Thread: Origin of TD5 engine.

Originally Posted by garrycol

The TD5 was developed from the L series Freelander engine - basically the L series with an extra cylinder - a lot of the internals are similar but the head design and injection systems are updated. The L series is a first generation electronic diesel (pump controlled but not injectors) and was replaced with the common rail TD4. The L series and TD5 are Rover designed engines (L series used in a range of cars) and have nothing to do with BMW.

Garry

almost, a 2ltr 4 2.5ltr 5 and a 3lter 6 cylinder using basically the same components, smart really with only the major parts being different, crank, cam, Head and manifolds.

As already posted originally the injectors were to be cam operated with an electronically ( Lucas) controlled fuel pump. Quite smart really, still a mechanically controlled common rail injection system with a fuel pump more inline with what we see ( or NZ sees) with the Jap 300 TDI. Then along came BMW, junks all that and replaces it with common rail, hence why the injector harness is run inside the rocker cover and the internal placement of the injectors.

Originally Posted by clean32

almost, a 2ltr 4 2.5ltr 5 and a 3lter 6 cylinder using basically the same components, smart really with only the major parts being different, crank, cam, Head and manifolds.

As already posted originally the injectors were to be cam operated with an electronically ( Lucas) controlled fuel pump. Quite smart really, still a mechanically controlled common rail injection system with a fuel pump more inline with what we see ( or NZ sees) with the Jap 300 TDI. Then along came BMW, junks all that and replaces it with common rail, hence why the injector harness is run inside the rocker cover and the internal placement of the injectors.

But it's not common rail, as BMW/Bosch use, (a simplified system) it's a unit injector setup.

I believe the story went they (Rover) borrowed or pinched people from either Detroit Diesel (the DD60 Series was the first electronically controlled unit injector setup in the late eighties) or CAT for the unit injector setup.

Thank you all for your input. I'm glad to hear that it really is a Land Rover engine after all these years of doubt!

crl

I think the unit injectors allow much much higher injectin pressures (around 23,000-27,000psi on the TD5???) and those little units are probably also largely responsible for the increased power outputs from diesel engines, especially in comparison to common rail etc.

I think the TD5 was the first non truck (or heavy) motor to use this technology. Mind you peizo may be the go these days.

Originally Posted by rick130

But it's not common rail, as BMW/Bosch use, (a simplified system) it's a unit injector setup..

We may be talking the same but with different words.

Each injector would have been activated by a lobe on the cam and not as it is now by an electrical pulse.

The high pressure fuel pump would have been electrically controlled as to pressure in the common rail or fuel line to all the injectors. The only controlling required would have been overall pressure as the pulse dwell time was fixed by the cam


.[/QUOTE]

The TD5 fuel pump supplies high pressure fuel to the injectors. The extremely high injection pressures are generated inside the actual injector by the inbuilt pressure pump (cam activated). The injector is opened / operated by electronic injector pulse (ECU generated).

Originally Posted by BigJon

The TD5 fuel pump supplies high pressure fuel to the injectors. The extremely high injection pressures are generated inside the actual injector by the inbuilt pressure pump (cam activated). The injector is opened / operated by electronic injector pulse (ECU generated).

AHHHH ok got it now, thanks