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Joined: Dec 2002
Posts: 937
Veteran CEG\'er
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Veteran CEG\'er
Joined: Dec 2002
Posts: 937 |
Originally posted by DemonSVT:
If you mean raising the cylinder pressure to roughly 6.8 atmospheres (14.7psi natural plus 85.3psi "forced" ) then that's your answer. 6.8 x 2.5 = 17 liters of effective displacement. Provided of course the temperature doesn't change. (100% efficient intercooler - hey this is a fantasy setup.
Uh Oh, I should have explicitly stated that all pressures are "overpressures." By 0psi pressure I mean atmospheric (not vacuum) â?? same as a tire gauge would read at sea level. Iâ??ll say overpressure from now on.
Since I had a bite on the first question, I will provide an answer.
Effective displacement is based on equal masses of air pumped.
At 60degF and atmospheric pressure ("standard conditions"), air has a density of 1.22 g/liter
At 60degF and 100psi overpressure, air has a density of 9.59 g/liter
Therefore, a contour 2.5L engine pumps 3.05 g of air for every two revolutions at atmospheric pressure.
If this engine is placed in a 100 psi overpressure environment, it will pump 23.98g of air for every two revolutions.
The size of the engine that will pump 23.98 g of air per every two revolutions at atmospheric pressure is:
23.98g / 1.22g/L = 19.7L
Thus, 19.7L is the effective displacement of a 2.5L contour engine being fed 60degF air at 100psi overpressure.
Before I get slammed, the assumption is that the engine crankshaft is rotated slowly enough that intake restrictions are not a factor.
At 60degF and 85.3psi overpressure (DemonSVT's assumption), air has a density of 7.13 g/liter giving a 14.6L effective diplacement. Actually, DemonSVT's answer is dead right if you assume that air behaves as an "ideal gas," PV=nRT.
The other questions require that you know air density as a function of pressure and temperature. The following free program will provide that data.
Uconeer 2.3: Freeware unit conversion and materials property calculator
99 Tropic Green SVT, Tan Leather, 20K miles, "Nice Twin" (factory stock).
99 Tropic Green SVT, Tan Leather, 28K miles, "Evil Twin" (Turbo AER 3L and more in progress)
96 Red LX, Opal Grey Leather 2.5L, ATX, 22K miles
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Joined: Apr 2003
Posts: 2,779
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Apr 2003
Posts: 2,779 |
Quote:
Methane is corrosive & toxic for starters.
Plus it would destroy your O2 sensors and converters.
 I hope you guys didn't take that seriously, although from the looks of Ubercows response, I think he did. Methane?! Come on Uber, I guess I'll stop joking then before I make you believe other ridiculously stupid things.....you should put diesel fuel in your tank, it makes you go twice as fast.... 
99 SVTC, T-Red, #652/2760-12.8.1998
Mother#@%@!* did I sound abstract?
I hope it sounded more confusin than that!
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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
Joined: Sep 2000
Posts: 9,602 |
Originally posted by JonnySVT:
I hope you guys didn't take that seriously, although from the looks of Ubercows response, I think he did. Methane?! Come on Uber, I guess I'll stop joking then before I make you believe other ridiculously stupid things.....you should put diesel fuel in your tank, it makes you go twice as fast....
I was being "polite"
I know it's shocking but I'm like that occasionally. 
Diesel fuel is great for you car. I use it all the time... 
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Joined: Jun 2004
Posts: 35
New CEG\'er
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OP
New CEG\'er
Joined: Jun 2004
Posts: 35 |
No, I wouldn't put methane in my car (but maybe in someone elses, lol) I was just joking. But diesel fuel, hmm maybe  lol
95 Contour GL V6 ATX
full of little experimental mods that make me happy
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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
Joined: Sep 2000
Posts: 9,602 |
Originally posted by JEDsContour:
Uh Oh, I should have explicitly stated that all pressures are "overpressures." By 0psi pressure I mean atmospheric (not vacuum) â?? same as a tire gauge would read at sea level. Iâ??ll say overpressure from now on.
The other questions require that you know air density as a function of pressure and temperature. The following free program will provide that data.
Uconeer 2.3: Freeware unit conversion and materials property calculator
Well either that or a trick question of a trick question.
Since you "specifically" stated 100 psi in the intake (not cylinders) there was no way to answer the question accurately.
I took it to mean 100psi in the cylinders and we all know 1 atmosphere is always present right.  Well actually the speed of the intake charge acts as a natural supercharging effect so there again is another variable changing the final output. I mean my car at 7200rpm is pulling about .8psi of boost all on it's own...  heheh...
So I used a 100% VE and no supercharging effect and took it you meant 100psi total cylinder pressure before compression.
Good link. It will save digging out all those formulas. 
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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