idiot here. how can diesel engines with the same displacement

Different shaped cylinders, different airflow rates, the list goes on. Theres more to an engine then displacement.

>>14971190

but at what cost other than price does this additional power come?

>>14971221
Fuel economy. Driving characteristics. Many different things.

>>14971221
I don't think anyone on /o/ is qualified to do a write up on the thermodynamics of diesel engines, but long story short, better materials + more specialized parts = more costly engines

>>14971180
Injection volume, air volume, boost pressure, etc

>>14971229

so basically the range rover just has a better diesel engine than the touareg?

>>14971295

doesnt that increase the conpression ratio?

File: download_20140701_185051.jpg (49KB, 480x640px) Image search: [Google]

49KB, 480x640px

>mfw I drive an f30 efficient dynamics manual diesel box
>mfw fucking 4.5 l/100km in city traffic
>mfw still a rear drive bmw with acceptable 7'7 seconds 0-100 and glorious 380Nm
Dieselpowerintensifies.jpg

>>14971308
Compression ratio is static, you can only change it if you somehow change physical parts that affect the crank and stroke.
Increasing the boost pressure does increase the cylinder pressure, I think.

The answer is simple. Japan is shit at making engines. Their technology is always behind that of the West.

>>14971180
the mitsu engine is not a high performance one.
the vw engine is a mid tier one, there's a 300hp/650Nm variant
the Jag one is pretty old tech but runs big boost

>>14971180
Different turbos, different amounts of boost.

>>14971180

Marketing.

>>14971180
INJECTORS

How is this hard?

You have 3 things.

Air. Fuel, and spark make boom.
This is a diesel, so spark is entirely compression. Static.

The space is the same, static.

how more power?

More air and fuel.

More boom.

Duh?

>>14972603
Fisher Price levels of explanation and grammar here, but he's right.

>>14971180
The same way a petrol engine can have different characteristics for the same configuration and displacement. Head flow, cam profile, tune, exhaust and intake design, combustion chamber design, etc.

>>14971180
rod length to stroke ratio

intake, head, and exhaust system flow characteristics.

THE EXACT SAME REASON YOU GET SHIT MILEAGE USING E85 OVER GASOLINE!!

Diesel has more energy stored in a gallon of fuel compared to gas, just as gas has more energy stored in it over E85. I'm surprised I was the first to say this.

>Also, engine design, airflow etc...

>>14974510
completely irrelevant to what OP is asking

File: black-f250-rolls-coal-600.jpg (21KB, 599x338px) Image search: [Google]

21KB, 599x338px

>>14971180

>>14974559
How so? My understanding of the question is "Why are you getting different power/torque numbers out of the ""same"" motor?".

I different amount of energy stored is the fuels would contribute to this, right? Just like you have power/mpg loss when you use two different fuels (gas vs. E85) in literally the exact same motor...

>>14974620
it's a diesel to diesel comparison lad

>>14971359
Your are correct
And to go a step further boost is measured in psi over the ambient atmospheric pressure, which is 15psi

File: image.gif (2MB, 256x192px)

2MB, 256x192px

>>14974633
MFW I realize I'm blind and completely misunderstood the question

File: cutaway (105).jpg (467KB, 1600x1200px) Image search: [Google]

467KB, 1600x1200px

>>14974673
np bud

>>14974620
How high do they each rev?
RPMs = powah

Like another anon said one might have more boost pressure.

Also some engines have more restrictive intakes.

>>14971180
>how can diesel engines with the same displacement and compression ratios have different power?

The same way a 3.0 inline 6, an 3.0 V6, an 3.0 inline 4, and a 3.0 V8 wont produce the same power. Different airflow, materials, weight, RPM redlines, etc.

if I understand correctly he's also asking if more torque per litre means an engine is less robust?