Before proceeding to an operation such as the nomination of ignition, it is necessary to get acquainted with some definitions.For example, the ignition timing.It is known that at the time when the piston passes the compression stroke, the crankshaft makes a half turn, it is rotated by 180 degrees.This concerns not only the compression stroke, and all the other so the full cycle of the 4-stroke engine makes two revolutions or 720 degrees.
There is such a thing as the octane number of gasoline.We will not go into the details of how it is measured, it is important that it is different.Now, gasoline with different octane rate of fire is very different.If the ignition timing set accurately when the piston is at TDC, the ignition occurs at the time when it goes down under the effect of inertia of the flywheel.
To prevent this from happening, and the explosion of the mixture occurred exactly at top dead center, exhibit ignition timing.For example, if the piston VAZ-2106 does not reach the outer dead point4-5 mm, the crankshaft to a full 180 not to be missed 10 degrees.If the first cut to size of 2-3 mm, then the second is reduced to 5 degrees.It is the most common angles that apply when using the AI-80 and AI-92, respectively.
Now directly on exhibiting ignition.Consider this process as an example of non-contact system to prevent problems with a gap in the contacts.First, we need to determine the compression stroke in the first cylinder.This is done using fleece, which shuts the spark plug hole in the head, then slowly turn the ratchet of the crankshaft.If good compression cylinders, the fleece should fly out early in the cycle.
As a rule, on the crankshaft pulley on the front cover has a label.This is the ignition timing.They correspond to the above angles, as well as a century of min turn, the course of the rotation.According to the last label is usually exposed to the ignition of the AI-95 and AI-98, so the use of this mark is pretty rare.
After putting the crankshaft into position aligned label on the ignition distributor, in a variety of brands and models are different, and the timer is inserted into the mounting slot, and then fixed.
But I must say initially exhibited ignition timing may not be final.
more careful adjustment of the ignition is carried out after starting the engine, warm it up to normal operating temperature and after proper adjustment of the carburetor at idle.For this is typed in third gear speed of 35-40 km / h, then it turns on the fourth.After that it should be observed brief knock, which disappears within five seconds.If it stays for a long time, you should turn the distributor housing in the direction of rotation of the roller, or vice versa if the knock did not exist.
In conclusion, it should be said that nepravlny timing angle, especially too early, resulting in serious damage to the connecting rod and piston group, such as, for example, loosening porshpaltsa the top head of a rod or crankshaft in the lower neck.
