Let’s first break down the three components of ignition timing for a street engine. This includes initial timing, mechanical advance, and vacuum advance. When checking ignition timing ...

Most engines have between 5-20 degrees of ignition advance at idle. This is referred to as initial timing. What's the difference between mechanical and centrifugal advance? As an engine revs up ...

and many others—for optimum ignition advance rates. See All 13 Photos Mechanical advance curves are determined by a combination of weights and springs. On a small-or big-block Chevy distributor ...

This is often referred to as the mechanical ignition curve. Vacuum advance also adds timing to the engine, but it is based on engine load and is controlled by intake manifold vacuum. When the ...

Having a car with outrageous low-end throttle response and top-end horsepower is something every gearhead strives for. The correct combination of parts will get you close, but it’s the tune-up ...

Signs of incorrect ignition timing include hard starting ... Revving the engine slightly should make the mechanical advance actuate--you'll see the timing marks advance and retreat as the engine ...

and its speed determines the ignition timing and engine firing. Timing is also based on two types of distributor advance – mechanical and vacuum advance. Problems in a distributor setup can be ...