OK: concede there's a difference between two and I may have been using wrong term. I had whichever refers to spontaneous combustion. Only showed up on hot engine, or when car was lugged in 5th (timed at 10 degrees). Timed towards 13 engine never made a peep. Lost power band, however. Is no way to red line my engine timed at 13. Did you read my post Re: power timing? Exactly how it's done -- keep retarding spark until you lose control over flame, the move slightly back towards bottom. You want spark as close to top of cylinder as possible without losing control of combustion. That's precisely what I was doing -- trying to move spark towards 10, losing control, then backing off towards 13. Sounds like you're at other end of flame propogation -- advacing spark until *IT* -- spark -- causes combustion too soon, then moving slightly towards the top. If cylinder pressure or heat low enough, or fuel not too volatile, you could probably move it even closer. Power timing yields more HP, but at expense of a dirty burn. Bill Robertson #5939 >--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <webmaster@xxxx> wrote: > Last last last word. There's a phrase "when you're in a hole, stop > digging". I get up this morning to discover Bill's well on the way to > creating his very own mineshaft... had to throw him a line. There's > still hope, Bill.... > > content22207 wrote: > > >"Have timed the ever living mess out of my engine. Back to 10, then > >start predetonating. Up to 13 and lose power. Back and forth." > > > This is the original line I took issue with. If you're getting > pre-ignition at 10 degrees, putting it at 13 will light it up even > sooner, increasing the problem. Why are you trying to argue this point > as it's basic basic basic..... (but I still went off and read up on it > to make sure, took the time to post the link etc). Even if I don't know > what I'm talking about, will you believe Darren? I think Chris Hawes > reads this list (friend of mine over here, has free-flowing, bloody > noisy exhaust, engine tuned by Darren). Was getting problems with > knocking, Darren took the timing back to 11 degrees initially, then > changed Dizzy for Renault one and ended up at 6-7 degrees due to > knocking. Have even got him on video doing this. > > > > >I 100% guarantee that in my 9.5:1 PRV, burning 89 octane fuel, > >retarding spark is NOT going to improve predetonation. > > > Wierd. Considering in the drive towards unleaded petrol a few years > back, cars had their timing retarded to cope with unleaded because > leaded has a higher octane rating and running unleaded created problems > with knocking. > > >Think about it > >fly-off-the-handle boys: if it's already pre-igniting at 10 degress, > >what in the world do you think it's going to do at 8? > > > Bill, take your right shoe off. Remove sock. Raise foot. Pick up a gun. > Load it. Take careful aim at the centre point between your middle toe > and ankle. Pull trigger. > > If it's knocking at 10 degrees, putting it at 8 may well solve the > problem because you're sparking LATER. > > Martin Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=194081.4074964.5287182.1261774/D=egroupweb/S=170512 6215:HM/A=1732161/R=0/SIG=11p5b9ris/*http://www.ediets.com/start.cfm?code= 30509&media=atkins> click here <http://us.adserver.yahoo.com/l?M=194081.4074964.5287182.1261774/D=egroupm ail/S=:HM/A=1732161/rand=938016891> 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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