V12 AAV hose size
#1
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V12 AAV hose size
Nothing important here. Just something I wonder about from time-to-time.
Why are the AAV hoses so large? That is, large diameter?
Whereas the opening in the AAV that air passes through is about the size of the tip of my little finger?
What's at play here? The thermo-dynamics of air flow compounded by the coefficients of linear expansion...to offset the inevitable turbo-encabulator effect?
Cheers
DD
Why are the AAV hoses so large? That is, large diameter?
Whereas the opening in the AAV that air passes through is about the size of the tip of my little finger?
What's at play here? The thermo-dynamics of air flow compounded by the coefficients of linear expansion...to offset the inevitable turbo-encabulator effect?
Cheers
DD
#2
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Doug (10-18-2017)
#3
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I've eliminated my AAV as well.....which is why the question came to mind again.
Just a curiosity thing.
I'm working on an alternate idle speed adjustment scheme. And, possibly, incorporation of an AAV from a different car. I say 'possibly' because, although it'll be an interesting project, I don't view the AAV function as essential and have other things I'd rather spend the time on right now.
Cheers
DD
Just a curiosity thing.
I'm working on an alternate idle speed adjustment scheme. And, possibly, incorporation of an AAV from a different car. I say 'possibly' because, although it'll be an interesting project, I don't view the AAV function as essential and have other things I'd rather spend the time on right now.
Cheers
DD
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Grant Francis (10-18-2017)
#4
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Greg in France (10-18-2017)
#5
Cabin switch for the solenoid. Works wonderfully well in cold weather; I switch it off after about 800 yards. A few diagrams and snaps attached.
Greg
Last edited by Greg in France; 10-19-2017 at 01:36 AM.
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#6
I have a small question, it is about AAV, too.
After replacing rotor :
https://www.jaguarforums.com/forum/x...lm9624-190618/
I connected hose for distributor vacuum :
But I have no vacuum there (11). Only when I cover the hole for AAV in filter case, then I have here vacuum, which is equal to vacuum in inlet manifold. It is clear. All air for idling engine is going through hoses (13).
But when I open this hole, vacuum is again zero. It does not depend on RPM. It is normal (I think not) ? Or I have a mistake somewhere, or I have forgotten something ?
Thanks Roman
After replacing rotor :
https://www.jaguarforums.com/forum/x...lm9624-190618/
I connected hose for distributor vacuum :
But I have no vacuum there (11). Only when I cover the hole for AAV in filter case, then I have here vacuum, which is equal to vacuum in inlet manifold. It is clear. All air for idling engine is going through hoses (13).
But when I open this hole, vacuum is again zero. It does not depend on RPM. It is normal (I think not) ? Or I have a mistake somewhere, or I have forgotten something ?
Thanks Roman
#7
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#8
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As I understand it....
The filter/inlet is at atmospheric pressure. Incoming air rushes past the vent hose connection at the AAV creating a lower pressure....sort of like a venturi effect, I reckon. This pressure differential 'pulls' a small amount of air through the distributor vent system. So, no, you won't feel 'vacuum' in the sense you're thinking of.
The same principle (whatever it is correctly called) is used on your climate control system. The tubing for you cabin temperature sensor is exposed to cabin air at one end and is connected to the main air flow ducting at the other. When air blows thru the main ducting it pulls air through the temp sensor tube to create a small amount of air movement across the sensor.
Cheers
DD
The filter/inlet is at atmospheric pressure. Incoming air rushes past the vent hose connection at the AAV creating a lower pressure....sort of like a venturi effect, I reckon. This pressure differential 'pulls' a small amount of air through the distributor vent system. So, no, you won't feel 'vacuum' in the sense you're thinking of.
The same principle (whatever it is correctly called) is used on your climate control system. The tubing for you cabin temperature sensor is exposed to cabin air at one end and is connected to the main air flow ducting at the other. When air blows thru the main ducting it pulls air through the temp sensor tube to create a small amount of air movement across the sensor.
Cheers
DD
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roman_mg (10-19-2017)
#9
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Grant Francis (10-19-2017)
#10
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Grant Francis (10-19-2017)