Injection Systems

[Orcrist]

probably a dumb question for those in the know but I am wondering if the early GU direct injection engines are "common Rail" or is it just after a certain year?
I believe that common rail gives better power but at the expense of economy, and I would rather have the latter.

thanks in advance.

[mudski]

probably a dumb question for those in the know but I am wondering if the early GU direct injection engines are "common Rail" or is it just after a certain year?
I believe that common rail gives better power but at the expense of economy, and I would rather have the latter.

thanks in advance.

Different setups. Direct injection is as it states. You have the injector pump, injector lines then injectors. Common rail, have a fuel rail, in between the injector pump and injectors. Im not up to speed with these but I think the fuel rail is what controls the fuel delivery pressures to the injectors, where on a Di, the injector pump does all this. The injector pump on the CRDs pump the fuel through to the rail and injectors at a much higher pressure than a direct injection motor, hence giving a slightly better power delivery and better fuel economy.

[Hodge]

Direct injection is where the pump has 4 direct individual outputs to each corresponding injector ...

Common rail pump has only one output.
It pumps fuel into a common chamber ( kind of like a tank on a air compressor) " rail" and then from there , there are 4 individual lines all at rail pressure to injectors. Injectors are then controlled and cracked electronically.

Crd pumps are way simpler and therefore a lot cheaper too than Di pumps.

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[Orcrist]

Great info, thanks for that mudski and Hodge.