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Jul 21st, 2025 | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Too much timing advance can cause it to flatten out at 3/4 throttle. I'd try to retard it 2 degrees and see if it helps. Sounds like you are at the 'seat of the pants' level of dialing it in. Getting real close to on the money.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Mar 2019 Posts: 200 'Bolter | | 'Bolter Joined: Mar 2019 Posts: 200 | Carl,
Thanks for the tip! I was thinking I didn't have enough advance, but had forgot to consider it was too much. I have a digital timing light, so it's real easy for me to accurately set the ° of advance.
-Kevin
This is what happens when you live with a house-full of women, the wife and daughters name all the cars:
1960 Impala - "Frankie" (Frank Sinatra)
1961 Apache - " 'Mater Jr." (wrecker)
1965 Corvair Monza Convertible
1967 C20 "Ol' Blue" (hidden in a log cabin for 30 years)
1972 SuperBeetle Convertible - "Juliet"
1976 SuperBeetle Convertible - "Olaf"
1988 Alfa Romeo Spider Veloce - "Romeo"
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | I heard somewhere from a Hillbilly from the great State of Tennessee that 1 degree too much advance in timing is as bad as 4 degrees of to little advance.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Mar 2019 Posts: 200 'Bolter | | 'Bolter Joined: Mar 2019 Posts: 200 | I heard somewhere from a Hillbilly from the great State of Tennessee that 1 degree too much advance in timing is as bad as 4 degrees of to little advance. I read that too! -Kevin
This is what happens when you live with a house-full of women, the wife and daughters name all the cars:
1960 Impala - "Frankie" (Frank Sinatra)
1961 Apache - " 'Mater Jr." (wrecker)
1965 Corvair Monza Convertible
1967 C20 "Ol' Blue" (hidden in a log cabin for 30 years)
1972 SuperBeetle Convertible - "Juliet"
1976 SuperBeetle Convertible - "Olaf"
1988 Alfa Romeo Spider Veloce - "Romeo"
| | | | | Joined: Jan 2013 Posts: 1,518 'Bolter | | 'Bolter Joined: Jan 2013 Posts: 1,518 | I guess the initial setting depends on how much mechanical advance Langdon puts in his distributor. I've heard look for a total mechanical and initial to be in the 34 degree range if you have a dial back. Remember to DC the vacuum advance when you check for full timing say at 3500 or so. BTW, too much initial timing will cause the starter to drag on warm start ups, it is all a juggling act and with today's alky fuels make sure you jet up the main jet a size or so especially if you drive at sea level and high barometers. 10 % alcohol in the fuel will make you about 5% leaner than otherwise non alky fuels in my book.
Steve
1953 Chevrolet 3100261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done In the DITY GalleryVideo of the 261 running1964 GMC 1000305 Big Block V6, sm420, the next cab off restoration
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