Boot92
DSM Grease Monkey
Registered: 05/05/09
Posts: 498
|
|
| |
Reply with quote | #31 |
It just doesnt make sense to me.
If your lowering the velocity but raising the Intake, doesn't that make it just about the same?
anyways personally i wouldn't waste my time on it.
IMO
__________________
1994 Honda Accord LX, F22B2, Auto, Spectra Filter, 2 1\4In catback magnaflow exhaust.
1984 Yamaha Virago 700, 698cc, 6 speed, rebuilt carbs, wrapped exhaust. |
| Loading... | | |
94eclipse4g37
1eights god
Registered: 10/17/05
Posts: 1,078
|
|
| |
Reply with quote | #32 |
It will increase both over-all velocity and volume.
And it's common larger throttle body's give a substantial gain in torque/mid range power.
Here's why.
It's called the Venturi Effect.
Pretty picture time.
What happens is, when an intake draws in air, it's drawing from a large area with low air pressure. (relatively) The motor physically draws from a large air mass and forces it into a smaller space. (intake tube)
This increases absolute air pressure in the intake tract, (this is why larger diameter intakes flow more) with the increased velocity, (Pressure does decrease velocity,) but being there's less restriction in the intake tract it equals out, and the absolute pressure will drop because of the conservation of energy rule, but Kinetic energy increases as a result of this.
Basically, when air passes into the throttle body, it loses velocity because it's smaller than most intakes. (Most require a 3"-2.5" adapter) This increases absolute pressure for the duration of the throttle body, therefor it loses velocity due to forcing a mass of air to rapidly move into a smaller area, (increased pressure, lower velocity) and then a rapid decrease in pressure after the throttle body because of the intake plenum being a larger area than the throttle body. Pressure is lost because due to expansion. Big, small, then big again.
So, because nine time out of ten, the intake tube is larger than the throttle body, this becomes a restriction whereas porting and or larger throttle body's come into play.
So what happens when you increase the size of the "constriction" i.e. the throttle body in the intake tract? You gain intake velocity, and maintain a more constant pressure through the intake tract resulting in performance gains.
I hope that helps everyone. I'm not the best at explaining things sometimes. Any questions, just ask.
__________________
 |
| Loading... | | |
caffeinetripp
Captain Obvious
Registered: 02/05/07
Posts: 1,447
|
|
| |
Reply with quote | #33 |
Win. Suggest re-posting that as a technical article.
__________________
No more 4G37. In its place is a TSi AWD. Still in the DSM game of course. The 37 gave some of its parts to the TSi. |
| Loading... | | |
