plug readings vs electronics
Bruce
nacelp at bright.net
Thu Oct 11 02:41:48 GMT 2001
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Not quite.
You can tune and go too high in EGT, and make lots of HP just before the =
engine fails. EGT is just an indicator of what your running in =
relationship to the thermal limits of your engine.
If you EGT Probe is within 1.5" of your exhaust valve, and you see =
2100dF, your in serious trouble (unless using lots of barrier coatings, =
and exotic metals). Thou you may see some really nice HP for a few =
seconds. 2000dF at the turbine (sustained), will generally crystillize =
it.
Bruce
----- Original Message -----=20
From: Jason Mauldin=20
To: diy_efi at diy-efi.org=20
Sent: Wednesday, October 10, 2001 10:30 PM
Subject: Re: plug readings vs electronics
Actually, to carry this farther, EGT should only be used as a =
monitoring device AFTER getting the engine tuned on a dyno and =
determining what temperature your specific engine runs at. Otherwise =
you could get a baseline of what it normally runs at, and then =
monitoring for variances in temp to detect problems, but other than that =
it's really difficult to use one by itself for engine tuning. Unlike =
popular belief temperatures will rise if the mixture is too rich or =
lean, in addition to if you're knocking.=20
=20
Bruce <nacelp at bright.net> wrote:=20
Startin to look like all this may vary some by application, which is =
what my point was. While one might state what is true for his =
application, doesn't make it a universal statement.
EGT is nothiing more then a tuning tool, and you need to learn what =
the magic numbers are for various applications. =20
Bruce
----- Original Message -----=20
From: Jason Mauldin=20
To: diy_efi at diy-efi.org=20
Sent: Wednesday, October 10, 2001 9:24 PM
Subject: Re: plug readings vs electronics
My talon had a temp of aroun 1500F. This was about 6" from the =
head.=20
TwoLnBlktp90 at aol.com wrote:=20
temps will go up very quickly when you are starting to detonate, =
letting you know you need to back off a little bit.=20
I'm not sure if the temp is universal, but for my DSM its =
somewhere around 1280F, this is of course affected by how far from the =
head the probe is set.=20
You can also get a data logger that will tell you the knock =
count.=20
Ricky=20
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<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Not quite.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>You can tune and go too high in EGT, =
and make lots=20
of HP just before the engine fails. EGT is just an indicator =
of what=20
your running in relationship to the thermal limits of your =
engine.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>If you EGT Probe is within 1.5" of your =
exhaust=20
valve, and you see 2100dF, your in serious trouble (unless using lots of =
barrier=20
coatings, and exotic metals). Thou you may see some really nice HP =
for a=20
few seconds. 2000dF at the turbine (sustained), will =
generally=20
crystillize it.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Bruce</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Djmauld at yahoo.com href=3D"mailto:jmauld at yahoo.com">Jason =
Mauldin</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, October 10, =
2001 10:30=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: plug readings vs=20
electronics</DIV>
<DIV><BR></DIV>
<P>Actually, to carry this farther, EGT should only be used as a =
monitoring=20
device AFTER getting the engine tuned on a dyno and determining what=20
temperature your specific engine runs at. Otherwise you could =
get a=20
baseline of what it normally runs at, and then monitoring for =
variances in=20
temp to detect problems, but other than that it's really difficult to =
use one=20
by itself for engine tuning. Unlike popular belief temperatures =
will=20
rise if the mixture is too rich or lean, in addition to if you're =
knocking.=20
<P>=20
<P> <B><I>Bruce <nacelp at bright.net></I></B> wrote:=20
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px =
solid">
<META content=3D"MSHTML 5.50.4616.200" name=3DGENERATOR>
<STYLE></STYLE>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Startin to look like all this may =
vary some by=20
application, which is what my point was. While one might =
state=20
what is true for his application, doesn't make it a universal=20
statement.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>EGT is nothiing more then a tuning =
tool, and=20
you need to learn what the magic numbers are for various =
applications. =20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Bruce</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Djmauld at yahoo.com href=3D"mailto:jmauld at yahoo.com">Jason =
Mauldin</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, October =
10, 2001=20
9:24 PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: plug readings =
vs=20
electronics</DIV>
<DIV><BR></DIV>
<P>My talon had a temp of aroun 1500F. This was about 6" =
from the=20
head.=20
<P> <B><I><A=20
=
href=3D"mailto:TwoLnBlktp90 at aol.com">TwoLnBlktp90 at aol.com</A></I></B> =
wrote:=20
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff =
2px solid"><FONT=20
face=3Darial,helvetica><FONT size=3D2>temps will go up very =
quickly when you=20
are starting to detonate, letting you know you need to back off =
a little=20
bit. <BR><BR>I'm not sure if the temp is universal, but for my =
DSM its=20
somewhere around 1280F, this is of course affected by how far =
from the=20
head the probe is set. <BR><BR>You can also get a data logger =
that will=20
tell you the knock count. <BR><BR>Ricky</FONT> =
</BLOCKQUOTE></FONT>
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