[Fot] Distributor centrifugal advance curve for race engine

[Tony Drews]

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
>
>
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