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Symptoms suggest fuel delivery (faulty pump, clogged filter, etc.).
What cap and wires are you running? If stranded wire secondaries they
could be affecting the Pertronix from RFI (the guys on Roadkill Garage
had that issue with an old Chevy dragster). The larger the plug gap the
more voltage produced at the plug electrodes (IMO 0.035 is pushing it
and not really necessary).
Bob
On 9/19/2025 2:36 PM, Richard Antal via Healeys wrote:
> Gents,
> Â Â Â A few days ago I replaced the sparkplugs, ten years old or more,
> with six NGK BP5ES plugs gapped to 35, and a Pertronix 3 ohm coil.
> I've not yet changed the wires, distributor cap or rotor. Today I
> drove the BJ8 almost 200 miles without incident at speeds up to 60
> mph. While going 80 mph on the interstate, over a span of two or three
> seconds, the car bucked and backfired three times. I immediately
> dropped the speed to 50 and then gradually back up to 80 with no
> further backfiring. What could have caused this discomfiting turn of
> events? Thanks for your thoughts.
> rich antal
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Symptoms suggest fuel delivery (faulty pump, clogged filter, etc.).<br>
<br>
What cap and wires are you running? If stranded wire secondaries
they could be affecting the Pertronix from RFI (the guys on Roadkill
Garage had that issue with an old Chevy dragster). The larger the
plug gap the more voltage produced at the plug electrodes (IMO 0.035
is pushing it and not really necessary).<br>
<br>
Bob <br>
<br>
<div class="moz-cite-prefix">On 9/19/2025 2:36 PM, Richard Antal via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:216678656.5668955.1758317819690@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="yahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">
<div dir="ltr" data-setdir="false">Gents,</div>
<div dir="ltr" data-setdir="false">Â Â Â A few days ago I
replaced the sparkplugs, ten years old or more, with six NGK
BP5ES plugs gapped to 35, and a Pertronix 3 ohm coil. I've not
yet changed the wires, distributor cap or rotor. Today I drove
the BJ8 almost 200 miles without incident at speeds up to 60
mph. While going 80 mph on the interstate, over a span of two
or three seconds, the car bucked and backfired three times. I
immediately dropped the speed to 50 and then gradually back up
to 80 with no further backfiring. What could have caused this
discomfiting turn of events? Thanks for your thoughts.</div>
<div dir="ltr" data-setdir="false">rich antal</div>
</div>
<pre wrap="" class="moz-quote-pre">
</pre>
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<br>
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