How much timing advance is normal?
Most naturally aspirated engines like a total timing of 34 to 36 degrees BTDC, (Before Top Dead Center) AKA “Advance”. Nitrous and supercharged engines usually run less than that, unless you plan on blowing the heads off the engine or blowing holes through your pistons.
What should your timing advance be at idle?
Most engines have between 5-20 degrees of ignition advance at idle.
Does retarding timing make more power?
When it comes to turbocharged or supercharged engines that are running at higher levels of pressure, retarding the timing of an engine can be more beneficial. Retarding the timing on these kinds of engines helps compensate for denser air and fuel mixtures and allows them to run more efficiently.
Can a timing advance unit cause engine knock?
One of the earliest symptoms of a problem with the automatic timing advance unit is engine knock. Engine knock occurs when the air-fuel mixture is ignited before the optimum timing, causing uneven combustion to occur. Uneven combustion can cause engine knock, which in turn can cause permanent damage to the engine if left unchecked.
What are the symptoms of a bad automatic timing advance unit?
Another symptom of a problem with the automatic timing advance unit, one more specific to diesel engines, is excessive black smoke from the tailpipe.
How do you change the ignition timing on a vacuum advance?
Start the engine and aim the timing light at the timing marks on the engine crankshaft pulley. Adjust the timing by using the above procedures until the correct timing is achieved, then unplug the rubber hose and push it back onto the vacuum advance.
Can a bad timing advance unit cause black smoke?
For this reason, a problem with the timing advance unit can quickly cause problems that can upset the the combustion process. Usually, the combustion will be incomplete, and the excessive fuel will be burned inside of the vehicle’s exhaust producing black smoke.