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Re: [Healeys] Backfire in rebuilt engine with less than 500 miles

To: healeys@autox.team.net
Subject: Re: [Healeys] Backfire in rebuilt engine with less than 500 miles
From: David P <frogeye@porterscustom.com>
Date: Mon, 25 Jan 2021 09:40:57 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <02d201d6f32a$76260ef0$62722cd0$@gmail.com> <4a0450ed-aa8a-6b5c-e493-63a6f4c74c89@chello.nl>
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..or a momentary loss of power to the fuel pump or delivery pressure.. 
or a sticking valve.. many possibilities..

On 1/25/2021 9:20 AM, Kees Oudesluijs wrote:
>
> Some parts like i.e. the distributor or carbs are taken of the engine 
> when it is rebuild and then after having lain on the shelf for months 
> or even years are put back on the engine the way they came off, 
> without resetting or cleaning.
>
> In the distributor are the bob weights inside the body that regulate 
> the mechanical advance. These need regular maintenance (mostly 
> forgotten) to prevent them from corrosion and sticking. It is not 
> seldom that these get stuck or do not move freely which might be a 
> cause for backfiring. Also check the plugs and wires.
>
> If the car is still on points check the dwell angle and points 
> condition. Also check the timing.
>
>
> Kees Oudesluijs
>
>
>
>
> Op 25-1-2021 om 15:57 schreef rfbegani@gmail.com:
>>
>> Listeners:
>>
>> I have been driving my 67 BJ8 since rebuilding and working on the 
>> rest of the car the past year.  After installing the new shock 
>> absorbers and the new speedo, I took the car for a ride.  With the 
>> new shocks and the new Shaved tires, she drives like brand new car 
>> down the Tamiami Trail at 50-70 mph, so I decided to push it a little 
>> more.  However at 4000 plus rpms and about 90 mph, I was not looking 
>> so closely at the speedo or tack, the engine back fired, so I let off 
>> the gas and returned to normal highway speeds. Engine ran fine all 
>> the way home. Suggestions what could cause the backfire at high speeds?
>>
>> Bob Begani
>>
>>
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>>
>
> _______________________________________________
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> Suggested annual donation  $12.75
>
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-- 
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World 
go here: WWW.PORTERBIKES.COM/


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    <p>..or a momentary loss of power to the fuel pump or delivery
      pressure.. or a sticking valve.. many possibilities..<br>
    </p>
    <div class="moz-cite-prefix">On 1/25/2021 9:20 AM, Kees Oudesluijs
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:4a0450ed-aa8a-6b5c-e493-63a6f4c74c89@chello.nl">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <p>Some parts like i.e. the distributor or carbs are taken of the
        engine when it is rebuild and then after having lain on the
        shelf for months or even years are put back on the engine the
        way they came off, without resetting or cleaning. <br>
      </p>
      <p>In the distributor are the bob weights inside the body that
        regulate the mechanical advance. These need regular maintenance
        (mostly forgotten) to prevent them from corrosion and sticking.
        It is not seldom that these get stuck or do not move freely
        which might be a cause for backfiring. Also check the plugs and
        wires.</p>
      <p>If the car is still on points check the dwell angle and points
        condition. Also check the timing.</p>
      <p><br>
      </p>
      <p>Kees Oudesluijs</p>
      <p><br>
      </p>
      <p><br>
      </p>
      <p><br>
      </p>
      <div class="moz-cite-prefix">Op 25-1-2021 om 15:57 schreef <a
          class="moz-txt-link-abbreviated"
          href="mailto:rfbegani@gmail.com"; 
moz-do-not-send="true">rfbegani@gmail.com</a>:<br>
      </div>
      <blockquote type="cite"
        cite="mid:02d201d6f32a$76260ef0$62722cd0$@gmail.com">
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          <p class="MsoNormal"><span
              
style="font-size:14.0pt;font-family:&quot;Arial&quot;,sans-serif">Listeners:<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              
style="font-size:14.0pt;font-family:&quot;Arial&quot;,sans-serif"><o:p> </o:p></span></p>
          <p class="MsoNormal"><span
              
style="font-size:14.0pt;font-family:&quot;Arial&quot;,sans-serif">I
              have been driving my 67 BJ8 since rebuilding and working
              on the rest of the car the past year.  After installing
              the new shock absorbers and the new speedo, I took the car
              for a ride.  With the new shocks and the new Shaved tires,
              she drives like brand new car down the Tamiami Trail at
              50-70 mph, so I decided to push it a little more.  However
              at 4000 plus rpms and about 90 mph, I was not looking so
              closely at the speedo or tack, the engine back fired, so I
              let off the gas and returned to normal highway speeds. 
              Engine ran fine all the way home. Suggestions what could
              cause the backfire at high speeds?<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              
style="font-size:14.0pt;font-family:&quot;Arial&quot;,sans-serif"><o:p> </o:p></span></p>
          <p class="MsoNormal"><span
              
style="font-size:14.0pt;font-family:&quot;Arial&quot;,sans-serif">Bob
              Begani <o:p></o:p></span></p>
        </div>
        <br>
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        <pre class="moz-quote-pre" 
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    <pre class="moz-signature" cols="72">-- 
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World 
go here: <a class="moz-txt-link-abbreviated" 
href="http://WWW.PORTERBIKES.COM/";>WWW.PORTERBIKES.COM/</a></pre>
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