Good day, dear motorists! That is, you have not yet given up the idea of increasing engine power by replacing the standard camshaft with a more advanced sports camshaft? If this is the case, then you simply need to get acquainted with such a very important detail in a tuned car engine as the split camshaft gear. We hope you have already made the choice of a tuning camshaft.
Split camshaft gear: what is it for? » AutoNovator
Which timing gear to choose for the Vectra and how to determine its wear?
For high speeds, we turn the camshaft relative to the crankshaft against the direction of rotation. By doing this, we increase the opening angle of the intake valve, reducing the angle of gas-dynamic boost. That is, the split camshaft gear allows you to set the most efficient valve timing, thereby achieving optimal engine parameters.
Opel Vectra A. Camshaft gear release. for Opel Vectra B. rub. "OPELIST"...
It should be noted that when controlling valves using a single camshaft, we can talk about effective adjustment of the FGR either only for the intake valves, which we just did, or for the exhaust valves. Installation of a cut gear is recommended for 2 reasons: If there is no required overlap, then loosen the outer bolts of the gear and rotate the camshaft relative to the outer part of the gear, aligning it.
We check the alignment of the installation marks on the camshaft pulley and the rear belt cover, and also whether the mark on the flywheel in the clutch housing hatch is opposite the middle scale mark.
Moreover, the tuning step is calibrated to tenths of a degree. GDFs are usually depicted as pie charts. The intake valve begins to open before the piston reaches TDC, while the exhaust stroke is still in progress and the piston moves upward, displacing exhaust gases from the combustion chamber.
Installation of a cut gear is recommended for 2 reasons: In large-scale production of engines, deviations in the dimensions of parts from the specified drawings are inevitable. To compensate for such an error, our laboratory practices the installation of a cut gear, which allows you to change the position of its ring gear relative to the hub in steps of 0, in contrast to the factory solid gear, which is fixed in only one position and you can move away from it only a tooth forward or backward in steps 17o on the crankshaft.
As a result, there is a noticeable loss in power and torque instead of the expected increase. Installing such a shaft with a standard gear gives an increase in power and torque.
It is necessary to align the maximum valve overlap point with TDC. To do this, the camshaft is rotated 8o Fig. 2. It must also be taken into account that opening the intake valves too early when operating at low and medium speeds worsens the filling of the cylinders - exhaust gases penetrate into the intake manifold and greatly deplete the fresh mixture.
That is, the split camshaft gear allows you to set the most efficient valve timing, thereby achieving optimal engine parameters.
Reasons for installing a split gear In the opinion of experts, these are the two most significant reasons for installing a split camshaft gear. It should be noted that installing a tuning camshaft without a split gear simply does not make sense.
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By moving the right gear clockwise and the left one counterclockwise, the overlap becomes larger than standard. This is to increase the torque at high speeds. Flaws:
- deterioration of low-end dynamics
- Fuel consumption increases at high speeds
- idle speed is less stable
- In winter, the engine warms up more slowly
Advantages
- fuel consumption at idle speed decreases (by approximately 0.1-0.2 l/100 km). Good for cities with traffic jams.
- good pickup at high speeds (from 3000 rpm to 6000 rpm), increase in power by about 4%.
Installing a split gear on a VAZ 2110
- We turn out the spark plug of the 1st cylinder and install a micrometer with an extension of about 200 mm.
- We engage 5th gear and begin to slowly rotate the wheel in the direction of travel.
- We determine the top dead center (TDC) using the instrument (the needle has stopped or gone in the opposite direction).
- We remove the timing belt and mark the tooth on the gear in the position in which they are well fixed.
- We remove the standard one and put on the split gear, marking it with a mark.
- We put on the belt according to the marks made on the toothed part of the gears.
- We set the TDC indicator and combine the marks with the real values.
Instructions for an 8 valve engine on video:
