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<p>Sorry should read max advance with a<i> vacuum retard system</i></p>
<p>Kees Oudesluijs<br>
</p>
<div class="moz-cite-prefix">Op 3-11-2018 om 09:48 schreef Kees
Oudesluijs:<br>
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<blockquote type="cite"
cite="mid:86b12d3e-f121-3397-1f17-6f390a81b400@chello.nl">
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<p>The maximum advantage should be limited to prevent damage to
the big end bearings. In general, depending on the engine, this
is around 32° to 35° <i><b>total</b></i> advance. The
distributor advance system with the weights and springs is
limited to about 17°, the vacuüm advance or retard (depending on
engine) may produce another 5° or so advance or retardation.
This means that when the ignition of an engine with a vacuum
advance system is set at say 10° static, the maximum advance is
a safe 32° at anything over about 2500rpm.</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 3-11-2018 om 03:05 schreef Michael
Salter:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LLxqZmUttWxBBuU6FkwBqKhTehbOvzTbk4n0fTa1w1Qvg@mail.gmail.com">
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charset=UTF-8">
<div dir="ltr">
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">Thanks for your input on
ignition timing Michael. <br>
</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">I have always found the
factory specs to be a little confusing.</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">They state 6 degrees BTDC as
the timing (which I presume to be "static") and then state
that the distributor produces 16 - 18 degrees at 2000 RPM
(distributor speed) which I figure to be 32 -36 degrees at
4000 engine RPM.</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">I interpret that to produce 6
+ 34 (2 x 17) degrees BTDC at 4000 engine RPM for a total of
40 degrees which sounds like an awful lot.</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">My engine does not sound at
all happy with 40 degrees even with 110 octane!!</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">I'm wondering if I have been
over thinking this process and the stated advance is meant
to be "at idle" with the vacuum connected (not normal
practice as far as I was taught) which would add 6 degrees
of vacuum advance which would vanish at full throttle
producing a net of 34 degrees over 4000 at full throttle.<br>
</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">I have been setting the
timing to 32 degrees BTDC with the vacuum disconnected at
4000 RPM and the engine runs fey well and very cool, in fact
too cool without a 180 degree thermostat.<br>
</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">I am running 8.3:1
compressions with an M cam.</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small"><br>
</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small">M<br>
</div>
<div class="gmail_default" style="font-family:comic sans

ms,sans-serif;font-size:small"> <br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Fri, Nov 2, 2018 at 9:16 PM Michael Oritt
<<a href="mailto:michael.oritt@gmail.com"
moz-do-not-send="true">michael.oritt@gmail.com</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0

.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_default" style="color:#3333ff">Wayne--</div>
<div class="gmail_default" style="color:#3333ff"><br>
</div>
<div class="gmail_default" style="color:#3333ff">Exactly
right--it is total advance that matters and I arrived at
that number by gradually increasing advance and seeing
the effect upon water temperature at speed and under
full load. Anything more and the car would begin to
overheat. A bit too much less advance and performance
fell off. </div>
<div class="gmail_default" style="color:#3333ff"><br>
</div>
<div class="gmail_default" style="color:#3333ff">BTW I am
running a DW "fast street" cam and tubular header and a
Mallory non-vacuum advance distributor fired with their
Unilite module. I too have a Smitty's five-speed and
the Toyota box, 180 XAS's and 3.54 diff set give me
about 72-73 mph at 3K rpm's indicated</div>
<div class="gmail_default" style="color:#3333ff"><br>
</div>
<div class="gmail_default" style="color:#3333ff">Best--Michael
Oritt</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Fri, Nov 2, 2018 at 6:03 PM Wayne
Schultz <<a href="mailto:waschu2@gmail.com"
target="_blank" moz-do-not-send="true">waschu2@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0

.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Thanks to Michael and others I am going
to stick with 34 - 35 degrees total advance for now.
What, I think this means, is that the advance at idle
is secondary and not as important as total advance.
Cruising with the the Toyota five speed or the
original overdrive on the highway is right in the 3K
RPM range so I think this the perfect RPM to limit
total advance. I might make a run to my local airport
and buy some 100LL fuel. I have worked in aviation
since 1967 so I have a few friends😃
<div><br>
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