whats this turbo thing?
12-08-03, 11:28 PM
#26
Originally posted by NZConvertible
Ever looked inside a modern airbox? Nearly all will have a bellmouth leading into the AFM. Any opening will have it's performance improved by adding a bellmouth.
Those particular intakes may not be able to be used on a relatively stock FC, but that doesn't mean smaller ones can't be used in other locations to improve flow.
Actually it's the bellmouth that reduces the venturi effect. By smoothing the change of direction as the air enters the pipe, the airflow follows the pipe's shape instead of forming a venturi shape.
I took $1000's of dollars worth of courses too, now I do it for a living.
Ever looked inside a modern airbox? Nearly all will have a bellmouth leading into the AFM. Any opening will have it's performance improved by adding a bellmouth.
Those particular intakes may not be able to be used on a relatively stock FC, but that doesn't mean smaller ones can't be used in other locations to improve flow.
Actually it's the bellmouth that reduces the venturi effect. By smoothing the change of direction as the air enters the pipe, the airflow follows the pipe's shape instead of forming a venturi shape.
I took $1000's of dollars worth of courses too, now I do it for a living.
I may very well be wrong but the bell mouth that is there causes the flow to be transitioned smoothly just like a ventury tube only the bell mouth does not expand again thus isn't it still part of the ventury effect?
12-09-03, 02:26 AM
#28
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Originally posted by jreynish
What did you take if you don't mind me asking?
What did you take if you don't mind me asking?
I may very well be wrong but the bell mouth that is there causes the flow to be transitioned smoothly just like a ventury tube only the bell mouth does not expand again thus isn't it still part of the ventury effect?
It's hard to describe clearly without a picture.
12-09-03, 09:12 AM
#29
I'd like to applaud NZ and Jreynish for not blowing up. I totally saw a cockfight coming then I saw something I've never seen on this forum. Jreynish asked a question to see where the difference of opinion was!!! Holy ****!!! You guys should be presidents of nuclear weapon wielding countries!!
NZ I dub thee ruler of China!
Jreynish I dub thee defeater of G. Dubya.
Good Job guys!!!
NZ I dub thee ruler of China!
Jreynish I dub thee defeater of G. Dubya.
Good Job guys!!!
12-09-03, 01:21 PM
#31
This is the ventury tube (most common) now, the airflow is accelerated when the opening of the tube get smaller for the same amount of air can flow through the narrower part of the pipe. This is just one of the many effects contributed to ventury's theory's! the bell mouth is similar to wind whistleing accross the side of a square building! Am I right?
12-09-03, 01:44 PM
#32
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Yep, that's pretty much right. Air entering a straight piece of pipe flows like you've draw. Adding a bellmouth to the entry stops it from contracting like that, and it follows the shape of the bellmouth instead.
Here's an example to show you how effective a bellmouth is. Using 100L/s of air entering a 75mm pipe, the pressure drop at the entry is equivalent to a 3m length of straight pipe. If you add a bellmouth with a radius equal to 0.1 of the pipe diameter that pressure drop becomes the equivalent of a 0.5m length of straight pipe. Even just adding a cone to the entry (much easier to make than a bellmouth) makes a considerable difference.
Here's an example to show you how effective a bellmouth is. Using 100L/s of air entering a 75mm pipe, the pressure drop at the entry is equivalent to a 3m length of straight pipe. If you add a bellmouth with a radius equal to 0.1 of the pipe diameter that pressure drop becomes the equivalent of a 0.5m length of straight pipe. Even just adding a cone to the entry (much easier to make than a bellmouth) makes a considerable difference.
12-09-03, 03:08 PM
#35
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In a turbo it helps flow somewhat, but in a NA it can be a big deal.
The S5's VDI is an example of how pulse wave tuning can increase power.
In a NA, you have a pulsed wave intake, and length the tubes can have a significant charging effect.
Check out the variable "trombone" intake on Mazda's LeMans car.
The S5's VDI is an example of how pulse wave tuning can increase power.
In a NA, you have a pulsed wave intake, and length the tubes can have a significant charging effect.
Check out the variable "trombone" intake on Mazda's LeMans car.
12-09-03, 04:44 PM
#36
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Wrong topic.
You're right, but it's not really the length of the tube that's the issue here, it's the shape of the inlet. In this case it doesn't matter if it's turbo or not.
You're right, but it's not really the length of the tube that's the issue here, it's the shape of the inlet. In this case it doesn't matter if it's turbo or not.
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