Why do we do magneto timing?
Why do we do magneto timing?
External timing is adjusted by rotating the magnetos until the precise timing is achieved at the Number 1 cylinder (front right on Lycomings). This is vitally important because you will be turning the propeller with hot mags that could cause a cylinder to fire and thus severely injure you.
What is magneto timing drift?
When magneto timing drift exceeds 5 degrees, the magneto output may be diminished and ignition of the fuel-air mixture becomes less effective. Symptoms of this condition can include: hard starting, a rough running engine, and RPM/differential RPM drops exceeding the engine manufacturers’ allowable preflight mag checks.
What is E gap in a magneto?
The E-gap (Efficiency gap) is the point at which the greatest magnetic field stress occurs. The specific number of degrees beyond the neutral magnetic position is called the E-gap angle.
What is magneto coming in speed?
But, a magneto is not capable of generating enough energy to fire a spark plug at less than, 150 RPM (The RPM necessary to create a spark over the resistance of the spark plug and air gap on the plug is called the “coming in speed”), and even at that speed, the spark would be marginal at best.
What is magneto e Gap?
E-Gap Angle. The position of the rotating magnet in a magneto when the breaker points are timed to open. The E-gap (efficiency gap) angle is several degrees of magnet rotation beyond the magnet’s neutral position.
What is Magneto coming in speed?
What is ignition timing on a magneto?
Many magnetos have a facility which allows the rider/driver to manually adjust the engine ignition timing while the vehicle is being used thereby catering for variations in engine load and speed so that the best performance can be obtained from the engine.
How do you adjust the rotation of a magneto?
This adjustment is achieved by the use of an advance/retard lever connected, sometimes by solid rod linkage, sometimes by cable, to the magneto. Moving the A/R lever rotates either the points cam (rotating armature magnetos) or the points themselves (rotating magnet magnetos) relative to the magneto drive shaft.
What do the two ends of the Lucas Magdynos do?
In a similar vein, this picture shows two different ends from Lucas magdynos where the face cam is moved by cable. If the assumption is made that they are both used on say, clockwise units, the one on the left would provide ‘tight wire’ advance where a cable is pulled, compressing a return spring, to pull the cam ring in a clockwise direction.
How to use EIC magnetos to advance?
So with these two EIC magnetos, to obtain full advance, the crank arm on the magneto on the left should be pulled up, the crank arm on the magneto on the right should be pushed down. In a similar vein, this picture shows two different ends from Lucas magdynos where the face cam is moved by cable.
