Hi Gus - Rich & Denny are right. A MIata-specific F.I. pub would be ideal, of course, but any general treatise on Bosch F.I. will cover how your system operates. On 11/6/15, Denny Esterline wrote: >> >> >> I remember I was puzzled for some time when I tried to understand vacuum >> advance as i knew that the vaccum falls away to nothing at cruise and at >> high acceleration. At cruise or acceleration I considered that there >> would >> still be a requirement for advanced timing but the fact that there was >> little vacuum at cruise or acceleration seemed to be a contradiction. >> >> It wasn't until I noticed that the vacuum pickup line was taken from the >> base of the carby body where at high cruise or high acceleration there i= s >> an increased volume of air passing thru. High volume thru the venturi >> equals high vacuum and vacuum advance to assist the mechanical advance. >> >> > Sorry for the hijack, but this is _wrong_. > A quick google gives this reference with a much better explanation than I= 'm > willing to type up > http://www.camaros.org/pdf/timing101.pdf on about the fourth page. > > -Denny > (crap, am I now "that guy arguing on the internet"?) > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .