I think Martin and I are at different ends of combustion window. He's at a point where spark is causing problem. I'm at a point where cylinder/fuel is causing problem. Probably used terms "pre-ignition" and "pre-detonation" incorrectly. My mixture was exploding on its own before spark ever hit it. Bill Robertson #5939 >--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx> wrote: > Bill, you're right, you never said that. I misunderstood what you said. > I apologize... It seemed to me at the time that it made more sense that > you mixed up advanced/retarded instead of arguing that retarding > increases knock. A knock sensor by definition retards timing when > activated. > > It's easy to get confused when even you are contradicting yourself. > First you say, > > >Back to 10, then start predetonating. Up to 13 and lose power. > > and then > > >Here's a little jewel from my new Volvo documentation been reading all > >night (B28F Manual, Section 2, Group 26, Page 21): "When the ignition > >advances the engine efficiency increases and the combustion > >temperature decreases." > > So does advancing increase power or lose power? Are you saying the > swedes are wrong? Or that increasing efficiency loses power? > > >Predetonation is an uncontrolled explosion. Why do you think spark > >gaps are specified? To control flame propogation. > > I think spark gaps are specified to get the correct voltage/duration of > spark that is needed for the engine to not misfire given the setup of the > engine and ignition system. Spark plugs don't control flame propagation, > they start it. > > >Is better to shoot spark sooner than to let mixture combust on its > >own. What in the world do you think those advance mechanisms are doing > >on distributor anyway? > > They're not "anti-detonation control mechanisms"!! They're for power and > flame propagation timing. > > >If you really feel this way I suggest you disable spark advance on > >your distributor immediately (don't forget those pesky > counterweights)... > > If I feel that to far advancing timing causes knock? > > Jim > > > ________________________________________________________________ > The best thing to hit the internet in years - Juno SpeedBand! > Surf the web up to FIVE TIMES FASTER! > Only $14.95/ month - visit www.juno.com to sign up today! Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=194081.4074964.5287182.1261774/D=egroupweb/S=170512 6215:HM/A=1754016/R=0/SIG=11pv1u2ju/*http://www.ediets.com/start.cfm?code= 30529&media=atkins> click here <http://us.adserver.yahoo.com/l?M=194081.4074964.5287182.1261774/D=egroupm ail/S=:HM/A=1754016/rand=126854329> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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