[Diy_efi] Exhaust manifold pressure sensors

John Gross jogross3
Mon Apr 25 13:31:14 UTC 2005


If you do that, you're going to get a lot of noise in the data, as the 
pressure waves in the tube will be interfering with one another.

Why do you want to log this?  Do you have some baseline that you're trying 
to compare it to?

FWIW, most pressure transducers that could withstand sustained temps in the 
1200-1300 deg F range are going to be peizo-crystal sensors, which are very 
expensive and very hard to deal with (i.e. far worse than WBO2).  
In-cylinder pressure sensors are peizo-crystal, and tend to run anywhere 
from $1k - $3k per sensor.  These sensors are relative pressure transducers, 
not absolute, which means they need to be re-referenced to atmosphere 
regularly (in-cylinder pressure sensors are usually re-ref'd every engine 
cycle).  I do not know of any pressure sensors that would take that 
sustained heat, but then again, the only time I need to see pressure when 
it's that hot is inside the cylinder, and peizo-crystal is the way to go on 
those.  Also, keep in mind your pressure is going to be fairly low (probably 
no more than 2 bar absolute), and most peizo-crystal pressure sensors have 
very large ranges (i.e. 0-100 bar or more), so your resolution is not going 
to be good at all.

John

>From: "Gianmarco Rizzo (BE/EAS)" <gianmarco.rizzo at ericsson.com>
>Reply-To: diy_efi at diy-efi.org
>To: "'Chris Wilson'" 
><chris at formula3.freeserve.co.uk>,"'diy_efi at diy-efi.org'" 
><diy_efi at diy-efi.org>
>Subject: RE: [Diy_efi] Exhaust manifold pressure sensors
>Date: Mon, 25 Apr 2005 11:04:06 +0200
>
>i think the way is to use a long (10 ft) copper pipe so gases have time to 
>cool down
>
> > -----Original Message-----
> > From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> > Sent: Montag, 25. April 2005 10:54
> > To: diy_efi at diy-efi.org
> > Subject: [Diy_efi] Exhaust manifold pressure sensors
> >
> >
> >
> > I want to data log exhaust manifold pressures pre the turbo
> > on a boosted 4
> > stroke engine. Who makes a suitable pressure sensor, or do I need to
> > pipe a remote one up to get the sensor away from the heat?
> >
> > Thanks.
> >
> > --
> > Best regards,
> >            Chris Wilson
> >                       http://www.formula3.freeserve.co.uk
> >
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> >
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