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So a professor tells me that the best vehicle's engine efficiency is about....

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Boilers are around 70% to 80% efficient with some high perf ones getting as high as 95%. I guess we should all go back to steam. I just worked on a 750 Hp model the other day, 250 psi of steam and 375 psi of feedwater.
 
* The StarRotor engine is projected to be very efficient (45-60%).

By simply replacing conventional engines (15-20% efficiency) with a StarRotor engine, fuel economy will double or triple. For example, a conventional luxury car getting about 25 mpg on the highway would get about 75 mpg. A conventional economy car getting 40 mpg would get about 120 mpg.
Click to expand...
taken from http://www.starrotor.com/Engine.htm

That's pretty neat. I wonder if it is really possible. Looks promising, I think.
 
Originally posted by: mercanucaribe

Um.. No.

The higher compression ratio allows a diesel engine to be more efficient than a comparable spark ignition engine, although the calorific value of the fuel is slightly lower at 45.3 megajoules per kilogram to gasoline at 45.8 MJ/kg. The increased fuel economy of the diesel over the petrol engine means that the diesel produces less carbon dioxide (CO2) per unit distance.
Click to expand...

http://en.wikipedia.org/wiki/Diesel_engine

Diesels of ALL displacements are more efficient of gasoline engines of comparable displacement.
Click to expand...

You just said "um.. no" then proceeded to confirm what I just said, that diesels are more efficient. You can spare me the basics like your wikipedia link, this is nothing new to me. To the average 18 year old forum member, maybe, but that was 12 years ago for me.

I'm very familiar with engines. I don't need noobs telling me the absolute basics. But thanks for the link.

It kind of bothers me that when I come onto a forum dominated by car noobs, I have people thinking they're telling me something new. I just got done arguing with someone on Slashdot who was getting lost in details trying to tell me that a gasoline engine changes throttle settings by adjusting the ignition timing, since the amount of air entering the engine is "always the same" per intake stroke. I also had someone tell me that a diesel engine can't run without an electrical system, since the spark plugs won't work (lol).



 
Originally posted by: SwiftWind
* The StarRotor engine is projected to be very efficient (45-60%).

By simply replacing conventional engines (15-20% efficiency) with a StarRotor engine, fuel economy will double or triple. For example, a conventional luxury car getting about 25 mpg on the highway would get about 75 mpg. A conventional economy car getting 40 mpg would get about 120 mpg.
Click to expand...
taken from http://www.starrotor.com/Engine.htm

That's pretty neat. I wonder if it is really possible. Looks promising, I think.
Click to expand...

heh, I was reading the FAQ and they don't even have a working engine yet. Atleast they're honest.
 
Originally posted by: SwiftWind
* The StarRotor engine is projected to be very efficient (45-60%).

By simply replacing conventional engines (15-20% efficiency) with a StarRotor engine, fuel economy will double or triple. For example, a conventional luxury car getting about 25 mpg on the highway would get about 75 mpg. A conventional economy car getting 40 mpg would get about 120 mpg.
Click to expand...
taken from http://www.starrotor.com/Engine.htm

That's pretty neat. I wonder if it is really possible. Looks promising, I think.
Click to expand...

Looks like yet another "just around the corner" vaporware product that makes bold claims and never lives up to the hype. We see this every few months.
 
Originally posted by: OS

heh, I was reading the FAQ and they don't even have a working engine yet. Atleast they're honest.
Click to expand...

Yeah, the professor has been working on it for a few years with a really small research company here. They just finished one of the compressors for it. They even say its a couple of more years off.

e does the enviromental talks(about a week) in the Engineering Ethics class every semester. He brings in a model that you can turn by crank to see how the rotor actually moves. Its pretty neat.
 
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