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Air Intake
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jon_viola   
Sun Sep 21 2014, 10:32pm
Joined: Aug 21 2014
Member No: #1829
Location: Sussex
 Hi,

Just doing some odd cleaning jobs on the car and noticed there is a hole cut into the air intake so that it draws air from the engine bay as well as the outside of the car.

I was thinking that this will make the charge hotter and reduce power/mpg. Has anyone tried covering this hole so the car only draws only outside air?
Tjensen   
Sun Sep 21 2014, 11:01pm
Joined: Jul 17 2012
Member No: #954
Location: Bergen
 Usually , it is a flap of some kind , so that the engine uses engine bay air in the warm-up period and in cold environment. In some old cars it was manual (DS ?). I am not sure how this is done in C6
gmerry   
Mon Sep 22 2014, 06:35am
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Hi Jon, this has been covered before if you check the archive.

The intake system is tuned acoustically, don't mess with it.

Regards

G

PS, earlier replies hinted at petrol carburettor intakes where avoidance of carburettor freezing was the main design criteria. Obviously does not apply to an unthrottled turbo-charged diesel.
Tjensen   
Mon Sep 22 2014, 07:31am
Joined: Jul 17 2012
Member No: #954
Location: Bergen
 I searched and found 2 old topics, but none of them explain. Is it a flap somewhere ? How is warm/cold air used and mixed ? I changed my air filter to a "sport filter" in the CX Turbo, after that it took all the air from inside and got a bit hotter (OK in Norway, not when driving fast in southern Europe.
C6Dave   
Mon Sep 22 2014, 09:22am

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
Tjensen wrote ...

I searhed and found 2 old topics, but none of them explain. Is it a flap somewhere ?

There is no 'flap' as such, if you look at the air intake at the front grill end, there is a cut away section which confuses people.

It's part of the intake design. There is a picture on site in a thread, but I can't find it ATM.
Website
jon_viola   
Mon Sep 22 2014, 09:47am
Joined: Aug 21 2014
Member No: #1829
Location: Sussex
 Yep thats what it looks like to me. On my 3.0 car there doesnt seem to be a flap just a cut out. It may be accoustically tuned but its definitely less efficient if its bringing the charge temps up.
speedfix   
Mon Sep 22 2014, 10:44am
Joined: Sep 28 2012
Member No: #1043
Location: south west
 "The intake system is tuned acoustically, don't mess with it."

It can be altered if you can find room !

And I had always thought the position and design and water being heavier than air was to help the air not water being sucked in the intake.

As for the hot air no probs as the intercooler will take care of that.
All IMO.
jon_viola   
Mon Oct 06 2014, 05:42pm
Joined: Aug 21 2014
Member No: #1829
Location: Sussex
 Ok so update time.

I covered the hole temporarily to see the effect. Subjectivly I would say that initial pick up is much better. My MPG has definitely improved since. Eg varied driving incl country roads, some m'way (with traffic jam) and a little town total 120miles round trip the trip computer said 43.5mpg. I would say thats a 1-2mpg improvement on my car.

I would be interested to see if anyone else gets the same results- get the gaffer tape out seal it properly and carefully, and obviously quickly removable if you don't like it.

BTW the car sounds no different at all at any speed.

 

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