Subject: Re: [Healeys] Backfiring thru the carbs

From: Hank Leach via Healeys <[email-masked]>
Date: Sat, 27 Sep 2025 18:39:54 +0000 OOHwaYD9ie/G/egMBij5pdJ5OB+tOuHgoYu4thuJpruELbb/zH+MS5sZNmQBLzr4bJiX7BvUsLg3ZwTAvrMkG2zh/R+eUOm4Ap3iS3oeh8pHmJ6/P/4DxiqR oyNJTRTc3K1Uf1/CxUsRhA==

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<div>Car sitting-suspect moisture got into condenser in distributor and =
that will cause the condition you describe at low speed. =
Hank<br>-------------------- <br><br>From: "Per Schoerner" =
&lt;[email-masked]&gt; <br>To: &lt;[email-masked]&gt; <br>Cc: "AH =
Mail List" &lt;[email-masked]&gt; <br>Sent: September 27, 2025 at =
10:42 AM PDT <br>Subject: Re: [Healeys] Backfiring thru the carbs <br>Top =
up the vacuum chambers in the carburettors.</div>
<div>&nbsp;</div>
<div>Per&nbsp;</div>
<div><br id=3D"lineBreakAtBeginningOfSignature">
<div>Skickat fr&aring;n min iPhone</div>
<div><br>
<blockquote>27 sep. 2025=
 kl. 18:06 skrev warthodson--- via Healeys &lt;[email-masked].=
net&gt;:<br><br></blockquote>
</div>
<blockquote>
<div>
<div class=3D"ydp74f56c47yahoo-style-wrap" style=3D"font-family: Comic Sans=
 MS, sans-serif; font-size: 16px;">
<div>&nbsp;</div>
<div>The car has sat dormant for many years. It has not been driven for =
many years &amp; is in rough condition. It has had the engine rebuilt, but =
I do not have any info about what was done.&nbsp;</div>
<div>Gary</div>
<div>&nbsp;</div>
</div>
<div id=3D"ydp7fffbbe5yahoo_quoted_9272768480" =
class=3D"ydp7fffbbe5yahoo_quoted">
<div class=3D"ydp7fffbbe5yahoo-style-wra=
p" style=3D"font-family: Comic Sans MS, sans-serif; font-size: 16px;">
<div style=3D"font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; =
font-size: 13px; color: #26282a;">
<div class=3D"ydp7fffbbe5quoted-text-hea=
der">On Thursday, September 25, 2025 at 06:22:07 PM CDT, Al Fuller =
&lt;[email-masked]&gt; wrote:</div>
</div>
<div =
class=3D"ydp7fffbbe5inline_reply_quote_container" style=3D"font-family: =
'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 13px; color: =
#26282a; border-left: 1px solid #ccc; padding-left: 8px; margin: 0px 0px =
0px 8px;">
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>
<div id=3D"ydp7fffbbe5yiv2496041686">
<div>
<div>
<div>Gary, I'd echo what =
Harold asked:&nbsp; What was changed before the car started acting up? Or, =
did it appear to start backfiring spontaneously?</div>
<div>&nbsp;</div>
<div>Often the issue is "maintenance induced".</div>
<div>&nbsp;</div>
<div>________________<br>Sent from my phone <br>Best Regards,<br>Al =
Fuller</div>
</div>
<br>
<div class=3D"ydp7fffbbe5yiv2496041686gmail_quote =
ydp7fffbbe5yiv2496041686gmail_quote_container">
<div =
class=3D"ydp7fffbbe5yiv2496041686gmail_attr">On Fri, Sep 26, 2025, =
6:57=E2=80=AFAM Harold Manifold &lt;<a href=3D"mailto:[email-masked]" =
target=3D"_blank" rel=3D"noopener">[email-masked]</a>&gt; wrote:</div>
<blockquote class=3D"ydp7fffbbe5yiv2496041686gmail_quote" style=3D"margin: =
0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;">
<div>At what throttle position does the backfiring occur? One =
possible&nbsp;cause is the timing is too far advanced. Are you able to =
check the&nbsp;timing at the point of backfire? Has any work to the valve =
train been done prior to the backfiring? I would suggest resetting&nbsp;all=
 of the valve clearances.
<div>Harold</div>
</div>
<br>
<div class=3D"ydp7fffbbe5yiv2496041686gmail_quote">
<div class=3D"ydp7fffbbe5yiv2496041686gmail_attr">On Thu, Sep 25, 2025 at =
2:21=E2=80=AFPM warthodson--- via Healeys &lt;<a href=3D"mailto:healeys@aut=
ox.team.net" target=3D"_blank" rel=3D"noopener">[email-masked].=
net</a>&gt; wrote:</div>
<blockquote class=3D"ydp7fffbbe5yiv2496041686gmail=
_quote" style=3D"margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204,=
204,204); padding-left: 1ex;">
<div>
<div style=3D"font-family: Sans =
sans-serif; font-size: 16px;">
<div>A club member's BJ8 is backfiring thru =
the carbs, HD8's. We have adjusted the timing &amp; enrichened the carbs. I=
 plan to revisit both of those settings. What else might be causing this?=
</div>
<div>Thanks,</div>
<div>Gary H.&nbsp;</div>
</div>
</div>
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From: Craig Cooper <[email-masked]>
Date: Sat, 27 Sep 2025 18:30:32 -0700

