It doesn’t matter at all what fuel the engine is powered by or how many cylinders it has or whatnot. If you watch the video, all he does is shifting equations and taking the engine as a black box. He never makes the unneccesary assumption of what kind of engine it is. The lines in a dyno sheet with imperial units always cross at 5252 rpm if the power and torque scale share the same magnitude. Obviously, you can just a different magnitude for each scale, which is often done with Diesel engines to make reading the sheet easier. Say, the power scale from 0 to 200 bhp and the torque scale from 0 to 300 lbft. Of course, then the lines wouldn’t cross at 5250 rpm anymore but at another engine speed depending on the ratio between the two scales. This number really has no physical or technical significance.
Yeah if you’re measuring a diesel with HP and ftlb it will still cross at 5252. If the diesel never revs that high, the lines just simply never cross.
Nope, they still cross at 5252RPM as long as you use horsepower and lb-ft on the same scale. If you start changing the units (e.g. kW, Nm) or the scale, the crossing point changes.
Ahh… this brings memories from my physics class! You should become team advisor for a formula sae team. You’d love it. And hate it. But mostly love it.
I learned more physics from the video than i learned in the class..😂
I love math. Wish I knew that when I was at school!
but that’s just lbft…
but theres cars that shift before that, so wouldnt that mean thats only for gasoline?
People have gotten Cummins to rev over 5k lol
Nope, the lines simply never cross.
This the same for wankels?
It’s based on the units, not the engine. Even a freaking jet engine does that.
When May ever decides to retire from GT , i think we found a replacement with EE.
What’s so special? That’s the redline of a Dacia 1310.
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Nice video mate keep it up
What about diesel? Your looking at 3000 RPM
It doesn’t matter at all what fuel the engine is powered by or how many cylinders it has or whatnot. If you watch the video, all he does is shifting equations and taking the engine as a black box. He never makes the unneccesary assumption of what kind of engine it is. The lines in a dyno sheet with imperial units always cross at 5252 rpm if the power and torque scale share the same magnitude.
Obviously, you can just a different magnitude for each scale, which is often done with Diesel engines to make reading the sheet easier. Say, the power scale from 0 to 200 bhp and the torque scale from 0 to 300 lbft. Of course, then the lines wouldn’t cross at 5250 rpm anymore but at another engine speed depending on the ratio between the two scales.
This number really has no physical or technical significance.
EDIT: if you look at this dyno sheet (https://afepower.com/media/pdp-files/54-30392-dyno.1468022627.jpg) for example, the horsepower scales from 50 to 300 bhp but the torque scales from 200 to 550 lbft and the lines already cross at 2700 rpm.
Yeah if you’re measuring a diesel with HP and ftlb it will still cross at 5252. If the diesel never revs that high, the lines just simply never cross.
Nope, they still cross at 5252RPM as long as you use horsepower and lb-ft on the same scale. If you start changing the units (e.g. kW, Nm) or the scale, the crossing point changes.
Ahh… this brings memories from my physics class! You should become team advisor for a formula sae team. You’d love it. And hate it. But mostly love it.
I learned more physics from the video than i learned in the class..😂
I love math. Wish I knew that when I was at school!
but that’s just lbft…
but theres cars that shift before that, so wouldnt that mean thats only for gasoline?
People have gotten Cummins to rev over 5k lol
Nope, the lines simply never cross.
This the same for wankels?
It’s based on the units, not the engine. Even a freaking jet engine does that.
When May ever decides to retire from GT , i think we found a replacement with EE.
What’s so special? That’s the redline of a Dacia 1310.
Why? Because hp is tourqe x rpm
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