So y'all telling me that I should disconnect the vacuum line from the Weber I
just added?
(74 Spitfire use to have Stromberg)
THnx
Pat
Douglas Braun & Nadia Papakonstantinou wrote:
> You CAN'T use the vacuum retard unit on any carb other than
> the original Stgromberg! !!
>
> This vacuum retard unit needs a special type of ported vacuum connection
> which supplies full vacuum at idle, and zero vacuum as soon as
> you apply any throttle at all.
>
> The intent is that you get the full retard only during idle (for NO2
> emissions, presumably). The rest of the time it has no effect.
> When I installed HS2s on my '72, I left the vacuum retard unit disconnected,
> and I did NOT adjust the timing. Now I get more or less +8 deg.
> at idle, which is theoretically "wrong", but I get the correct advance
> the rest of the time. (And it idles just fine).
>
> A "normal" ported vacuum gives zero vacuum at idle, max vacuum
> at part throttle, and zero again at full throttle. This
> makes sense for a vacuum ADVANCE unit: You get max advance
> at part throttle for economy, less advance at full throttle
> to avoid knocking, and less advance at idle for emissions.
>
> But if you hook up the vacuum retard unit to this, it will
> certainly act wacky.
>
> In my case, I could presumably install a proper vacuum advance unit,
> and hook it to my SUs. Then I would probably get better gas mileage,
> but I would NOT get any more full-throttle power...
>
> Doug Braun
> '72 Spit
>
> P.S.: The Benteley manual has a bunch of tables and charts
> for the various distributors and advance units.
>
> At 10:04 AM 8/11/00 -0400, you wrote:
>
> >Well after a tedious 2 hours I believe I like the way they are balanced.
> >throttle stops, choke, high idle steps...all look/feel great to me.
> >
> >My floating idle.... got rid of that flaky vac. retard..
> >
> >The vac retard unit was not hold a vac between 0 and -10psi. It would 'bleed
>down'
> >Below -10psi it would hold fine.
> >So... while mildly accelerating 95-10 psi vac) the ignition timing would
>float around +/- 5 degrees.
> >the hole must seal up above 10 psi of vac because at these levels it will
>hold the position.
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