idiot here. how can diesel engines with the same displacement and compression ratios have different horsepower and torque?
3.0l mitsu diesel 200hp, 450nm of torque, 16:1 17:1 compression
3.0l vw diesel 240hp, 550nm of torque, same compression
3.0l jag diesel 250-270hp, 600nm of torque, same compression
Different shaped cylinders, different airflow rates, the list goes on. Theres more to an engine then displacement.
but at what cost other than price does this additional power come?
Fuel economy. Driving characteristics. Many different things.
I don't think anyone on Veeky Forums 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
Injection volume, air volume, boost pressure, etc
so basically the range rover just has a better diesel engine than the touareg?
doesnt that increase the conpression ratio?
>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
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.
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
Different turbos, different amounts of boost.
Marketing.
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?
Fisher Price levels of explanation and grammar here, but he's right.
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.
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...
completely irrelevant to what OP is asking
...
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...
it's a diesel to diesel comparison lad
Your are correct
And to go a step further boost is measured in psi over the ambient atmospheric pressure, which is 15psi
MFW I realize I'm blind and completely misunderstood the question
np bud
How high do they each rev?
RPMs = powah
Like another user said one might have more boost pressure.
Also some engines have more restrictive intakes.
>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?