What should the BTDC be on a Chevelle?
What should the BTDC be on a Chevelle?
If it is 36 to 38 degrees BTDC you are all set. If it is too high or too low, you must adjust the mechanical advance in the distributor to get it where you want it… you DO NOT get it by rotating the distributor in the engine again since that would change your initial static timing setting.
What should the initial and total timing be on Chevelle?
Just for clarification: Initial is set at idle using the timing tab, Total is set at 3000-3500 using tape, Keep vacuum line off for all settings. thanks for the help, and patients,
What’s the total crank advance on a Chevelle?
Remember that mechanical advance as set in the distributor must be multiplied by 2 to get its affect on the engine (crank advance). So if you set the distributor’s mechanical advance to 11 degrees that would be 11 x 2 = 22 crank degrees. Adding that 22 to your 14 degrees initial static setting gives you a TOTAL advance of 36 degrees.
What causes a loping idle on a Chevelle?
A loping idle is caused by a long duration cam with lots of overlap! These cams require LOTS of advance in initial static timing in order to have any bottom end at all. It is quite common to run at up to as much as 14 or 16 degrees BTDC static timing, as long as you limit TOTAL timing, with all mechanical advance in, to 36 or 38 degrees.
Just for clarification: Initial is set at idle using the timing tab, Total is set at 3000-3500 using tape, Keep vacuum line off for all settings. thanks for the help, and patients,
If it is 36 to 38 degrees BTDC you are all set. If it is too high or too low, you must adjust the mechanical advance in the distributor to get it where you want it… you DO NOT get it by rotating the distributor in the engine again since that would change your initial static timing setting.
How does a vacuum advance work on a Chevelle?
When viewed from the top, the distributor shaft (and the eight-sided cam for the points) turns clockwise. When the vacuum advance rod pulls on the breaker plate, it rotates the breaker plate (and the points) counter-clockwise, which “advances” the opening of the points (triggering the coil to fire the spark plugs).
Remember that mechanical advance as set in the distributor must be multiplied by 2 to get its affect on the engine (crank advance). So if you set the distributor’s mechanical advance to 11 degrees that would be 11 x 2 = 22 crank degrees. Adding that 22 to your 14 degrees initial static setting gives you a TOTAL advance of 36 degrees.
