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When I had crank fire ignition I did test it on the dyno and found that
a slight retard as RPM's went up helped (at least that's how I remember
it - up to 34 / 35 at 3000 rpm but down to 32 at 6000). But with my
more vintage points system, the advance is "all in" at 3000 rpm. I just
set to 30 degrees or 32 degrees or if I'm feeling particularly lucky /
brave / stupid 34 degrees at max. Whatever it ends up at low rpm is
where it ends up. When racing I'm never under 3000 RPM anyway.
Regards, Tony
On 3/19/2021 5:27 PM, timmmurphh--- via Fot wrote:
>
> What advance curve are folks using in their race engines? I have 87mm
> pistons, a Kastner G3 cam and about a 12:1 compression ratio. I am
> using about 19 degrees advance at idle (no centrifugal advance) and 30
> degrees advance at 3000 RPM. I don?t know what I have at higher RPM?s
> because I never looked. I?m currently doing an engine rebuild so I
> will have to look what I?ve got at the higher RPM?s when I get the
> engine running. I?m curious as to what others are using and if anyone
> has done any testing on a dyno with different advance curves.
>
> Thanks in advance for your input.
>
> Tim Murphy
>
> #317 BRG TR4
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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<p>When I had crank fire ignition I did test it on the dyno and
found that a slight retard as RPM's went up helped (at least
that's how I remember it - up to 34 / 35 at 3000 rpm but down to
32 at 6000). But with my more vintage points system, the advance
is "all in" at 3000 rpm. I just set to 30 degrees or 32 degrees
or if I'm feeling particularly lucky / brave / stupid 34 degrees
at max. Whatever it ends up at low rpm is where it ends up. When
racing I'm never under 3000 RPM anyway.</p>
<p>Regards, Tony<br>
</p>
<div class="moz-cite-prefix">On 3/19/2021 5:27 PM, timmmurphh--- via
Fot wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal">What advance curve are folks using in their
race engines? I have 87mm pistons, a Kastner G3 cam and about
a 12:1 compression ratio. I am using about 19 degrees advance
at idle (no centrifugal advance) and 30 degrees advance at
3000 RPM. I don?t know what I have at higher RPM?s because I
never looked. I?m currently doing an engine rebuild so I will
have to look what I?ve got at the higher RPM?s when I get the
engine running. I?m curious as to what others are using and if
anyone has done any testing on a dyno with different advance
curves.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance for your input.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tim Murphy<o:p></o:p></p>
<p class="MsoNormal">#317 BRG TR4<o:p></o:p></p>
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<br>
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