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I dunno if it can cause high RPM backfiring (I think it could), but the
airflow on all (2-3) carbs has to be the same--or, at least, very
close--at all throttle positions. This has to be checked off-idle,
obviously, but if it's good at, say, 2,500RPM it should be good at all
speeds; if not, you have to disconnect the throttle connect shaft to set
them. I suppose a crack Brit-car mechanic can test with the recommended
'hose-in-the-ear' technique--my ear hose is collecting dust
somewhere--but I use a Uni-Syn.
To paraphrase the TV commercial we've all (probably) seen a thousand
times: "If you don't have a carburettor synchronizer, get one."
Bob
On 1/29/2021 6:13 AM, healeyguy--- via Healeys 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 is 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 jet 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. Â 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 doesnâ??t 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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I dunno if it can cause high RPM backfiring (I think it could), but
the airflow on all (2-3) carbs has to be the same--or, at least,
very close--at all throttle positions. This has to be checked
off-idle, obviously, but if it's good at, say, 2,500RPM it should be
good at all speeds; if not, you have to disconnect the throttle
connect shaft to set them. I suppose a crack Brit-car mechanic can
test with the recommended 'hose-in-the-ear' technique--my ear hose
is collecting dust somewhere--but I use a Uni-Syn.<br>
<br>
To paraphrase the TV commercial we've all (probably) seen a thousand
times: "If you don't have a carburettor synchronizer, get one."<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 1/29/2021 6:13 AM, healeyguy--- via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1753560953.193599.1611929637112@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div style="color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div
style="font-family:arial,helvetica;font-size:10pt;color:black">
<div id="yiv9115048286">
<div style="color:black;font:10pt Arial, Helvetica,
sans-serif;">Len and Listers</div>
<div style="color:black;font:10pt Arial, Helvetica,
sans-serif;">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 is going to operate
throughout the RPM range.  </div>
<div style="color:black;font:10pt Arial, Helvetica,
sans-serif;"><br>
</div>
<div style="color:black;font:10pt Arial, Helvetica,
sans-serif;">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 jet and they have to be
installed and adjusted correctly. <span style="font-size:
10pt; background-color: transparent;">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.</span></div>
<div style="color:black;font:10pt Arial, Helvetica,
sans-serif;">The list goes on and on......</div>
<div style="color:black;font:10pt Arial, Helvetica,
sans-serif;">P<br clear="none">
<br clear="none">
<br clear="none">
<div style="font-family:arial,
helvetica;font-size:10pt;color:black;">-----Original
Message-----<br clear="none">
From: Leonard Berkowitz <a class="moz-txt-link-rfc2396E"
href="mailto:DrBerkowitz@hotmail.com";><DrBerkowitz@hotmail.com></a><br
clear="none">
Subject: [Healeys] Another backfiring question<br
clear="none">
<br clear="none">
<div class="yiv9115048286yqt1338206923"
id="yiv9115048286yqt58392">
<div id="yiv9115048286">
<style type="text/css">#yiv9115048286 P
{margin-top:0;margin-bottom:0;}</style>
<div dir="ltr">
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
Hi all</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
<br clear="none">
</div>
<div style="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 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. Â 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 doesnâ??t have a whole lot left in the tank, so
to speak. Does that sound like I am running too
rich or too lean? </div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
<br clear="none">
</div>
<div style="font-family:Calibri, Helvetica,
sans-serif;font-size:12pt;color:rgb(0, 0, 0);">
Len Berkowitz </div>
</div>
</div>
</div>
<br>
<br clear="none">
</div>
</div>
</div>
</div>
</div>
<br>
</blockquote>
<br>
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