Spent half the afternoon educating Walt so only have time for short surfing, but here are two immediate web pages from "ignition timing optimum" search: http://www.omniturbo.com/Mopar%20Pages/Racetech/ignition_and_combustion.ht m http://www.hotrod.com/techarticles/43300/index.html Notice they say the same thing I do -- there is a point of diminishing return in ignition advance. But that is intuitive. By definition: threshold of ping/knock/clatter is NOT time of optimum spark -- it is as close as you can get to potential engine damage. "Backing off 2 or 3 degrees" (isn't that a wonderfully precise measurement) admits it! Oh, you still need to explain why advancing specified time from 13 degrees (1977) to 16 degrees (1978) on my Ford 460's (remembered spec's incorrectly as 17 to 20 -- apologies. Doesn't really matter since I do time them manually due to funky harmonic balancers) LOWERED published horsepower from 219 to 208. By your reasoning it should have gone UP. Could it be that Ford had passed the optimum point of ignition advance... Looks like a heavy gravity day, Walt. Bill Robertson #5939 >--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx> wrote: > > On Sat, 20 Dec 2003 14:52:23 -0000 "content22207" > <brobertson@xxxx> writes: > > But the engine will still run acceptably with ignition advanced > > SOMEWHAT before that point. Power is reduced, but less pollution is > created. > > Since you insist of saying the same thing over and over again, which it > seems you blindly believe but is still absolutely wrong, I've posted some > links and lines from the web. Coincidentally, they all specify increased > spark advance coupled with an INCREASE in horsepower > > 1. > "This little gem "advises" the PCM to provide maximum spark advance (1 to > 2 degree increase) yet still retain proper knock sensor and engine > function. A 5 to 7 horsepower increase is possible." > http://www.ls1motorsports.com/news.asp > > 2. > chipping a motor will usually advance the ignition timing, adjust the > fuel/air ratio, and modify several > other highly proprietary and secret things to increase performance. > http://member.rivernet.com.au/btaylor/BMWText/technical/FuelOctane.html > > 3. > R&D Stage 1 Kit includes R&D 6 degree timing advance kits, 29cc cylinder > head kit, ride plate, Aquavein scoop intake grate, reed stuffers and > power plenum air filters. The R&D kit not only provides increased > horsepower > http://www.dalesjetsports.com/watercraft/Kawasaki_SXR_800.htm > > 4. > TST adds power and torque by increasing the injection pulse width time, > and by advancing the timing of the start of injection. > http://www.snowwest.ca/swpd/atsdieselfgmc.html > > 5. > Cheap horsepower gains: > Advance timing ? experiment to see how high you can advance it and not > have pinging. > http://home.pon.net/hunnicutt/50must.htm > > Are you going to stop saying this or do I need to post another 5. > > Jim > > PS BTW raising compression lowers hp. > > ________________________________________________________________ > 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! To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx _____ 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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