12 Valve" on the top of the rocker cover. I've heard of people putting 1600CC ford escort motors in The engine appears to be direct coupled to the hyd pump. No chain, no belts There is a hole in the plate below the sump I suppose to allow for oil change. I am not sure if the hole was pre existing or added when installing the engine. To connect to the hyd pump means that the water ports on the engine are at the opposite end to the radiator. This was fixed by extending the radiator hoses and installing an electric fan, it seems to work ok. The muffler is a series of multiple joins welded together - again rough but works. you could use flexible pipe instead. I have only used it for light work so far, moving mulch and some soil I set the engine to approx 1500-2000RPM and it goes ok. It is probably under powered but for what I need I guess the bonus is that I am not stressing out the rest of the poor old machine. If you want me to post some pics I will. Thermal