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Quote:
Even without Nitrous I can just pump 100+ psi of air at the push of a button through the system
 I'm speechless! You are a complete idiot!
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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Originally posted by ubercows:
Even without Nitrous I can just pump 100+ psi of air at the push of a button through the system. Even if you can turn off the blower it will put less restriction on the air intake flow because all it is is a little nozzle vs. a fan (when it is not activated)
What's wrong with this picture?
Who would ever have thought an ERAM could develop 100+ psi of air.
Here's a quizz. If you could actually pressurize a 2.5L intake to 100psi, what would the effective displacement of the engine be, or in other words, how "big" would a naturally aspirated engine have to be to consume the same mass of air/fuel mixture? Go ahead and assume room temperature air for this fantasy engine.
How about at 6 and 9 and 12 and 15 psi (practical pressures)?
What if the pressurized air is at 200 Farenheit? as opposed to 100 deg F for naturally aspirated?
I'll post some answers if no one else does.
Last edited by JEDsContour; 07/25/04 01:39 AM.
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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100psi of air/boost would be one big intake restriction (i.e. feeding your manifold via a stirring straw) or a diesel turbine for a submarine.
The prior would make less the 1 HP.
The latter would make 1.2 million HP for .00000000000000000000000001 seconds. Well maybe not that long... 
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Quote:
100psi of air/boost would be one big intake restriction (i.e. feeding your manifold via a stirring straw) or a diesel turbine for a submarine.
Not to sound dumb but...I don't understand this part? Can this be expanded on a little?
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He's saying that 100psi in a stirring straw is completely different than 100psi in a diesel turbine for a submarine. 100psi is just an abstract number until you define the size of the compressor, housing, or whatever. If you don't understand that, go back to science class. Not trying to be harsh, just saying that psi is a measurement of pressure, not airflow.
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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OP
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Sorry about the 100psi miswording. I meant an air tank pressurized at 100+ psi blowing air through a small nozzle to the intake, not pressurizing the entire intake to 100psi! A high velocity stream of air would create a Venturi Effect (take fluid dynamics 101) which would make air induction easier (like what a supercharger does). Venturi Effect
95 Contour GL V6 ATX
full of little experimental mods that make me happy
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Originally posted by ubercows:
Sorry about the 100psi miswording. I meant an air tank pressurized at 100+ psi blowing air through a small nozzle to the intake, not pressurizing the entire intake to 100psi!
A high velocity stream of air would create a Venturi Effect (take fluid dynamics 101) which would make air induction easier (like what a supercharger does).
Several problems with your thinking.
100psi of air in sufficient volume would wildly overwhelm the engine's ability to ingest the air and the majority would back flow out the filter.
That in effect would cause the MAF reading to drop and the engine to be instantly destroyed from going deadly lean.
Though depending on the size of the air tank you use the volume may be so small it doesn't make a difference either way except to lean out the engine and yet still cause damage. (Basically a self-induced intake leak  )
You see the engine just will not pull in more air then it's natural CFM draw just because you shoot air into the intake.
There is a reason that a super or turbo charger literally "caps" the intake to achieve boost. Only one way for the air to go and No reversion. Well besides when the throttle plate closes but that's different.
If you want to use nitrous as your example. Nitrous makes it's power from it's increased oxygen percentage and ultra cold temperature. It still requires the engine's natural pulling ability to draw it into the engine.
So your thinking and theory is not very sound at all.
Also the "venturi" effect does not remotely apply here so don't even bring that up.
Also while we are at it. Explain the supercharger equals the venturi effect comment?
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Yeah, the "air boost" system is just a wild experiment  . Not an "it will give me 20 hp" mod. If the air stream is pushed through the MAF is the computer smart enough to adjust the air/fuel ratio? And the phrase Venturi Effect should be vortex effect? (drafting?), a stream of air creating a negative vacuum behind it, thus drawing more air in. This is all hypothetical. Speculations are welcome  .
95 Contour GL V6 ATX
full of little experimental mods that make me happy
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Do you think that same injection system be Okay to shoot nitrous or some other explosive gas into the engine? (Just experimenting...) 
95 Contour GL V6 ATX
full of little experimental mods that make me happy
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Originally posted by JEDsContour:
Here's a quizz. If you could actually pressurize a 2.5L intake to 100psi, what would the effective displacement of the engine be, or in other words, how "big" would a naturally aspirated engine have to be to consume the same mass of air/fuel mixture? Go ahead and assume room temperature air for this fantasy engine.
How about at 6 and 9 and 12 and 15 psi (practical pressures)?
What if the pressurized air is at 200 Farenheit? as opposed to 100 deg F for naturally aspirated?
I'll post some answers if no one else does.
No takers yet?
This is a cumbersome experimental way of getting the answer:
Look at the contour V6 engine as simply an air pump. If you attach a balloon to the exhaust and rotate the engine crankshaft slowly through two revolutions, you will collect 2.5L of air in the balloon.
If you do this inside a big tank of air compressed to 100psi, you will still collect 2.5L of air. Now reduce the pressure in the tank to 0psi and measure the balloon volume after it expands fully â?? this is the number we want, the effective displacement.
You could modify the experiment to take temperature into consideration (for example 100degF at 0psi, 200degF at 12psi). Remember that air temperature increases when it is compressed (PV=nRT). Heat the compressed air tank to the temperature you are interested and rotate the crankshaft twice. Now release the pressure and measure the balloon volume after it has both fully expanded and cooled to the outside air temperature.
Anyone want to take a crack at calculating the kind of volumes you would measure?
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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