D4D engine

D4D are Toyota's current generation of common rail diesel injection systems, they were first introduced to the public in 1999. D4D is the injection system reference, not the engine reference.

Being common rail and more high tech than the old diesels; they offer more power, better economy and NVH improvements over the much older designed Toyota diesels.

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The engine, depending on how a manufacturer displays the numbers and letters can mean the same thing or sometimes different.

"Diesel", "4 stroke", "Direct (into the cylinder) injection", using a high pressure 20,000psi or more "Common", "Rail" (where all injectors are fed off the one high pressure rail of pressurized diesel fuel "Diesel" "Intercooled",.

Somewhere it the above makers description "Turbocharged" got missed out, but if intercooled, it will be turboed too, as that is the norm in today's world so not included.

No one commonly intercools a non turbo engine.

All petrol injected cars for many years now have been "CRP" engines, never mentioned as this though, and operate a relatively low psi ie(40psi it varies) with throttle opening, but the petrol injectors all feed off a common rail. Who ever says Common Rail Petrol?

The concept of common rail is not new, the pressure of the CRD never used to be possible, now it is.

Cheers
Ross M

Your question "what exactly is a D4D CRDI engine and why is this a better option'.". If you are asking why it is better than its predecessor. The new D4D in 2007 introduced a 30% rise in power as well as a 30% reduction in fuel over the older motor. It was a major upgrade.

Just remember to trade it in before the injectors are due for replacement.