Subject: Re: [Fot] Weber tuning help please

From: MadMarx via Fot <[email-masked]>
Date: Mon, 4 May 2015 11:21:53 +0200

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Jim,

=20

If one idle screw doesn=92t react I found in most cases that the =
throttle
shaft is tilted.

That means maybe throttle #3 is not open.

You can verify this with a synchron tester.

=20

Cheers

Chris

=20

Von: Fot [mailto:[email-masked]] Im Auftrag von Jim Gray via =
Fot
Gesendet: Sonntag, 3. Mai 2015 20:40
An: [email-masked]
Betreff: [Fot] Weber tuning help please

=20

I just installed my webers and I=92m running into something not covered =
in
anything I=92ve read so far.

At cruise speed which I do on the street, 2500  -3000 RPM my exhaust gas
temps on # 4  are 100 plus degrees

over # 1and will climb to 1400 if I stay at that throttle setting. Under
wide open throttle they equalize and seem

to settle in at about 1300.

However, I think this may be symptomatic of my other issue. When I=92m =
tuning
the idle air screws, open them up until

it starts to miss & so on, I can get a predictable stumble from three =
out of
the four screws.

The screw on # 3 has no effect on the idle no matter how far I run it in =
or
out.

Also , when I put my syncrometers on #=92s 3 and 4 they are =
significantly
different.

I=92m not going to get my dyno tune before the first race in two weeks =
so I=92m
left to figure it out on my own for now.

Any help would be greatly appreciated,

Jim g

=20

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lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>Jim,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>If one idle screw doesn&#8217;t react I found in most cases that the =
throttle shaft is tilted.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>That means maybe throttle #3 is not open.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>You can verify this with a synchron tester.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>Cheers<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'>Chris<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span><=
/b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Fot [mailto:[email-masked]] <b>Im Auftrag von </b>Jim Gray =
via Fot<br><b>Gesendet:</b> Sonntag, 3. Mai 2015 20:40<br><b>An:</b> =
[email-masked]<br><b>Betreff:</b> [Fot] Weber tuning help =
please<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>I just =
installed my webers and I&#8217;m running into something not covered in =
anything I&#8217;ve read so far.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>At cruise =
speed which I do on the street, 2500&nbsp; -3000 RPM my exhaust gas =
temps on # 4 &nbsp;are 100 plus degrees<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>over # 1and =
will climb to 1400 if I stay at that throttle setting. Under wide open =
throttle they equalize and seem<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>to settle in =
at about 1300.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>However, I =
think this may be symptomatic of my other issue. When I&#8217;m tuning =
the idle air screws, open them up until<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>it starts to =
miss &amp; so on, I can get a predictable stumble from three out of the =
four screws.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>The screw on =
# 3 has no effect on the idle no matter how far I run it in or =
out.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Also , when =
I put my syncrometers on #&#8217;s 3 and 4 they are significantly =
different.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>I&#8217;m =
not going to get my dyno tune before the first race in two weeks so =
I&#8217;m left to figure it out on my own for =
now.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Any help =
would be greatly appreciated,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Jim =
g<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
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width=3D627 height=3D627 id=3D"_x0000_i1025" =
src=3D"cid:[email-masked]"><o:p></o:p></span></p></div></=
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---

From: Mark J Bradakis via Fot <[email-masked]>
Date: Tue, 05 May 2015 00:10:34 -0600

MadMarx via Fot wrote:
> Jim,
>
> If one idle screw doesn’t react I found in most cases that the throttle shaft is tilted.

One issue that I have seen a time or two over the years is having return springs on the opposite
side of the throttle linkage. This generates torque which over time can twist the shaft so that
the throttle plates are no longer in the same plane - that is, one is closed and the other is not
quite closed.

mjb.

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