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Sounds like too much spark advance.
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of Michael Oritt <=
michael.oritt@gmail.com>
Sent: Monday, January 25, 2021 4:56 PM
To: john harper <ah100tech@gmail.com>
Cc: Healeys <healeys@autox.team.net>
Subject: Re: [Healeys] Backfire in rebuilt engine with less than 500 miles
...or an exhaust leak, or too rich or too lean, or too much advance, etc.
You might have to put the car on a chassis dyno in order to replicate and c=
ure the issue. Or stop going so fast, but who wants to do that?
Best--Michael Oritt
100tech@gmail.com>> wrote:
David
It is possible that your fuel pump cannot quite keep up with the fuel neede=
d at this top limit. I don't know what pump you have fitted but the square =
base version or the double version give a higher flow rate.
Before making major changes it might be worth checking that the pump has th=
e correct diaphragm travel.
geye@porterscustom.com>> wrote:
..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 ye=
ars 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 me=
chanical advance. These need regular maintenance (mostly forgotten) to prev=
ent 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 th=
e plugs and wires.
If the car is still on points check the dwell angle and points condition. A=
lso check the timing.
Kees Oudesluijs
:
Listeners:
I have been driving my 67 BJ8 since rebuilding and working on the rest of t=
he 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 bac=
k fired, so I let off the gas and returned to normal highway speeds. Engin=
e ran fine all the way home. Suggestions what could cause the backfire at h=
igh speeds?
Bob Begani
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orterscustom.com
--
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My Wo=
rld go here: WWW.PORTERBIKES.COM/<http://WWW.PORTERBIKES.COM/>
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<div>Sounds like too much spark advance. </div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys <healeys-b=
ounces@autox.team.net> on behalf of Michael Oritt <michael.oritt@gmai=
l.com><br>
<b>Sent:</b> Monday, January 25, 2021 4:56 PM<br>
<b>To:</b> john harper <ah100tech@gmail.com><br>
<b>Cc:</b> Healeys <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] Backfire in rebuilt engine with less than 500=
miles</font>
<div> </div>
</div>
<div>
<div dir=3D"ltr">
<div class=3D"x_gmail_default" style=3D"color:#3333ff">...or an exhaust lea=
k, or too rich or too lean, or too much advance, etc.</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff"><br>
</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff">You might have to pu=
t the car on a chassis dyno in order to replicate and cure the issue.&=
nbsp; Or stop going so fast, but who wants to do that?</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff"><br>
</div>
<div class=3D"x_gmail_default" style=3D"color:#3333ff">Best--Michael Oritt<=
/div>
</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Mon, Jan 25, 2021 at 11:51 AM jo=
hn harper <<a href=3D"mailto:ah100tech@gmail.com";>ah100tech@gmail.com</a=
>> wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<div dir=3D"ltr">David
<div><br>
</div>
<div>It is possible that your fuel pump cannot quite keep up with the fuel =
needed at this top limit. I don't know what pump you have fitted but t=
he square base version or the double version give a higher flow rate.</div>
<div><br>
</div>
<div>Before making major changes it might be worth checking that the pump h=
as the correct diaphragm travel.</div>
</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Mon, 25 Jan 2021 at 16:41, David=
P <<a href=3D"mailto:frogeye@porterscustom.com"; target=3D"_blank">froge=
ye@porterscustom.com</a>> wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<div>
<p>..or a momentary loss of power to the fuel pump or delivery pressure.. o=
r a sticking valve.. many possibilities..<br>
</p>
<div>On 1/25/2021 9:20 AM, Kees Oudesluijs wrote:<br>
</div>
<blockquote type=3D"cite">
<p>Some parts like i.e. the distributor or carbs are taken of the engine wh=
en 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 p=
revent them from corrosion and sticking. It is not seldom that these get st=
uck 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>Op 25-1-2021 om 15:57 schreef <a href=3D"mailto:rfbegani@gmail.com"; ta=
rget=3D"_blank">
rfbegani@gmail.com</a>:<br>
</div>
<blockquote type=3D"cite">
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-size:14pt; font-family:Arial,s=
ans-serif">Listeners:<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:14pt; font-family:Arial,s=
ans-serif"><u></u> <u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:14pt; font-family:Arial,s=
ans-serif">I have been driving my 67 BJ8 since rebuilding and working on th=
e rest of the car the past year. After installing the new shock absor=
bers and the new speedo, I took the car for
a ride. With the new shocks and the new Shaved tires, she drives lik=
e brand new car down the Tamiami Trail at 50-70 mph, so I decided to push i=
t a little more. However at 4000 plus rpms and about 90 mph, I was no=
t 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 cau=
se the backfire at high speeds?<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:14pt; font-family:Arial,s=
ans-serif"><u></u> <u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:14pt; font-family:Arial,s=
ans-serif">Bob Begani
<u></u><u></u></span></p>
</div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
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<pre cols=3D"72">--=20
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My Wo=
rld go here: <a href=3D"http://WWW.PORTERBIKES.COM/"; target=3D"_blank">WWW.=
PORTERBIKES.COM/</a></pre>
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