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What is a vacuum advance? · Help Center - Summit Racing Under a light load and part throttle conditions, timing can be advanced This improves throttle response and makes the engine more efficient It also helps the engine run cooler The vacuum advance provides this benefit BEFORE the Mechanical Advance provides Total Timing Vacuum advance distributors are best for street vehicles
What is a mechanical advance? · Help Center - Summit Racing What is a mechanical advance? Definition Description The mechanical (or centrifugal) advance is an Ignition Timing control mechanism built into most distributors It is made up of: Two weights, An advance plate or cam attached to the trigger mechanism inside the distributor, and Springs that control how fast the weights are flung outward
What is ignition timing? · Help Center How is it controlled? In most modern engines, ignition timing is controlled by the engine's computer In engines with a distributor, timing can be controlled in a variety of ways Follow the links below for more information What is mechanical advance? What is vacuum advance? What is a computer-controlled compatible distributor?
What is total timing? · Help Center Definition Description The term "Total Timing" refers to the maximum amount of Ignition Timing applied to the engine How is it calculated? Total Timing = Initial Timing + Mechanical Advance How is it set? Determine your desired total timing (See below for basic guidelines ) Set your Timing Light to your desired total timing Start the engine If you have Vacuum Advance, disconnect it Rev
How do I install a new camshaft? · Help Center - Summit Racing If your calculation is smaller than what is listed, the camshaft is advanced If your calculation is larger, the camshaft is retarded Follow this link for more on Advancing and Retarding a Camshaft Perform the centerline procedure again Once intake centerline is correct, check the opening and closing points of the intake valve at 0 050 in
What size master cylinder bore do I need? · Help Center Matching Master Cylinder Bore Size to Caliper Piston Area and Pedal Ratio When upgrading brake systems, you may need to upgrade the brake Master Cylinder Typical master cylinder piston sizes can be found in the list below However, Your goal is to match the caliper and master cylinder piston areas so your brakes work with your existing Pedal Ratio Manual brakes: 3 4 in to 1 in Power brakes
Advancing Retarding a Camshaft · Help Center A Basic Overview of Cam Timing To advance or retard a camshaft is to change the alignment between the camshaft and the crankshaft When a cam is installed "straight-up," the imaginary centerlines of the two shafts line up exactly Advancing or retarding the cam pushes the centerline of the camshaft to one side or the other of the crankshaft centerline This changes the Timing of the valve
How do I break in my roller camshaft and lifters? · Help Center Procedure Breaking in an enigne with a roller camshaft is important Metal particles are created during break-in This is the biggest issue for the bearings in the roller lifter Most camshafts come with specific break-in procedures The following procedure could apply to any roller camshaft The specific instructions for your camshaft may vary slightly Whenever possible, follow the
What is Camshaft Duration? · Help Center Definition and Description Duration is how long the valve is off its seat It is listed in degrees of crankshaft rotation When someone refers to a "big cam," they mean it has longer duration, not higher Lift Manufacturers often list 2 different duration values: Advertised Duration is the degrees of crankshaft rotation that the lifter is raised more than a predetermined amount This