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<div class="moz-cite-prefix">In general, a total advance exceeding
34 degrees is bad news in many engines. Big end bearings, piston
pins and pistons will suffer.<br>
Kees Oudesluijs<br>
<br>
<br>
<br>
Op 14-8-2017 om 17:12 schreef David Porter:<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. </p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText">Steve Byers</p>
<p class="MsoPlainText">HBJ8L/36666</p>
<p class="MsoPlainText">BJ8 Registry</p>
<p class="MsoPlainText">AHCA Delegate at Large</p>
<p class="MsoPlainText">Havelock, NC </p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText"> </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"> </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</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.</p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText">On 8/13/2017 6:41 PM, BJ8Healeys
wrote:</p>
<p class="MsoPlainText">> Dave, are you sure about those
numbers? I believe the manual </p>
<p class="MsoPlainText">> specifies 10 BTDC static and 15
BTDC @ 600 RPM.</p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> Steve Byers</p>
<p class="MsoPlainText">> HBJ8L/36666</p>
<p class="MsoPlainText">> BJ8 Registry</p>
<p class="MsoPlainText">> AHCA Delegate at Large</p>
<p class="MsoPlainText">> Havelock, NC</p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> -----Original Message-----</p>
<p class="MsoPlainText">> From: Healeys [<a
href="mailto:healeys-bounces@autox.team.net"
moz-do-not-send="true"><span>mailto:healeys-bounces@autox.team.net</span></a>]
On Behalf Of </p>
<p class="MsoPlainText">> David Porter</p>
<p class="MsoPlainText">> Sent: Sunday, August 13, 2017
7:20 PM</p>
<p class="MsoPlainText">> To: Bob England; <a
href="mailto:healeys@autox.team.net"
moz-do-not-send="true"><span>healeys@autox.team.net</span></a></p>
<p class="MsoPlainText">> Subject: Re: [Healeys] Carb
Adjustment Help Requested - BJ8 MkIII</p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> what are the compression numbers?
Timing is set at 750RPM and 6 </p>
<p class="MsoPlainText">> degrees BTDC. Is it better or
worse with chokes engaged? DP</p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> </p>
<p class="MsoPlainText">> On 8/13/2017 3:23 PM, Bob England
wrote:</p>
<p class="MsoPlainText">>> I've had a rough idle in the
car since we picked it up in May and it </p>
<p class="MsoPlainText">>> seems to have gotten worse
ever so slightly since then.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> I've putzed around trying the
easy stuff and finally got the bullet </p>
<p class="MsoPlainText">>> and pulled the carbs
yesterday (that was fun!) as one of the carb </p>
<p class="MsoPlainText">>> pistons was sticking ever so
slightly. Stripped the carbs except for </p>
<p class="MsoPlainText">>> the throttle</p>
<p class="MsoPlainText">> shaft</p>
<p class="MsoPlainText">>> and found the floats were set
a bit low. Put it all back together </p>
<p class="MsoPlainText">>> and</p>
<p class="MsoPlainText">> still</p>
<p class="MsoPlainText">>> having an issue as she is
running quite rich, hence the call for help.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> Car: late '64 build BJ8 MkIII</p>
<p class="MsoPlainText">>> Carbs : HD8 (I think they
were new about 15 years ago - not original </p>
<p class="MsoPlainText">>> to car).</p>
<p class="MsoPlainText">>> Cam : Dennis Welch DWR-1
(installed about 15 years ago).</p>
<p class="MsoPlainText">>> Distributor : stock with
Petronix Ignitor (Petronix installed last </p>
<p class="MsoPlainText">>> weekend in the hopes it would
help). New rotor.</p>
<p class="MsoPlainText">>> Coil : Lucas Sportcoil</p>
<p class="MsoPlainText">>> Plugs : new Autolite gapped
at 25 (installed a couple of weekends </p>
<p class="MsoPlainText">>> ago) Timing : 15 degrees with
strobe (my attempt at static timing was </p>
<p class="MsoPlainText">>> a dismal failure!).</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> I set the carbs as per the
manual - 3.5 turns open on the idle trim </p>
<p class="MsoPlainText">>> screws and 2.5 turn rich on
the jet adjusting screw. Fast idle </p>
<p class="MsoPlainText">>> adjusting screw completely
off of the cam lobe.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> The best I can get it is with
the jets totally lean (i.e. not sitting </p>
<p class="MsoPlainText">>> on</p>
<p class="MsoPlainText">> the</p>
<p class="MsoPlainText">>> cam lobe) and the fast idle
screws setting the idle speed. Idle trim</p>
<p class="MsoPlainText">> screws</p>
<p class="MsoPlainText">>> backed way out with little
impact on idle. Carbs are still running rich.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> I think I have memorized the
adjustment procedure from the manuals I </p>
<p class="MsoPlainText">>> read them so many time -
(Bentley, BMC, and Haynes), and Norman </p>
<p class="MsoPlainText">>> Nock's</p>
<p class="MsoPlainText">> wonderful</p>
<p class="MsoPlainText">>> collection of papers.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> Should I be going to a leaner
needle in the carbs? Or am I just </p>
<p class="MsoPlainText">>> screwing</p>
<p class="MsoPlainText">> up</p>
<p class="MsoPlainText">>> somewhere? This is my first
attempt at adjusting SU's and I'm not </p>
<p class="MsoPlainText">>> too</p>
<p class="MsoPlainText">> happy</p>
<p class="MsoPlainText">>> with what I have done so far.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> Any and all suggestions
appreciated (except maybe if I have to yank </p>
<p class="MsoPlainText">>> the carbs again).</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> Thanks in advance.</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>> Bob England</p>
<p class="MsoPlainText">>> </p>
<p class="MsoPlainText">>>
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<p class="MsoPlainText">>> </p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText">--</p>
<p class="MsoPlainText">Dave Porter Porter Custom Bicycles
2909 Arno St. NE Albuquerque, NM</p>
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