DAILY ONE INFORMATION

What is detonation? Detonation : At present the amount of power that can be developed in the cylinder of a petrol engine is fixed by the liability of a fuel to detonate, just before the flame has completed its course across the combustion   chamber and remaining unburnt charge fires throughout its mass spontaneously without external assistance. The result is a tremendously rapid and increase in pressure which sets up pressure waves that hit the cylinder walls with such violence that the walls emit a sound like a ping. It is the ping that   manifests detonation. Thus a very sudden rise of pressure during combustion accompanied by metallic hammer like sound is called detonation. The region in which detonation occurs is farthest removed from the sparking plug , and is named the detonation zone and even with severe detonation this zone is rarely more than one quarter the clearance volume.

Constant mesh gear box In this gear box, all gears on the main transmission shaft are constantly connected to corresponding gears on counter shaft or lay shaft. In addition, two dog clutches are provided on the main shaft. One dog clutch so between the second gear and cutch gear and another is between the first gear and reverse gear. Splines are out on main shaft so that all the gears are feed on it. Dog clutches can also slide on main shaft and rotate with it. However, all the gears on counter-shaft are giddily fixed to it. Different gear ratios are obtained as follows: For three forward and one reverse gear Top or 3 rd speed gear is obtained when the left dog clutch is slided to left to mesh with clutch gear by using the gear shift lever. In this case, main shaft rotates at the maximum speed. Speed ratio obtained is 1:1. Second gear is obtained when dog clutch meshes with second gear. In this condition clutch gear rotates the drive gear on counter shaft and counter...

http://en.wikipedia.org CRANKCASE         The main body of the engine to which the cylinder are attached and which contains the crankshaft and crankshaft bearings is called crankcase.This members also holds other parts in alignment and resists the explosion and intertia forces.It also protects the parts from dirt etc. In the crankcase only the engine oil are stored in self lubricate syst em the crankcase play an important role the scoop used for splashing to the engive wall are taking oil from the crankcase only so I play a majore role in lubrication system      Crankcase forming an engine block ,crankcase  are the basic engine structural component   crankcase often has an opening in the bottom to which an oil pan is attached a gasketed bolted joint. Material used for crankcase  Material which is used for making crankcase are engine block mostly cast aluminium crankcase are made via sand casting ...