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If all else fail check your fuel pump for sufficient delivery. I can't
remember for sure but believe a free-flowing SU is supposed to pump a
gallon in a minute, but I'm sure someone will correct me if I am wrong.
Best--Michael Oritt
On Fri, Jan 29, 2021 at 9:14 AM healeyguy--- via Healeys <
healeys@autox.team.net> wrote:
> Len and Listers
> Pushing the pin up to lift the piston is the start of the "test the
> mixture setting" exercise. You begin the push, ever so slightly, and
> listen to the idling engine. The idle goes up. What do you do next? You
> continue to raise the pin to see what happens. If the idle continues to
> rise you know you are in a rich condition. If the idle stops going up and
> starts to drop off the mixture is pretty close. If the idle does not
> increase from the start you usually assume you are in a lean condition.
> This gets the carb mixture close at idle which in theory means the carb i=
s
> going to operate throughout the RPM range.
>
> There is one other assumption here, that being that the carbs is in the
> same condition as new mounted on an engine operating as new. That is when
> allot of other stuff comes into play. The carb float bowl items,
> needle/seat and float level must be set correctly. Float must not be
> leaking thus making it sink. Carb must have the correct main needle and j=
et
> and they have to be installed and adjusted correctly. Flutter at high RPM
> may indicate that the piston spring in the suction chamber is weak or the
> incorrect spring installed. Ignition timing and condition and setting of
> ignition points.
> The list goes on and on......
> P
>
>
> -----Original Message-----
> From: Leonard Berkowitz <DrBerkowitz@hotmail.com>
> Subject: [Healeys] Another backfiring question
>
> Hi all
>
> Just finished repairing and reinstalling the carburetors on my BJ7. I
> thought I had everything adjusted properly. According to my Haynes Manuel
> the engine speed should increase slightly when you lift the piston a very
> small amount. Mine does that. My dwell angle is where it needs to be and
> the car starts and idles nicely. Also sounds beautiful when I punch the
> accelerator linkages. The problem is that when I get it up to 60-70 mph I
> get what sounds like backfiring into my carburetors. Also sounds like it
> doesn=E2=80=99t have a whole lot left in the tank, so to speak. Does that=
sound
> like I am running too rich or too lean?
>
> Len Berkowitz
>
>
> _______________________________________________
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>
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">If al=
l else fail check your fuel pump for sufficient delivery.=C2=A0 I can't=
remember for sure but believe a free-flowing SU is supposed to pump a gall=
on in a minute, but I'm sure someone will correct me if I am wrong.</di=
v><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div class=
=3D"gmail_default" style=3D"color:#3333ff">Best--Michael Oritt</div><div cl=
ass=3D"gmail_default" style=3D"color:#3333ff"><br></div><div class=3D"gmail=
_default" style=3D"color:#3333ff"><br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jan 29, 2021 at 9:14 AM=
healeyguy--- via Healeys <<a href=3D"mailto:healeys@autox.team.net";>hea=
leys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex">
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">
<div id=3D"gmail-m_-8405075880273479824yiv9115048286">
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">Len and Lis=
ters</div>
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">Pushing the=
pin up to lift the piston is the start of the "test the mixture setti=
ng" exercise. You begin the push, ever so slightly,=C2=A0 and listen t=
o the idling engine. The idle goes up.=C2=A0 What do you do next? You conti=
nue to raise the pin=C2=A0 to see what happens. If the idle continues to ri=
se you know you are in a rich condition. If the idle stops going up and sta=
rts to drop off the mixture is pretty close. If the idle does not increase =
from the start you usually assume you are in a lean condition.=C2=A0 This g=
ets the carb mixture close at idle which in theory means the carb is going =
to operate throughout the RPM range.=C2=A0=C2=A0</div>
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif"><br>
</div>
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">There is on=
e other assumption here, that being that the carbs is in the same condition=
as new mounted on an engine operating as new. That is when allot of other =
stuff comes into play.=C2=A0 The carb float bowl items, needle/seat and flo=
at level=C2=A0 must be set correctly. Float must not be leaking thus making=
it sink. Carb must have the correct main needle and jet and they have to b=
e installed and adjusted correctly.=C2=A0<span style=3D"font-size:10pt;back=
ground-color:transparent">Flutter at high RPM may indicate that the piston =
spring in the suction chamber is weak or the incorrect spring installed. Ig=
nition timing and condition and setting of ignition points.</span></div>
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">The list go=
es on and on......</div>
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">P<br clear=
=3D"none">
<br clear=3D"none">
<br clear=3D"none">
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br clear=3D"none">
From: Leonard Berkowitz <<a href=3D"mailto:DrBerkowitz@hotmail.com"; targ=
et=3D"_blank">DrBerkowitz@hotmail.com</a>><br clear=3D"none">Subject: [H=
ealeys] Another backfiring question<br clear=3D"none">
<br clear=3D"none">
<div id=3D"gmail-m_-8405075880273479824yiv9115048286yqt58392">
<div id=3D"gmail-m_-8405075880273479824yiv9115048286">
=20
<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
Hi all</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
<br clear=3D"none">
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
Just finished repairing and reinstalling the carburetors on my BJ7. I thoug=
ht I had everything adjusted properly. According to my Haynes Manuel the en=
gine speed should increase slightly when you lift the piston a very small a=
mount. Mine does that.=C2=A0 My dwell
angle is where it needs to be and the car starts and idles nicely. Also so=
unds beautiful when I punch the accelerator linkages. The problem is that w=
hen I get it up to 60-70 mph I get what sounds like backfiring into my carb=
uretors. Also sounds like it doesn=E2=80=99t
have a whole lot left in the tank, so to speak. Does that sound like I am =
running too rich or too lean?=C2=A0</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
<br clear=3D"none">
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0)">
Len Berkowitz=C2=A0</div>
</div>
</div>
</div>
<br>
<br clear=3D"none">
</div>
</div>
</div>
</div>
</div>
_______________________________________________<br>
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Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
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ttp://autox.team.net/archive" rel=3D"noreferrer" target=3D"_blank">http://a=
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</blockquote></div>
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