Low pressure, would the Yanmar be considered low pressure? I can't find any numbers on turbo pressure..
Who makes a IDI engine? Yanmar, Perkins, and cummins are all direct injection engines... Why is that a disaster? You get the best fuel economy that way.
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The BT4 cummins is common rail now? Didn't realize that.
Kubota is IDI, AKA beta marine
Why do you want IDI is simple. Because with an IDI the injectors are far less sensitive to impurities in the fuel. They are also less sensitive to air in the fuel. You may actually cook off an entire set of direct injection injectors and the pump if you have run too much air thru them.
I am actually an expert on this. With college education, and 15 years experience.
A DI system is ultra high pressure. Pumps and injectors will not last as long.
With the nasty dock fuel we can get, and the water content, Its not a good idea on the water. Also keep in mind these DI engines can shut down if a sensor goes bad. They are sensitive.
Play this scenario in your mind. Your coming in to the dock, in adverse docking conditions. The crank sensor goes out. The engine shuts down. I hope your insurance is paid up.
No idea if the yanmar is low pressure or not. But turbos have come a long way.