Removing the air intake flap

[TANKSLAPPER]

AS QUOTED FROM NORTHLOOP

"If you need any bmw inside info let me know as my best mate works for BMW and has had to replace 2 engines in CSL's now due to people removing the flap from the air intake, causing the head gasket to go!"

What do you reckon


I only down side to removing the flap allows water up the air duct in the bumper straight into the engine when pouring down.

Normal, you give it the beans in the dry allowing for the air flap to open.

[shimmy]

my flap was removed July 09 and HG went September 09

[_Nathan_]

The air still has to pass through an air filter, the amount of air let in to the engine is still controlled by the throttle butterflys and based on the MAP sensor, temp sensor and throttle position \ engine load etc, probably just the BMW service dept seeing something different and making that assumption

[mattCSLnut]

Originally Posted by shimmy

my flap was removed July 09 and HG went September 09

I'm glad then to have replaced the missing flap in my CSL

[shane@mbtech]

Originally Posted by TANKSLAPPER

AS QUOTED FROM NORTHLOOP

"If you need any bmw inside info let me know as my best mate works for BMW and has had to replace 2 engines in CSL's now due to people removing the flap from the air intake, causing the head gasket to go!"

What do you reckon


I only down side to removing the flap allows water up the air duct in the bumper straight into the engine when pouring down.

Normal, you give it the beans in the dry allowing for the air flap to open.

I reckon its bullshit

[alexk]

Originally Posted by lawsy

I reckon its bullshit

I don't think so.
Personally, when it's raining a lot, I close the sport button and drive more carefully so as not to allow water to go inside.

[_Nathan_]

There is an air filter and anyway why would water be any more likely to get in through the front intake than the wheel arch one olr the scoop that takes air from the from grill and directs it towards the intake (which is also there on the standard M3).

Do you ever do over 6.5k rpm in the wet? the flap will be open anyway - do you really think that BMW could sell a car that cannot be used when it is raining?

[_Nathan_]

The original poster on Northloop has now stated he isn't aware of the actual facts and what he wrote may not be accurate...

[shane@mbtech]

Originally Posted by alexk

I don't think so.
Personally, when it's raining a lot, I close the sport button and drive more carefully so as not to allow water to go inside.

Water in your in combustion chamber is more likely to "hydraulic" the engine than cause headgasket failure.

If it was enough water in the mixture it would cause misfires. But the water from outside can still enter your intake system even with flap intact.

I know many cars running on throttle bodies which dont suffer headgasket failures.

[shimmy]

there is a section in the CSL booklet which states that you must travel below 5000k revs and sport off when in 'adverse weather conditions'. Do you think they mean heavy rain?