No. The vacuum advance only kicks in under conditions of high vacuum such as
light-throttle freeway cruising. It's there because a lean mixture is harder
to ignite. As soon as you get on the throttle, vacuum drops and the advance
goes away. It doesn't affect performance. That's why you have to block off
the vacuum advance when setting the timing.
You really only want a maximum advance of 32-36 degrees.
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com]On Behalf Of Belgian
> Sent: Saturday, February 22, 2003 1:45 PM
> To: firstname.lastname@example.org
> Subject: timing setting
> Hi friends,
> Question about timing.
> Max timing advance is 410 at max rmp.
> This is the result of 100 vacuum advance + 15(7.5x2) centrifugal advance +
> 160 initial advance.
> But what about the Solex U20. As there is no vacuum advance on
> solex, isn't
> it better to use a cam marked 11.5 and set the initial timing to 200.
> Result would be 23(2x11.5) + 200 = 430
> Any comments or advices about that?
> Chris - The Belgian Roadster
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