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Message-ID: <1c23473f050905113930ab8f19@mail.gmail.com>
Date: Mon, 5 Sep 2005 11:39:41 -0700
From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Another great flying day = another day of troubleshooting
In-Reply-To: <list-711824@logan.com>
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Ed I am talking MAP in both cases. I don't see how 26" MAP is higher than=
=20
36"MAP. But I learned the old math :-)
 Dave

 On 9/5/05, Ed Anderson <eanderson@carolina.rr.com> wrote:=20
>=20
> Well, actually it is absolute pressure that the spark plug is reacting to=
.=20
> In this example, the absolute pressure in the intake is 1.234" HG higher=
=20
> at 10,000 with your 26 " boost than at sea level with your 36" of boost..=
=20
> This would contribute to an increased pressure in the combustion chamber=
=20
> when it is compressed over the sea level compression pressure. Therefore,=
=20
> the spark plug is facing a tougher task at 10,000 than at Sea level (in t=
his=20
> example).
>  Ed
>=20
> ----- Original Message -----=20
> *From:* David Leonard <wdleonard@gmail.com>=20
> *To:* Rotary motors in aircraft <flyrotary@lancaironline.net>=20
>  *Sent:* Monday, September 05, 2005 12:57 PM
> *Subject:* [FlyRotary] Re: Another great flying day =3D another day of=20
> troubleshooting
>=20
>    Actually, Dave you had a higher pressure ratio (manifold to ambient) a=
t=20
> > 10,000 feet with 26" boost than at sea level with 36". At sea level the=
=20
> > pressure ratio would be 36/29.92 =3D 1.20. At 10,000 ft ambient pressur=
e =3D=20
> > 20.57 " hg , so the pressure ratio would be 26/20.57 =3D 1.26. Not much=
=20
> > greater, but it was higher by approx.1.23" Hg. (1.20 -1.26 =3D .06 *20.=
57=3D=20
> > 1.234" Hg).=20
> >=20
> > Ed A
> >=20
> > Right. But what does the plug know about the ambient pressure? I though=
t=20
> that it was just the absolute density of the charge that was contributing=
 to=20
> SAG.=20
>=20
> --=20
> Dave Leonard
> Turbo Rotary RV-6 N4VY
> http://members.aol.com/_ht_a/rotaryroster/index.html
> http://members.aol.com/_ht_a/vp4skydoc/index.html=20
>=20
>=20


--=20
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html

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<div>Ed I am talking MAP in both cases.&nbsp; I don't see how 26&quot; MAP =
is higher than 36&quot;MAP.&nbsp; But I learned the old math&nbsp; :-)</div=
>
<div>&nbsp;</div>
<div>Dave<br><br>&nbsp;</div>
<div><span class=3D"gmail_quote">On 9/5/05, <b class=3D"gmail_sendername">E=
d Anderson</b> &lt;<a href=3D"mailto:eanderson@carolina.rr.com">eanderson@c=
arolina.rr.com</a>&gt; wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div><font face=3D"Arial">Well, actually it is absolute pressure that the s=
park plug is reacting to.&nbsp; In this example, the absolute pressure in t=
he intake is 1.234&quot; HG higher at 10,000 with your 26 &quot; boost than=
 at sea level with your 36&quot; of boost..&nbsp; This would contribute to =
an increased pressure in the combustion chamber when it is compressed over =
the sea level compression pressure.&nbsp; Therefore, the spark plug is faci=
ng a tougher task at 10,000 than at Sea level (in this example).
</font></div><span class=3D"sg">
<div><font face=3D"Arial"></font>&nbsp;</div>
<div><font face=3D"Arial">Ed</font></div></span>
<blockquote style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5p=
x; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"><span class=3D"q">
<div style=3D"FONT: 10pt arial">----- Original Message ----- </div>
<div style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial"><b>From:</b> <a title=
=3D"wdleonard@gmail.com" onclick=3D"return top.js.OpenExtLink(window,event,=
this)" href=3D"mailto:wdleonard@gmail.com" target=3D"_blank">David Leonard<=
/a> </div>

<div style=3D"FONT: 10pt arial"><b>To:</b> <a title=3D"flyrotary@lancaironl=
ine.net" onclick=3D"return top.js.OpenExtLink(window,event,this)" href=3D"m=
ailto:flyrotary@lancaironline.net" target=3D"_blank">Rotary motors in aircr=
aft</a>
 </div></span>
<div><span class=3D"e" id=3D"q_1062743b0ab9a901_4">
<div style=3D"FONT: 10pt arial"><b>Sent:</b> Monday, September 05, 2005 12:=
57 PM</div>
<div style=3D"FONT: 10pt arial"><b>Subject:</b> [FlyRotary] Re: Another gre=
at flying day =3D another day of troubleshooting</div>
<div><br>&nbsp;</div>
<div>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<blockquote dir=3D"ltr" style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MAR=
GIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<p>&nbsp;Actually, Dave you had a higher pressure ratio (manifold to ambien=
t) at 10,000 feet with 26&quot; boost than at sea level with 36&quot;.&nbsp=
; At sea level the pressure ratio would be 36/29.92 =3D 1.20.&nbsp; At 10,0=
00 ft ambient pressure =3D=20
20.57 &quot; hg , so the pressure ratio&nbsp;would&nbsp;&nbsp;be&nbsp;26/20=
.57 =3D 1.26.&nbsp; Not much greater, but it was higher by approx.1.23&quot=
; Hg. (1.20 -1.26 =3D .06 *20.57 =3D 1.234&quot; Hg). </p>
<p><font face=3D"Arial">Ed A</font></p></blockquote></blockquote></div>Righ=
t.&nbsp; But what does the plug know about the ambient pressure?&nbsp; I th=
ought that it was just the absolute density of the charge that was contribu=
ting to SAG.=20
<br><br>-- <br>Dave Leonard<br>Turbo Rotary RV-6 N4VY<br><a onclick=3D"retu=
rn top.js.OpenExtLink(window,event,this)" href=3D"http://members.aol.com/_h=
t_a/rotaryroster/index.html" target=3D"_blank">http://members.aol.com/_ht_a=
/rotaryroster/index.html
</a><br><a onclick=3D"return top.js.OpenExtLink(window,event,this)" href=3D=
"http://members.aol.com/_ht_a/vp4skydoc/index.html" target=3D"_blank">http:=
//members.aol.com/_ht_a/vp4skydoc/index.html</a> </span></div></blockquote>=
</blockquote>
</div><br><br clear=3D"all"><br>-- <br>Dave Leonard<br>Turbo Rotary RV-6 N4=
VY<br><a href=3D"http://members.aol.com/_ht_a/rotaryroster/index.html">http=
://members.aol.com/_ht_a/rotaryroster/index.html</a><br><a href=3D"http://m=
embers.aol.com/_ht_a/vp4skydoc/index.html">
http://members.aol.com/_ht_a/vp4skydoc/index.html</a>=20

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