----- Original Message -----

From: Michael Rigby-Jones

To: PICLIST@MITVMA.MIT.EDU

Sent: Wednesday, February 16, 2000 8:18 AM

Subject: Re: Air pressure sensors [OT]

Wagner, they exist.  I have a friend that did a lot of research on Exhaust Gas Recirculation on big diesel engines in submarines, and they used some very impressive kit to measure the P-V (pressure/volume) curves to calculate efficiency etc.  The sensors were very, very expensive.  It's tricky getting good pressure calibration at those temperatures :o)

Mike

Would you love to be able to measure the pressure inside the cylinder at
the exact moment of the combustion?... there are some 5000PSI pressure
sensors aroud... :)
Wagner.

Tom Handley wrote:
>
>    John, I have no experience in that area. What is the highest pressure you
> want to measure? A typical sensor used for a barometer is 15 PSIA. Most all
> sensors are tested at an overpressure of at least twice their range.
> Motorola makes a sensor, MAP (Manifold Absolute Pressure), for engine
> control applications but it's also great for barometers and altimeters. The
> device is the MPX4115A. It's normal range is around 2.2 to 16.7 PSIA with an
> overpressure rating of 58 PISA. It provides internal signal conditioning and
> runs off of +5V (5.1V nominal) with a full-scale span of around 4.6V. For
> more info:
>
>       http://mot-sps.com/products/sensors/
>
>    - Tom
>
> At 09:26 AM 2/12/00 -0800, John Pearson wrote:
> >Tom,
> >
> >Thanks for the offer to help.
> >
> >I want to add some electric blowers to the induction system of my drag race
> >car. I want to be able to ventilate the induction system to keep it cool
> >before racing, then add some air pressure, hopefully, to increase air flow
> >into the motor.
> >
> >I have a sketch on my web page: www.cmc.net/~xero. Sketch is called EEI.jpg
> >(Electricaly Enhanced Induction). This illustrates my current system except
> >I have added blowers where the induction system makes 90 degree turns into
> >the engine compartment. You can see the car at www.fordmuscle.com. Click on
> >the feature 'The Mouse'.
> >
> >I need to find a way to measure the minute amounts of pressure I hope to
> >create at low speeds, untill the system intakes can take over and force air
> >into the motor.
> >
> >I would like to recreate the effects of high barometric pressure, which
> >really increase power. What kind of pressure are we talking about with
> >barometric pressure.
> >
> >The Blowers are rated at cfm at certain static pressures. How does sp
> >relate to barometric pressure. Are they close in values?
> >
> >Anyway, I am dealing with a lot of unknowns here as you can see.
> >
> >Hope you can help me out a little.
> >
> >Thanks
> >John
>
> ------------------------------------------------------------------------
> Tom Handley
> New Age Communications
> Since '75 before "New Age" and no one around here is waiting for UFOs ;-)