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kalv · Sep 12th, 2007, 12:27 PM

Guys,

Was cleaning my pipercross air filter on my MCS last night and noticed a hole in the back of the air box (bulkhead end)?

What's it for? I always though air-boxes were meant to be sealed so the air goes in one direction - to the engine?

Japper · Sep 12th, 2007, 12:56 PM

Quote: Originally Posted by kalv (original)

Guys,

Was cleaning my pipercross air filter on my MCS last night and noticed a hole in the back of the air box (bulkhead end)?

What's it for? I always though air-boxes were meant to be sealed so the air goes in one direction - to the engine?

It's to allow extra air in from the scuttle panel and also a bit more induction sound out to your ears

The Works airbox has an extra ( lot larger ) hole.

Richard Crofts · Sep 12th, 2007, 01:13 PM

Ai! Tis true on the JCW ... can't say I noticed it on my stock one thoguh. Buts its been ages since i had mine on !

kalv · Sep 12th, 2007, 01:22 PM

So one could make this hole bigger??

MINIAC · Sep 12th, 2007, 04:25 PM

Quote: Originally Posted by kalv (original)

So one could make this hole bigger??

I dont' see how you could make the hole bigger ... it sits below the panel filter and is connected by a rubber boot to the partition between the engine bay and cowl area.

ignote · Sep 18th, 2007, 04:33 PM

Quote: Originally Posted by MINIAC (original)

I dont' see how you could make the hole bigger ... it sits below the panel filter and is connected by a rubber boot to the partition between the engine bay and cowl area.

You can make the hole bigger. I used a hole saw on mine and cut the hole in the bottom of the box and the partition. I then sealed the connection between the two with a cut piece of foam.

Alan Wolfe · Sep 18th, 2007, 08:18 PM

Has anybody done any measurements on whether the base of the windshield is a high pressure or low pressure area? It looks to me like it would be a low pressure area. It would tend to suck air out of the airbox. Therefore I agree the hole is probably an acoustic modification. Making the hole bigger may starve the engine for air and make it run leaner, or reduce input of fuel / horsepower to keep the engine from going lean.

Alan

Sep 12th, 2007, 12:27 PM	#1
kalv MINI2 Regular My Classifieds Join Date: Jun 2007 Location: Birmingham Local Time: 11:01 PM Posts: 99 Offline	Hole in back of Air box..? Guys, Was cleaning my pipercross air filter on my MCS last night and noticed a hole in the back of the air box (bulkhead end)? What's it for? I always though air-boxes were meant to be sealed so the air goes in one direction - to the engine? "bhp sells cars, torque makes them move..."

Sep 12th, 2007, 12:56 PM	#2 (permalink)
Japper MINI2 Master My Classifieds Join Date: Jul 2006 Location: Oil Country Local Time: 10:01 PM Posts: 1,041 Offline	Quote: Originally Posted by kalv (original) Guys, Was cleaning my pipercross air filter on my MCS last night and noticed a hole in the back of the air box (bulkhead end)? What's it for? I always though air-boxes were meant to be sealed so the air goes in one direction - to the engine? It's to allow extra air in from the scuttle panel and also a bit more induction sound out to your ears The Works airbox has an extra ( lot larger ) hole. 06 HB/W MCS Chilli

Sep 12th, 2007, 01:22 PM	#4 (permalink)
kalv MINI2 Regular My Classifieds Join Date: Jun 2007 Location: Birmingham Local Time: 11:01 PM Posts: 99 Offline	So one could make this hole bigger?? "bhp sells cars, torque makes them move..."

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Sep 12th, 2007, 01:13 PM	#3 (permalink)
Richard Crofts THE STICK Join Date: Feb 2003 Location: Worcestershire WR15 Local Time: 10:01 PM Posts: 3,261 Offline	Ai! Tis true on the JCW ... can't say I noticed it on my stock one thoguh. Buts its been ages since i had mine on !

Sep 12th, 2007, 04:25 PM	#5 (permalink)
MINIAC MINI Profiler Join Date: Feb 2001 Location: City By The Bay Local Time: 02:01 PM Posts: 8,618 Online	Quote: Originally Posted by kalv (original) So one could make this hole bigger?? I dont' see how you could make the hole bigger ... it sits below the panel filter and is connected by a rubber boot to the partition between the engine bay and cowl area.

Sep 18th, 2007, 04:33 PM	#6 (permalink)
ignote MINI2 Newbie Join Date: Jul 2005 Location: Maryland Local Time: 05:01 PM Posts: 34 Offline	Quote: Originally Posted by MINIAC (original) I dont' see how you could make the hole bigger ... it sits below the panel filter and is connected by a rubber boot to the partition between the engine bay and cowl area. You can make the hole bigger. I used a hole saw on mine and cut the hole in the bottom of the box and the partition. I then sealed the connection between the two with a cut piece of foam.

Sep 18th, 2007, 08:18 PM	#7 (permalink)
Alan Wolfe MINI2 Regular Join Date: Dec 2002 Location: Denton, Tx Local Time: 06:01 PM Posts: 59 Offline	Has anybody done any measurements on whether the base of the windshield is a high pressure or low pressure area? It looks to me like it would be a low pressure area. It would tend to suck air out of the airbox. Therefore I agree the hole is probably an acoustic modification. Making the hole bigger may starve the engine for air and make it run leaner, or reduce input of fuel / horsepower to keep the engine from going lean. Alan

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