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How about a big vacuum leak?  It's noted the car here hasn't run for a long
time.  Could be worth checking the vacuum line from the manifold to the
brake booster.  Might be worth checking.  Where does the vacuum to the
booster on a BJ8 come from?

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-size:large">How about a big vacuum leak?=C2=A0 It&#39;s noted the car her=
e hasn&#39;t run for a long time.=C2=A0 Could be worth checking the vacuum =
line from the manifold to the brake booster.=C2=A0 Might be worth checking.=
=C2=A0 Where does the vacuum to the booster on a BJ8 come from?=C2=A0</div>=
</div>
</div>

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[email-masked]

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From: Hank Leach via Healeys <[email-masked]>
Date: Sun, 28 Sep 2025 01:53:11 +0000 Ql28ncfQPC2C3yrDoK6KJiJGP1jIcPyYJbHHziQP5wyBdpkKzM/wiPcR0ZvJZk3/JIcChzA11CmWB5OpY/6r+CafSYivmomdMXln00au2+SrYGAuKdqP9Gr3

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<div>Oh yea, speaking of vacuums-check the vacuum diaphragm on the =
distributor-could be hard as a rock. Prevents advance. =
Hank<br>-------------------- <br><br>From: "Craig Cooper" =
&lt;[email-masked]&gt; <br>To: &lt;[email-masked]&gt; =
<br>Sent: September 27, 2025 at 6:47 PM PDT <br>Subject: Re: [Healeys] =
Backfiring thru the carbs </div>
<div>
<div>
<div class=3D"gmail_default" =
style=3D"font-size: large;">How about a big vacuum leak?&nbsp; It's noted =
the car here hasn't run for a long time.&nbsp; Could be worth checking the =
vacuum line from the manifold to the brake booster.&nbsp; Might be worth =
checking.&nbsp; Where does the vacuum to the booster on a BJ8 come from?=
&nbsp;</div>
</div>
</div>
<div>&nbsp;</div>

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[email-masked]

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From: Jake V <[email-masked]>
Date: Sat, 27 Sep 2025 21:54:35 -0400

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The booster vacuum take off is on the aft end of the intake manifold.
I had similar issues right when I started up my BJ8 project for the first
time. Turns out I had swapped #2 and #4 plug wires in the cap when I made
new ones.
Swapped them to correct, the car fires right up and idles beautifully, no
backfiring at all thru the carbs.
I had reset the valves and adjusted the timing by ear to a few degrees
advanced.
Jake

On Sat, Sep 27, 2025, 9:46 PM Craig Cooper <[email-masked]> wrote:

> How about a big vacuum leak?  It's noted the car here hasn't run for a
> long time.  Could be worth checking the vacuum line from the manifold to
> the brake booster.  Might be worth checking.  Where does the vacuum to the
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
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> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
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<div dir=3D"auto">The booster vacuum take off is on the aft end of the inta=
ke manifold.<div dir=3D"auto">I had similar issues right when I started up =
my BJ8 project for the first time. Turns out I had swapped #2 and #4 plug w=
ires in the cap when I made new ones.</div><div dir=3D"auto">Swapped them t=
o correct, the car fires right up and idles beautifully, no backfiring at a=
ll thru the carbs.</div><div dir=3D"auto">I had reset the valves and adjust=
ed the timing by ear to a few degrees advanced.</div><div dir=3D"auto">Jake=
</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sat, Sep 27, 2025, 9:46 PM Craig Cooper &l=
t;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div dir=3D=
"ltr"><div class=3D"gmail_default" style=3D"font-size:large">How about a bi=
g vacuum leak?=C2=A0 It&#39;s noted the car here hasn&#39;t run for a long =
time.=C2=A0 Could be worth checking the vacuum line from the manifold to th=
e brake booster.=C2=A0 Might be worth checking.=C2=A0 Where does the vacuum=
 to the booster on a BJ8 come from?=C2=A0</div></div>
</div>
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