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If you want to test it, while your car is idling, connect the vacuum advance up to manifold vacuum. Your RPMs will shoot up 500, even though you aren't giving the engine any more throttle. I dont recommend driving around like that for your daily driver, but it does help illustrate the concept.The way I understand it, under certain conditions, the air and fuel mixture in the cylinder is less dense than in other conditions. When the mixture is less dense, the engine needs more advanced timing to burn that charge. If all you care about is your car idling at the line, and then hammering the pedal to the floor, then you'll probably never miss a vacuum advance. If you drive around on the streets, and worry about drivability or the cost of gas, then it doesnt hurt to have one.
If you want to test it, while your car is idling, connect the vacuum advance up to manifold vacuum. Your RPMs will shoot up 500, even though you aren't giving the engine any more throttle. I dont recommend driving around like that for your daily driver, but it does help illustrate the concept.
The way I understand it, under certain conditions, the air and fuel mixture in the cylinder is less dense than in other conditions. When the mixture is less dense, the engine needs more advanced timing to burn that charge. If all you care about is your car idling at the line, and then hammering the pedal to the floor, then you'll probably never miss a vacuum advance. If you drive around on the streets, and worry about drivability or the cost of gas, then it doesnt hurt to have one.
