TDI engines were VW's first attempt with direct injection diesel engines, but they also marked VW's first electronically controlled diesel engine. These engines first came out in the early 90's in Europe. They claimed to be around 20% more efficient than the old swirl chamber diesel engines. (But I don't know why my Golf TDI never got the same fuel mileage as my 86 diesel Jetta.) They remain popular as transplant engines, but few people like all the electronics on a 30 year old engine. It's a lot of work to figure out all the wires. As an alternative, the TDI engine's electronic injector pump can be replaced by an older style fully mechanical VE style pump. Instead of the VP37 pump, and older style pump can be built to run the engine. The mechanical TDI pump, or MTDI pump, or M-TDI pump has to be custom built for this purpose, but will control the engine with good power just fine without all the electronics. It will have plenty of power as well.
If you have a project and you are looking for a small diesel engine, then a MTDI engine could be perfect for you. The pump will still need 12v to turn it on and off and a throttle cable to control the throtle. There are no more electronics needed, and frankly, after 20-30 years, they might be better off without them.
The engines I sell are completely rebuilt and ready to install with pump, injectors are turbo. I have been selling these engines for 10 years with great success.Here are the mtdis for sale here:
 Complete ALH MTDI Engine with Turbo, Manifolds and Downpipe. 10mm Rotor and .205mm nozzles.
 Vanagon MTDI Injector Pump
 Rebuilt M-TDI Injector Pump (10mm ALH)-$150 Core
 Rebuilt M-TDI Injector Pump with a 10mm Rotor (1Z/AHU)
 038129713K Intake Manifold
 ROT253208 1Z/AHU Downpipe Stub
 028130111C M-TDI Pump Sprocket
 96-99 VW TDI 1Z/AHU Turbo Gasket Set (1H0253115A & 1H0253039 Manifold Gasket)
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