Engine Sizes

Janesy B said:
It's dangerous in the same way restricted 50cc scooters are dangerous, enough speed and power to get you in a load of trouble but nothing to get you out of it.
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Interesting thought, but does the same apply for a 44ton truck?

I have got myself into trouble plenty of times using speed, I can think of few times I have ever needed speed & power to get out of trouble.

Good job given that I'm limited.......
 
Ah so regurgitated information rather than core understanding is what you rely on?

Often I see some of your technical replies, I then put that into google and the first search is obviously where you selected text and used ctrl C...
 
Im not sure how you gear down a stage of your combustion process without reducing engine output...

And then the scud or Atkinson make more sense with no where near the cost issue. When you get into the real world you will realise cost results in the biggest compromises of anything you can throw at mass produced cars.
 
Simon said:
Ah so regurgitated information rather than core understanding is what you rely on?

Often I see some of your technical replies, I then put that into google and the first search is obviously where you selected text and used ctrl C...
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It is from my understanding of the concept and also from working through the numbers for it ...

Jonnycoupe said:
Im not sure how you gear down a stage of your combustion process without reducing engine output...

And then the scud or Atkinson make more sense with no where near the cost issue. When you get into the real world you will realise cost results in the biggest compromises of anything you can throw at mass produced cars.
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You are not gearing down the output of the IC engine, you are gearing the output of the "turbine" engine, which is connected to the crank of the IC engine.
And you are only gearing this if the CVT cannot take the torque, which I think it may be able to as you are not going to be producing that much power or torque from the turbine as it is working on exhaust gasses just like a normal turbo would.

I freely admit that costs are the thing that have kept this from mass production, but we are now seeing much cheaper ways to manufacture turbine blades that would bring costs down.

The setup is basically that you have a normal IC engine, and you connect a turbine to the exhaust (just like you would with a turbo), but you do not have a compressor, instead you have the drive from the turbine be directly connected to the crank of the engine via a CVT transmission.
This way the compression stroke of the engine is actually going to be carried out by power that comes from this turbine rather than robbing power from the combustion of the actual ICE, thus you are using the "wasted" energy in the exhaust to do the compression.


You can then start coupling other interesting ideas to this, such as turbos that over-compress the air and then you expand it to make the air much colder.



There are other ways to do things too, the scope for interesting ideas is pretty immense ... and many of these were tested in the past in rally, F1, etc ... unfortunately FIA seem to love banning clever ideas that may eventually have useful real world applications
 
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Problem is the turbine now prevents a decent atkinson cycle efficiency gain of exhaust over expansion as you have choked the exhaust, the torque to add to crank would mean the turbine would be acting on a significant pressure ratio and hence engine exhaust gas evacuation becomes a problem and the VE of the engine falls through the floor. A miller cycle only work on forced induction applications when you use a charger as again it does not present a blockage to exhaust flow that increases pumping losses like this idea would. It would also rule out a typical turbo setup as there is no suitable energy left in the exhaust.

Plus the bar of soap effect of a CVT... you mayaswell use a micro flywheel to actually make the powertrain better rather than worse.
 
You should be able to couple a normal turbo with this setup.

It is also designed with Otto in mind rather than Atkinson as a means to make large amounts of power and get better VE from a small displacement.
As for the pressure ratio, it is only being required to provide enough torque to overcome the compression stroke of the engine (or as much of it as possible), that is not THAT much of a torque requirement, but there will of course be some effect yes.

EDIT: and that is before you get to the question, is the engine driving the turbine causing it to suck more air, or is the turbine driving the engine giving it a compression stroke for free
 
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Simon said:
Ah so regurgitated information rather than core understanding is what you rely on?

Often I see some of your technical replies, I then put that into google and the first search is obviously where you selected text and used ctrl C...
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lol Wiki is his friend!

I simple copy and paste clearly wasnt enough. Wording had to be altered to conceal the true source
 
Jonnycoupe said:
You're talking out your ring piece.

Cheers
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rypt said:
Less so that you half the time
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LOL@rypt.

Simon and Jonny actually know what they are talking about, more than most on this forum actually.

You just regurgitate stuff that you have read on Wikipedia then fill in the blanks without actually understanding any of it.

Hmm, I wonder who's talking out of their arse.....
 
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Gaygle said:
I saw this too, but i think i've ranted enough about downsizing already :p

2.5l I6 Turbo for a "junior" Aston Martin could be interesting though.*


*as long as it stays just for the junior ones lol
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They've already made a "Junior" Aston.....

aston-martin-cygnet.jpg
 
DreXeL said:
LOL@rypt.

Simon and Jonny actually know what they are talking about, more than most on this forum actually.

You just regurgitate stuff that you have read on Wikipedia then fill in the blanks without actually understanding any of it.

Hmm, I wonder who's talking out of their arse.....
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Jonny NEVER gives any specifics or anything and just talks

Simon talks even less.

If they both want Illl gladly go write out the whole bloody thermodynamic equations for such a setup, but then again ... since they never bother to give any details about anything there is no point.
 
rypt said:
Jonny NEVER gives any specifics or anything and just talks

Simon talks even less.

If they both want Illl gladly go write out the whole bloody thermodynamic equations for such a setup, but then again ... since they never bother to give any details about anything there is no point.
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Honestly. How damn rude!

If I gave no details about anything my posts would not exist. Quite honestly Rypt you can go boil your face in a textbook porridge if you want, with a little wikipedia sprinkled on top.
 
Open question: Is there a single person who reads rypts posts and finds them informative and interesting?

Or do we all just laugh at him?>
 
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