skrivet av en italienare på facebook och så är de därefter översatt från italienska till engelska i google translate, därför är vissa ord märkliga (bad inte om att han skulle skriva allt, han bara gjorde de

Photo gorgeous. It can clearly notice the rods whose summits activate the rocker arms, which in turn at their ends, emboss the opening movement of the valves, the closing of which shall then return springs, highly visible in the picture. In practice, the camshaft is in the crankcase (the part under the head light color you see here because aluminum). Inside the base (cast iron) from one side, in correspondence of the rods that you see in the picture, turns the camshaft which takes its motion through a chain connected to the motor shaft which is located further down yet. By rotating the camshaft does lift and move the rods which, in fact, move the rocker arms that are "raise" the valves. The riser (in technical jargon) of the valves, is the movement in millimeters that they undergo when they are crushed at their tops by the rocker arm, then going down and then returning in closing scrolling up thanks to the action of recall of the springs. In this case we see eight springs for as many valves, two per cylinder, a suction and a discharge.

The engine in question is a four-cylinder, eight-valve, two cylinder and is said pushrod and rocker arm. Compared to engines with camshaft in the head, there is a simplification of construction of the head which has no need of antifriction bushings or bearings to house the camshaft but this engine is less powerful and more noisy. However, the recording of the valves can be made with only two chiaavi and feeler while for the camshaft in the head need usually of "Pad" gauges of various thickness which must be replaced from time to time with that of a suitable measure to recover the game due to wear of the cam.

Here, however, the recording is done directly by acting on the barbell through a record locked by a nut and do not serve pastiglie.Una Once you find the right game and recorded with a feeler gauge and measure this, fix the registry and you're done.

This engine is also known as the overhead valve or valves parallel or aligned. In my head because the valves (which are inside the springs you see) are at the top of the combustion chamber and then over the so-called piston crowns that flow into the cylinders. Unlike some old side valve engines, the combustion is improved as the air-fuel mixture comes directly in the combustion chamber above the piston crown and then the infinitesimal droplets of gasoline, are mixed with the air molecules in an optimal manner, and homogeneity of mixing better than what happened in the side valve engines. Consequently, better efficiency and power and torque, due to the better combustion and therefore also less consumption.

The architecture of this engine, however, makes it very high and therefore bulky in height. Furthermore, the noise is due to the greater number of moving parts, which increases the games. In fact, there is no solution of continuity between the camshaft and the ends of the rods that rest on the cams themselves, then another solution of continuity between the other end of the rod and the rocker arm itself, and a further solution of continuity between the further end of the rocker arm and the top of the head of the valve is crushed in its race to the bottom, every time you press the barbell. All of these "breaks" generate imperceptible concussions due to the resulting games and then the classic ticking engine Simca.

So excessive ticking indicates excessive play, therefore: o need to register or excessive wear. Another characteristic noise is generated from the distribution chain that engine with many miles could be stretching tiny but audible to ears then fine. The noise is like a slight rattle, not to be confused with the ringing produced by an engine very tired and about to melt, that is, to destroy wear or failure of an internal movement.

Finns nog inte många som läser allt :P

Annons

The photo has no tags

Camera U20i

Focal length mm

Aperture

Shutter 1/60 s

ISO 40

Date

October 2016