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Date: Wed, 27 Apr 2011 22:02:18 -0400
Message-ID: <BANLkTi=1YC52suBoqUHMKW-rX6BUnR5Svw@mail.gmail.com>
Subject: Re: [FlyRotary] Bad pressure sender?
From: Tracy <rwstracy@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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I assume you are talking about the stock RX-7 Oil pres. sender.   If so,
give up.  It's a fake pressure gauge in the car like many others these
days.  If there is any pressure above a certain level, it gives you a
mid-scale reading.

Use a real pressure sender.

Tracy

On Wed, Apr 27, 2011 at 9:11 PM, Ernest Christley <echristley@nc.rr.com>wrote:

> I'm not sure that I'm doing this right.  I don't want to buy, and then
> crowd my panel with, separate gauges for oil temp and pressure, so I've
> decided to wire them into my MegaSquirt.  The upside is that will enable me
> to log them.  To do this, I need resistance curves for the sensors.
>
> The temp was no problem.  Measure it at room temp, after it has been in
> some ice water for a while, and then boil it for a while.
>
> The pressure sender, I finally settled on just connecting it to my air
> compressor while varying the pressure.  At ambient, I got an open circuit.
>  Opened the regulator up to 30psi, and I got 39 ohms.  Then it stayed at 39
> ohms, all the way up to 100psi.
>
> I don't think this is the way the pressure regulator is supposed to work,
> but I'm willing to be corrected if I'm wrong.  Should I just order a
> pressure sender?
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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I assume you are talking about the stock RX-7 Oil pres. sender.=A0=A0 If so=
, give up.=A0 It&#39;s a fake pressure gauge in the car like many others th=
ese days.=A0 If there is any pressure above a certain level, it gives you a=
 mid-scale reading.<br>
<br>Use a real pressure sender.<br><br>Tracy<br><br><div class=3D"gmail_quo=
te">On Wed, Apr 27, 2011 at 9:11 PM, Ernest Christley <span dir=3D"ltr">&lt=
;<a href=3D"mailto:echristley@nc.rr.com">echristley@nc.rr.com</a>&gt;</span=
> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;">I&#39;m not sure that I&#39;m doing this ri=
ght. =A0I don&#39;t want to buy, and then crowd my panel with, separate gau=
ges for oil temp and pressure, so I&#39;ve decided to wire them into my Meg=
aSquirt. =A0The upside is that will enable me to log them. =A0To do this, I=
 need resistance curves for the sensors.<br>

<br>
The temp was no problem. =A0Measure it at room temp, after it has been in s=
ome ice water for a while, and then boil it for a while.<br>
<br>
The pressure sender, I finally settled on just connecting it to my air comp=
ressor while varying the pressure. =A0At ambient, I got an open circuit. =
=A0Opened the regulator up to 30psi, and I got 39 ohms. =A0Then it stayed a=
t 39 ohms, all the way up to 100psi.<br>

<br>
I don&#39;t think this is the way the pressure regulator is supposed to wor=
k, but I&#39;m willing to be corrected if I&#39;m wrong. =A0Should I just o=
rder a pressure sender?<br><font color=3D"#888888">
<br>
--<br>
Homepage: =A0<a href=3D"http://www.flyrotary.com/" target=3D"_blank">http:/=
/www.flyrotary.com/</a><br>
Archive and UnSub: =A0 <a href=3D"http://mail.lancaironline.net:81/lists/fl=
yrotary/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists=
/flyrotary/List.html</a><br>
</font></blockquote></div><br><div style=3D"visibility: hidden; left: -5000=
px; position: absolute; z-index: 9999; padding: 0px; margin-left: 0px; marg=
in-top: 0px; overflow: hidden; word-wrap: break-word; color: black; font-si=
ze: 10px; text-align: left; line-height: 130%;" id=3D"avg_ls_inline_popup">
</div>

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