The Technical Questions Thread

[cmcpokey]

Originally Posted by CapnBoost

But it makes 5,608,312 lb/ft (7,603,850.09 Nm) at 102rpm and displaces 25,480 liters. That's just over 298Nm/L. It's turbocharged, and uses a waste heat recovery system to turn a generator and provide heat for the ship. It is approximately 50% thermally efficient.

needs V-TEC yo!

[f6fhellcat13]

Originally Posted by f6fhellcat13

Are there any naturally-aspirated gasoline (or even diesel?) engines that produce more than 100 ftlb/L 135 Nm/L?
I cannot think of any off the top of my head, but I would think that any that did have this ratio would only exist in the realm of the severely undersquare. Would such engines exist for commercial applications more so than for passenger vehicles?

Originally Posted by CapnBoost

I don't think that you'll be able to fit this in a car-
But it makes 5,608,312 lb/ft (7,603,850.09 Nm) at 102rpm and displaces 25,480 liters. That's just over 298Nm/L. It's turbocharged, and uses a waste heat recovery system to turn a generator and provide heat for the ship. It is approximately 50% thermally efficient.

Fair enough, but it's turbocharged.

Originally Posted by cmcpokey

needs V-TEC yo!

truth.

[CapnBoost]

Fair enough, I think that the specification will probably be in an aircraft, ship, or perhaps trucking application. Where extreme efficiency is a requirement.

[f6fhellcat13]

Originally Posted by CapnBoost

Fair enough, I think that the specification will probably be in an aircraft, ship, or perhaps trucking application. Where extreme efficiency is a requirement.

And as your post shows, the means to that end usually seems to be some sort of energy recovery system, like a turbo, because of the relative ease of its application.

[CapnBoost]

Re-edited and posted:

From the wikipedia list of automotive (which would exclude most of the things I just said) superlatives:
Most specific torque (torque per unit displacement)
* Petrol (naturally-aspirated) - 120 N·m (89 lb·ft)/litre (540 N·m (400 lb·ft) Ferrari 458 Italia
* Petrol (naturally-aspirated pistonless rotary engine) - 170.8 N•m (126.0 ft•lbf)/litre (222 N•m (164 ft•lbf)) - 2005 Mazda RX-8
* Diesel - 233 N•m (172.2 ft•lbf)/litre (500 N•m (369 ft•lbf)) - 2008 Mercedes-Benz C-Class 250CDI BlueEfficiency

(Note: the Mercedes diesel is turbocharged)

[LeonOfTheDead]

Originally Posted by CapnBoost

(Note: the Mercedes diesel is turbocharged)

Twice.

[NSXType-R]

I have a quick question about units.

I had an argument with my parents about ounces, the liquid and the weight measurement (by the way, we're using American ounces throughout, liquids and mass or weights).

My mother states that one liquid ounce is equivalent to one ounce in weight.

I believe not.

I don't think 1 pound of bricks is equivalent in weight to 16 ounces of water (without the container, etc.).

[fpv_gtho]

lol, maybe with water they equal each other (i dont actually know, but a kilo of water equals a litre of water) but there are so many liquids of different density that its obviously wrong.

[pimento]

A litre of water weighs 1kilo at some specific temperature.. it might be 4 Celsius for some reason. I'd imagine they'd've done that with ounces too.. that'd make sense anyway. Why not try weighing it?

[LeonOfTheDead]

iirc 1 KG H2O = 1 Liter H2O at 25 °C and 1 atm of pressure.

[johnnynumfiv]

Also 1ml = 1 cm³ right?

[NSXType-R]

Originally Posted by fpv_gtho

lol, maybe with water they equal each other (i dont actually know, but a kilo of water equals a litre of water) but there are so many liquids of different density that its obviously wrong.

Yeah, I thought I was correct. If the density of the liquid is all wrong, then you'd be all screwed.

Originally Posted by johnnynumfiv

Also 1ml = 1 cm³ right?

Yes. That is one very cool thing about the Metric system, which doesn't work the same way as the American system.

[Matra et Alpine]

Originally Posted by johnnynumfiv

Also 1ml = 1 cm³ right?

[pedant]
Was true of water at on atmosphere concentration and ~4 degrees Centigrade.
HOWEVER, last ISO re-adjustments meant it ended up 0.999999something !!
So the correct answer is "usually"
[/pedant]

[CapnBoost]

Originally Posted by johnnynumfiv

Also 1ml = 1 cm³ right?

=1g iirc

[ruim20]

Originally Posted by CapnBoost

=1g iirc

10g iirc, as 10cm3 = 1kg