<VV> Re: MAP sensor - utlimately for a Corvair

[BBRT]

Jim, Thanks.
----- Original Message ----- 
From: "Jim Simpson" <simpsonj at bellatlantic.net>
To: <chsadek at comcast.net>
Cc: <virtualvairs at skiblack.com>
Sent: Thursday, October 25, 2007 5:06 PM
Subject: <VV> Re: MAP sensor - utlimately for a Corvair


> Hi Chuck -- the electronic pressure sensors come in several varieties but 
> in direct answer to your question, they can be either absolute pressure or 
> relative pressure.
>
> The absolute pressure ones are sealed during the manufacturing process and 
> do NOT have an external reference port, just the single pressure sensing 
> port.  You can use them a barometers if you'd like.  The relative pressure 
> ones do have a second external port.  If you want to sense relative to 
> atmospheric, just leave it open or if you want measure differential 
> pressures (say between the right and left cylinder bank), hook a line to 
> each port.  (Some relative pressure sensors don't have a second connection 
> port, just a vent hole.  Hooking them up for differential pressure is a 
> bit trickery but can be done.)
>
> For details, google the Motorola MPX series pressure sensors.  They come 
> in a variety of pressure ranges, sizes, and case styles.
>
> Jim Simpson
> Group Corvair (Instrumented '66 turbo w/ a Motorola absolute pressure 
> sensor.)
>
>