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Science Forum Index » Mechanics Forum » The New X-Prize...again
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| PolicySpy |
 Posted: Fri Apr 11, 2008 10:51 pm |
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Guest
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Quote: You are so fixated and fanatical about your toy you haven't even
considered
electric cars. Diesel, diesel, diesel is all you talk about. You are
obviously a nutter.
That raises some interesting points...
For instance do X-Prize road runs allow for the limited range of an electric
car ?
Do the X-Prize road runs avoid longer distance high speed cruise which could
hurt hybrid cars ?
Of course there is a formula that allows a MPG of the electric car to be
determined... |
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| PolicySpy |
| Posted: Fri Apr 11, 2008 11:07 pm |
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Guest
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Now I'll take another approach to the 100 MPG X-Prize entry...and show some
planning logic.
The European Honda Civic 2.2 diesel gets 54.3 MPG in combined driving. And
I'll put the vehicle weight at 2600 pounds.
Now If I want 108.6 MPG all I have to do is make the vehicle weight 1300
pounds ? Well the answer is no if I use the same engine but the answer is
yes if I scale the engine to the vehicle weight.
So a 1300 pound car with a 1.1 diesel engine is good for 100 MPG...
Now we make a 1300 pound car as a two-seat car or as a small four-seat car
(such as a Civic). But a mid-size car is going to come in more like 1600
pounds...and so the mid-size car is where the X-Prize is difficult.
And these cars would have tubular frames with flexible bodywork attached to
the frame and pushed down over shapers.
But the problem is that there is no 1.1 to 1.4 diesel engine currently
certified for U.S. emission standards. See if a fabrication shop or a race
car shop had an engine then they could build a car.
Now in 2009 there will be a VW 2.0 diesel engine and a Honda 2.2 diesel
engine. Now is there some way to make the large engine act like a small
engine ? Well of course lower lift camshafts might work but they would
change the characteristics of the emission outputs. Also the engine
management system would not be set correctly for the lower lift camshafts.
So how about cutting the fuel delivery to one of the cyclinders ? Well if
you know which cyclinder (if there is one) does not affect the balance of
the engine then that might work. Or you might try cutting the fuel delivery
to every cyclinder every other intake cycle... |
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| PolicySpy |
| Posted: Fri Apr 11, 2008 11:15 pm |
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Guest
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Quote: Now I'll take another approach to the 100 MPG X-Prize entry...and show
some planning logic.
The European Honda Civic 2.2 diesel gets 54.3 MPG in combined driving. And
I'll put the vehicle weight at 2600 pounds.
Now If I want 108.6 MPG all I have to do is make the vehicle weight 1300
pounds ? Well the answer is no if I use the same engine but the answer is
yes if I scale the engine to the vehicle weight.
So a 1300 pound car with a 1.1 diesel engine is good for 100 MPG...
Now we make a 1300 pound car as a two-seat car or as a small four-seat car
(such as a Civic). But a mid-size car is going to come in more like 1600
pounds...and so the mid-size car is where the X-Prize is difficult.
And these cars would have tubular frames with flexible bodywork attached
to the frame and pushed down over shapers.
But the problem is that there is no 1.1 to 1.4 diesel engine currently
certified for U.S. emission standards. See if a fabrication shop or a race
car shop had an engine then they could build a car.
Now in 2009 there will be a VW 2.0 diesel engine and a Honda 2.2 diesel
engine. Now is there some way to make the large engine act like a small
engine ? Well of course lower lift camshafts might work but they would
change the characteristics of the emission outputs. Also the engine
management system would not be set correctly for the lower lift camshafts.
So how about cutting the fuel delivery to one of the cyclinders ? Well if
you know which cyclinder (if there is one) does not affect the balance of
the engine then that might work. Or you might try cutting the fuel
delivery to every cyclinder every other intake cycle...
Oh, a two-seat car or a small four-seat car with a motorcycle engine and
transmission could come in at 1000 pounds. And Ducati has water-cooled
fuel-injected two-cyclinder four-valve-head motorcycle engines. The problem
is that the engine must be developed to meet automotive emission standards,
the engine must be developed for fuel efficiency rather than for
performance, and since the car must have climate control an air-conditioning
unit must be added to the engine... |
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| PolicySpy |
| Posted: Wed Apr 16, 2008 2:38 pm |
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Guest
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Quote: The new X-Prize is for a car that gets 100 miles-per-gallon and like the
previous X-Prize is for ten million dollars...
Not quite the requirement but here's a 3 cylinder 1.5 diesel developed to
Euro 4 emission standars...
http://www.vmmotori.it/en/01/00/01/dettaglio.jsp?id=46 |
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| PolicySpy |
| Posted: Wed Apr 16, 2008 3:10 pm |
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