RE: Re: alfa-digest V8 #169 - Airflow sensor orientation

[ltooz@domain.elided (LLe_2001)]

Hello all,
 Does K&N air filter really improve the performance at all or just costs more and troulbesomes? I remembered replacing one of those free flow air cleaner on my Lancia Scorpion, it's was just more noisy. 

Louis
91 Spider Veloce,
Sunnyvale, CA

AlfaNeely@domain.elided wrote:

>In a message dated 10/25/2001 4:36:06 PM Central Daylight Time, 
>owner-alfa-digest@domain.elided writes:
>
>
>> Date: Thu, 25 Oct 2001 11:16:45 -0700
>> From: Mike Gemelke <mike.gemelke@domain.elided>
>> Subject: Airflow sensor orientation
>> 
>> I'm trying to fit a K&N type cone filter on my '86 spider.  I got the kit
>> from IAP and put it all together per instructions, but I don't care for the
>> position of the cone.  The cone rests on the left fender-wall and is not
>> centered in the airflow that comes into the engine beside the radiator.  I
>> can modify the bracket and get enough play from the BOSCH L-Jet intake tube
>> to get the cone centered better, BUT I would have to orient the airflow
>> sensor in the vertical plane (instead of the horizontal plane that it sits
>> in atop the stock air box).  
>> 
>> Now I know that the airflow sensor has a flap/door.  What I'm concerned
>> about is the flap/door or other part of the sensor not operating correctly
>> due to this vertical orientation.  A book I have says that the door is
>> operated by springs, so perhaps the gravity vector change will not change
>> the operation of the sensor? 
>> 
>> A 10 minute run of the engine varying the throttle seems to indicate that
>> this is ok, but I want to get opinions from those who know the BOSCH system
>> on if this is risky.
>> 
>> Thanks for the help.
>> - -Mike
>> 
>
>       Carefully remove the black plastic cover from the air flow meter and I 
>think you will see how it work.  You can glue it back with silicone sealer.  
>There is a spring the controls opening of the air flow flap.  I have 
>occasionally moved the spring five notches on its attachment point.  The 
>theory is that this tricks the engine into thinking the air flow is greater 
>than it is and the computer will make the mixture a bit richer.
>       As far as mounting the meter on its side, I am not sure.  I do not 
>have a meter here in the garage to study.  I do have a couple in my storage 
>building that I could check later.
>       Now, why not just mount your meter horizontally as Alfa fitted it.  
>Then make a box out of aluminum or some material that will not melt.  Seal 
>the box to the fender and against the hood and have the front at the opening 
>beside the radiator.  This will move the cold air to the air cleaner and may 
>give a bit of ram air effect if it is sealed well.
>       Or move the air cleaner up to behind the grill and get a some hose to 
>duct the air from the air cleaner to the air flow meter.  Not quite what IAP 
>designed, but it should work.  Appropriate tubing is available in the 
>plumbing and heating section of your local hardware / home store.  Or get 
>some high tech stuff from Pegasus http://www.pegasusautoracing.com/, or from 
>Racer Wholesale http://www.racerpartswholesale.com/
>
>Ciao,
>Russ Neely
>Oklahoma City
>
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