D4D engine

Submitted: Tuesday, Aug 13, 2013 at 18:10
ThreadID: 103749 Views:2319 Replies:4 FollowUps:3
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This question follows the thread 103727 from Kelvin B. I posted a question late , as follows

'I know I have a lot to learn, but what exactly is a D4D CRDI engine and why is this a better option'.

Your comments will be well regarded,
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Reply By: olcoolone - Tuesday, Aug 13, 2013 at 18:45

Tuesday, Aug 13, 2013 at 18:45
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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Follow Up By: Steve M1 (NSW) - Tuesday, Aug 13, 2013 at 18:57

Tuesday, Aug 13, 2013 at 18:57
as stated above Common Rail Diesel Injection D4D is the current/latest offering in Prados.

Available in the 120 series from late 07> 09, when the 150 series took over.

Those two vehicles have a few differences to consider: the 120 has a 180L fuel capacity as opposed to the 150's 150 L capacity. More room in the luggage area and a bit easier to install a 2nd battery in the engine bay with a ready-made space available.

I think the 150 engine is a little more tweaked up and slightly better odo/fuel monitoring display, neater arrangement for folding down back seats. I'm sure there was something else but current owners will probably fill in the gaps.
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Follow Up By: Member - Frank P (NSW) - Tuesday, Aug 13, 2013 at 20:35

Tuesday, Aug 13, 2013 at 20:35
"as stated above Common Rail Diesel Injection D4D is the current/latest offering in Prados."

The same technology is now employed in Toyota's V8 diesels, either with one turbo or two depending on the vehicle. The 200 Series gets two. I can't remember all the others that get only one - the more "agricultural" ones :-)
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Reply By: Ross M - Tuesday, Aug 13, 2013 at 18:55

Tuesday, Aug 13, 2013 at 18:55
hooks

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
AnswerID: 516353

Reply By: deserter - Tuesday, Aug 13, 2013 at 19:14

Tuesday, Aug 13, 2013 at 19:14
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.
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Reply By: Bazooka - Tuesday, Aug 13, 2013 at 23:09

Tuesday, Aug 13, 2013 at 23:09
Just remember to trade it in before the injectors are due for replacement.
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Follow Up By: hooks - Wednesday, Aug 14, 2013 at 06:55

Wednesday, Aug 14, 2013 at 06:55
Thanks everyone. I now understand the terminology used in describing these engines :)
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