What does Recurving a distributor mean?
Generally, recurving a distributor means changing or adapting the advance or retard characteristics of a distributor to suit the engine. On this board though, it usually refers to desmogging. When you eliminate EGR, you’ll need to recurve your distributor to advance a lesser amount.
How does a vacuum advance work on a distributor?
This is how vacuum advance works. At part throttle, high manifold vacuum moves the diaphragm in the vacuum advance canister on the distributor to add more timing. But at WOT, the vacuum drops to near zero and vacuum advance is removed and the total timing then is established by the initial plus the mechanical advance.
How do I know which ignition timing is best?
That is typically 15-35 degrees before TDC (top dead center) of the power stroke depending on the engine speed. Best power is achieved when ignition timing is set to fire the spark ahead of time to reach that peak pressure at about 2 degrees after TDC.
What is distributor RPM?
The distributor also houses the centrifugal advance unit: a set of hinged weights attached to the distributor shaft, that cause the breaker points mounting plate to slightly rotate and advance the spark timing with higher engine revolutions per minute (rpm).
What happens when vacuum advance fails?
Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle’s weight. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall.
Is vacuum advance necessary?
Most distributors are set up to work in a wide variety of applications, but are not optimal for any, typically. Depending on your idle vacuum, you need an advance can that will work with your level of vacuum. If you have low vacuum, you need a can that is fully deployed at low vacuum.
How do I know if my distributor timing is off?
Signs Your Ignition Timing Is Off
- Engine knocking: Engine knocking occurs when the air-fuel mixture is ignited too soon in the cylinder.
- Decreased fuel economy: The timing of the spark plug is crucial during the ignition process.
What does it mean to recurve a distributor?
Generally, recurving a distributor means changing or adapting the advance or retard characteristics of a distributor to suit the engine. On this board though, it usually refers to desmogging.
Which is distributor machine does everyday performance use?
Everyday Performance LLC offers performance distributor recurving services, tailoring your timing advance curve to your setup. Everyday Performance LLC uses a Sun Distributor Machine #504 to fully diagnose and tune your distributor. Whether your distributor needs complete servicing or just a checkup and recurve, it will return to you ready to run.
What does re-curving a dizzy mean for a distributor?
Re-curving a dizzy means changing the advance curve or map. For the typical USA electronic distributor that means decreasing the amount of advance at most points on the map. HTH. So How is it done? Do you turn a screw in the dist or something or is this a task I should leave in capable hands?
What kind of distributor does a Chevy Delco use?
This is MSD’s street distributor for a Chevy application. In terms of layout, it’s much the same as a vintage Delco, where the mechanical advance mechanism is located under the rotor. This particular distributor is also equipped with a vacuum advance system. In a perfect world there would be no need for ignition advance curves.