What should my timing advance be?
“Timing advance” refers to the number of degrees before top dead center (BTDC) that the spark will ignite the air-fuel mixture in the combustion chamber at the end of the compression stroke. Ideally, the time at which the mixture should be fully burnt is about 20 degrees ATDC.
Does timing affect air fuel ratio?
Correctly timed ignition will cause peak cylinder pressures to occur around 12 to 15 degrees after TDC. If the peak cylinder pressure is reached too early, power will be lost as the piston fights to compress the burning air/fuel mixture.
What happens when you increase the timing advance?
Increasing the timing advance raises the high-end power, reducing the low-end. Decreasing the timing advance raises low-end power, reducing the high-end. Example: Magneto timing was reduced 6 degrees in our blown alcohol drag racer, and our low-end 60-foot times were quicker by 0.05 seconds from more low-end power.
How to set your timing for peak performance?
With an adjustable light set at 36 degrees, align the stock timing marks with fi0fl when the timing is fipegged out.fl With the non-adjustable light, align your new 36-degree mark with fi0.fl Rev the engine a little to make sure the timing will not advance any further. Shut it down. Pop the cap and rotor and re-install the springs.
What’s the timing curve on a vacuum advance?
I have the advance plate set at a 15 degree timing curve. My initial at idle is 20 degrees and total is 35 degrees all in around 2800 to 3000 RPM. My question is hooking up the vacuum advance. It runs alot better with it hooked up. Now here is the problem. It isn’t doing jack at idle.
What’s the best timing for a small block Chevy?
Small block Chevys (and most other GM performance V8 engines) perform best when the total timing (full centrifugal advance plus the initial timing setting with vacuum advance disconnected) is all in by 2,500 Π2,800 rpm and is set to 36 Π38 degrees. If you have an adjustable timing light, this is very easy to check.