My point is: PRV drops from 17 down. Race engine drops from something closer to 0 down. That's why we have vacuum advance diaphragms and they don't. That's why we can time closer to TDC and they can't. I still maintain that an over-advanced street engine, with spark advance active, will clatter like a threshing machine. If it doesn't, your timing scale/mark is probably off. Big block Fords are notorious for this as outer ring of harmonic balancer (where timing scale is etched) gradually moves with time. Bill Robertson #5939 >--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> wrote: > At idle. Rev it and pressure in intake increases (or for you, Bill, > vacuum falls). Vacuum is at max when throttle plates closed. At full > throttle, vacuum is minimum. This is the whole point of the vacuum > affecting advance and fuel enrichment via CPR. > > content22207 wrote: > > >PRV produces 17 plus inches -- more than enough to advance a rotor button. > > > > To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/SIG=12c7tl0s8/M=266841.4316200.5507732.1261774/D=egro upweb/S=1705126215:HM/EXP=1071951849/A=1911858/R=0/*http://www.lifescapein c.com/picasa/landing.php?capid=222&caId=1987> click here <http://us.adserver.yahoo.com/l?M=266841.4316200.5507732.1261774/D=egroupm ail/S=:HM/A=1911858/rand=314345913> _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/DMCForum/ * To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx <mailto:DMCForum-unsubscribe@xxxxxxxxxxxxxxx?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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