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<p>I just tore down a BJ8 engine with about 110K miles since
rebuild. I always ran at 15deg per the manual and there was no
damage to any of the pistons or rings (see attached). Of course,
I always ran 91-octane or better gas (except on a couple occasions
when it wasn't available). I never heard any knock, but my
co-pilot on my long trips said he did when I inadvertently lugged
the engine a couple times.<br>
</p>
<p>Somebody did a 'study' on why the BJ8 engine needed so much
initial advance, I believe the theory is that the plugs are set
further recessed in the plug than the earlier engines.</p>
<p>Bob<br>
</p>
<br>
<div class="moz-cite-prefix">On 8/14/2017 8:12 AM, David Porter
wrote:<br>
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<p>yeah.. I get that. It's just that for ANY stock engine to have
more than 10 degrees initial is unusual.. sure they seem to run
better, but when the total is too high bad things will happen in
due course... </p>
<br>
<div class="moz-cite-prefix">On 8/14/2017 7:33 AM, BJ8Healeys
wrote:<br>
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<p class="MsoPlainText">Dave, I'm not the one having the
problem and asking the question; but I was responding to
your statement that the timing is set to 6° @ 750 RPM, which
does not agree with what is published in the BMC workshop
manual for the Mk III engine (see attached). My Glenn's
AUSTIN AUSTIN-HEALEY REPAIR AND TUNEUP GUIDE (copyright
1965, and also says CHILTON 1432 on the spine) gives the
same numbers as the BMC manual. I do understand what you
mean about the advance (I have a Mallory Dual-Point
distributor with mechanical advance only), but questioned
where your numbers came from. <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Steve Byers<o:p></o:p></p>
<p class="MsoPlainText">HBJ8L/36666<o:p></o:p></p>
<p class="MsoPlainText">BJ8 Registry<o:p></o:p></p>
<p class="MsoPlainText">AHCA Delegate at Large<o:p></o:p></p>
<p class="MsoPlainText">Havelock, NC <o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: David Porter [<a class="moz-txt-link-freetext"
href="mailto:frogeye@porterscustom.com"
moz-do-not-send="true">mailto:frogeye@porterscustom.com</a>]
<br>
Sent: Monday, August 14, 2017 8:53 AM<br>
To: BJ8Healeys; <a class="moz-txt-link-abbreviated"
href="mailto:healeys@autox.team.net"
moz-do-not-send="true">healeys@autox.team.net</a><br>
Subject: Re: [Healeys] Carb Adjustment Help Requested - BJ8
MkIII</p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Steve, my Glenn's book shows the dist
as 40966A/B with centrifugal advance starting at 500RPM with
7.5 degrees, max centrifugal adds 19 more degrees at 3200RPM
plus another 8 for the vacuum advance giving a total max of
34.5 degrees. Thus if at 3200RPM your total is more than<o:p></o:p></p>
<p class="MsoPlainText">34.5 back off the initial. If your
strobe light won't allow you to calculate total, get one
that will. ;~) Healey engines are very good at not pinging
audibly. Can't count the number of engines I've seen with
damaged ring lands from too much advance.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">On 8/13/2017 6:41 PM, BJ8Healeys
wrote:<o:p></o:p></p>
<p class="MsoPlainText">> Dave, are you sure about those
numbers? I believe the manual <o:p></o:p></p>
<p class="MsoPlainText">> specifies 10 BTDC static and 15
BTDC @ 600 RPM.<o:p></o:p></p>
<p class="MsoPlainText">><o:p> </o:p></p>
<p class="MsoPlainText">> Steve Byers<o:p></o:p></p>
<p class="MsoPlainText">> HBJ8L/36666<o:p></o:p></p>
<p class="MsoPlainText">> BJ8 Registry<o:p></o:p></p>
<p class="MsoPlainText">> AHCA Delegate at Large<o:p></o:p></p>
<p class="MsoPlainText">> Havelock, NC<o:p></o:p></p>
<br>
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