On what Mike. . .
Only on the Internet. . . . .
Not on Gasoline on a good Engine Dyno..LOL
I don't just sit here and make this stuff up!
0.55 Mach is great.
0.628 Mach is about the best I have seen.
-------------------------------------------------------
One must defeat these simple principles:
The High-Perf industry states that 146 cfm / Sq." is the most
one can flow through a well radius having an area of 1 Sq."
at a depression of 28" of water.
Regarding Compressible Flow Bernoulli states:
This occurs for air flow when the absolute pressure ratio is 0.528, i.e. when the
downstream absolute pressure (P2) is 52.8% of the upstream absolute pressure (P1).
Sonic Velocity occurs for air flow when P2 /P1 equals 0.528.
-----------------------------------------------------------------
Anyone know how to defeat the above. . . .
I know where you can get a well paying job. . LOL
-----------------------------------------------------------------
Let me break it down then you can respond:
You got at the best 14.7 psi pressure on the inlet side of the 90mm TB.
Explain to me how your going to move 2200 fwHP
or (2200 * 1.5)= 3,300 cfm or air through an
90mm orifice that has an area of 9.8757 Sq."?
That would be. . .
=> 3300 / 9.8757)= 334.1532 cfm / Sq."
That would be. . .
=> A velocity of. . .
(334.1532 * 2.4)= 801.9676 fps velocity on a flow bench @ 28"
That would be. . .
=> (2 * 801.9676)= 1,603.9352 fps velocity in the air.
That would be. . .
=> (1603.9352 / 1116)= 1.4411 Mach
So maybe your using 'Rocket Fuel'..
===================================
Below is a post I made sometime back on this forum
regarding Bernoulli and compressible flow for reference:
-what is compressible flow-
This occurs for air flow when the absolute pressure ratio is 0.528, i.e. when the
downstream absolute pressure (P2) is 52.8% of the upstream absolute pressure (P1).
Sonic Velocity occurs for air flow when P2 /P1 equals 0.528.
Sonic velocity refers to the speed of sound and a mach number is associated with that.
In an IC Engine sonic velocity is considered to be ~55% of the speed of sound.
Most in the industry tend to agree that the value of 1116 feet per second represents
the speed of sound when referencing that phenomena with an IC Engine.
Some simply use the value of 52.8%, which correlates with the value of 0.528 given above.
As an example;
When P2 is 14.7 psia and P1 is 27.84 psia,
sonic velocity / velocity choke occurs through the orifice.
As P1 further increases there is no further increase in the velocity of the air flowing
through the orifice, but an increase in mass flow can be generated by a Supercharger as
it will compress the air molecules together thereby increasing the density of the air.
The density ratio increases at the square root of the pressure.
----------------------------------------------------------------------
So if we add 1-BAR of boost, we have a pressure ratio of 2-BAR Absolute.
If we square root the value of 2, we arrive at a value of 1.414.
So we effectively have now added 41.4% air mass to the engine.
But to double the density we would need to have 4-BAR of Absolute Pressure,
as the square root of 4, is equal to the value of 2.
Take care Mike!