You just described how the Dealer Training taught us to do it : Set to Ball & pointer then drop a screw driver in your pocket and take a test drive ~ top gear , 30 MPH stamp the throttle and listen ~ no ping ? add more advance and try again .
Give it all the advance it'll take without ping . pretty good basic design , eh ? . -Nate Dennis wrote : > > > Re : 216/235 & 261 Ignition Timing > > > A couple of years ago my 1953 pickup with 1954 > 235 ran okay when timed on the BB but had a lack > of pulling power under load. Vacuum and > mechanical advance worked, the heat riser worked > and the exhaust system was clear. If pushed at > low RPM it would backfire through the carb like > a cold engine, even though fully warmed up. > > Since backfire and lack of power can both be due > to lean mixture, we installed a rebuilt carb and > verified the float level, without finding any > improvement. > > Since lack of power under load can also come > from a weak spark we replaced the spark plugs, > plug wires, rotor, cap and coil. Again, there > was no improvement. > > Still looking, we decided to try a little more > spark advance. We advanced it âsome,â drove it > and found a real improvement. Adding advance > twice more gave a huge improvement. She pulls > like a locomotive and the backfire is gone. The > timing light shows we are about 1.3 inches > advanced from the BB, we guess it to be 15 > degrees more. > > This timing method takes me back to the 1950s > when a kid with no timing light could do a > decent job by advancing a little and test > driving until it started to tinkle, then retard > it a little. If you then found it started hard > due to too much advance, you backed it off just > a little. > > Dennis McGillis > > ___________ > > ------------------------------------ Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: old-chevy-truck-unsubscribe@yahoogroups.comYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/old-chevy-truck/join (Yahoo! ID required) <*> To change settings via email: old-chevy-truck-dig...@yahoogroups.com old-chevy-truck-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: old-chevy-truck-unsubscr...@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/