removing acoustic valve on 172 cup

[franx]

Is it worth it ? and how much work ?

 

[Big Bob]

might sound like a daft question but whats the acoustic valve ?

 

[Gaz_]

Arch liner out, pull off the vaccum hose and BLANK (important) Remove all cold airfeed piping, disconnect and tape up multiplug. Is it worth it? Well it saves another KG or so, i removed mine on my 172 cup and my 182 with no problems.

 

[*Clare*]

I have had it taken of my 182... Think it took about 10 mins or so (my boyfriend did it!!!)

 

[phill172]

sorry proberly asked, but what does it do?

 

[Fred@BTM]

its there to reduce induction noise, some eu law thingy

 

[Ollie82.]

I found it made mine less jerky during gearshifts at slower speeds.

And anyway, its only a butterfly valve that opens and shuts.....one less thing to restrict any airflow can't be bad.

 

[GordonD]

might sound like a daft question but whats the acoustic valve ?

There are two ducts feeding air into the air cleaner. One is an open pipe feeding up into the bottom of the air cleaner. The other feeds into the side of the air cleaner and has a valve in it that's connected by a vacuum tube to the intake manifold so it only opens at highish revs and throttle openings.

Having only one small pipe feeding air to the air cleaner at low revs and two at higher revs and thottle openings would definitely keep the intake noise level down in normal use like on the motorway. And a knowledge of intake design suggests it should (though its not proven) improve torque a little at lower revs. All without restricting maximum power.

Of course a lot of people on this forum don't want to keep the intake noise down. They think noise equals power, that noisier is "better", or at least that other people will think their cars is more powerful if its noisier. And they think that taking the valve out will increase maximum power, but of course there's no difference between the valve removed and it open.

 

[franx]

thank you for the replies, might have a looksee under the bonnet tommorow .

 

[franx]

Arch liner out, pull off the vaccum hose and BLANK (important) Remove all cold airfeed piping, disconnect and tape up multiplug. Is it worth it? Well it saves another KG or so, i removed mine on my 172 cup and my 182 with no problems.

Hi Gaz,

excuse me for not understanding all of this, dutch guy he !
What do you mean with KG ? And what's Blank ?

I guess i must have al look before i know what we're talking about.

 

[DrR]

http://www.cliosport.net/forum/showthread.php?t=212040

 

[franx]

ahhhh doh, you mean kilogram ofcourse haha

anybody got piccies of how to do this ?

 

[Big Bob]

might sound like a daft question but whats the acoustic valve ?

There are two ducts feeding air into the air cleaner. One is an open pipe feeding up into the bottom of the air cleaner. The other feeds into the side of the air cleaner and has a valve in it that's connected by a vacuum tube to the intake manifold so it only opens at highish revs and throttle openings.

Having only one small pipe feeding air to the air cleaner at low revs and two at higher revs and thottle openings would definitely keep the intake noise level down in normal use like on the motorway. And a knowledge of intake design suggests it should (though its not proven) improve torque a little at lower revs. All without restricting maximum power.
so fromwhat your saying having an ik fitted renders it completely use less any how
Of course a lot of people on this forum don't want to keep the intake noise down. They think noise equals power, that noisier is "better", or at least that other people will think their cars is more powerful if its noisier. And they think that taking the valve out will increase maximum power, but of course there's no difference between the valve removed and it open.

so if you have an ik fitted its useless any way yes?

mines coming out.

any one got a guide to get it removed.

 

[MarkCup]

Taking mine off has made no noticable difference to either performance or sound.

But it has removed weight, and weight is the enemy of performance and economy...so it is worth it.