In case of a 2-wheeler, the new engine cylinder block is known to have a fixed life period. After this cylinder block (2) has lived its prescribed life, the usual tendency is to go for its boring or sleevng. The present invention relates to how the rejected cylinder block (2) of a 2-stroke/4-stroke engine of a 2-wheeler can be reused for getting full life avoiding the need for boring/ sleeving.
In particular this invention relates to the methods necessary to carry out the job of reusing the cylinder block (2) to have original compression of the engine.
BACKGROUND OF THE INVENTION
As per the prior art, the practice regarding the vehicle is to use the cylinder block (2) or the sleeve inserted therein to the extent until compression starts weakening and even engine starting trouble comes in. As a result, efficiency of the engine is reduced and also the engine is likely to stall. Hence the cylinder block should not be used upto this condition for better engine performance.
There is, therefore a need to devise a system helping reuse of the cylinder block (2) giving nearly original compression thereby regaining engine efficiency. The present invention aims at this.
OBJECTS OF THE INVENTION
The primary object of the present invention is to have a simple, durable and inexpensive equipment involved with least labour.
The main object of the present invention is to install the equipment in the vehicle frame with small size components without increasing the size of the vehicle frame.
It is an object of the present invention to have minimum no. of parts and to have least number of spares. It is to do away with the cost of boring/sleeving.

It is another object of the present invention to have least maintenance of the parts e.g. just one time change of studs, nuts, washers etc.
It is yet another object of the present invention to have such a system which operates smoothly and regains engine efficiency.
SUMMARY OF THE INVENTION
The present invention relates to the cylinder block (2) of a 2-wheeler.
More particularly, the present invention relates to a method for increasing the life of cylinder block, expectedly double. Applies to 2-stroke/4-stroke engine.
According to an aspect, the present disclosure necessitates, in case of 2-stroke engine, to turn the cylinder block anticlockwise by 90° to utilise it for the second time. As the block is turned, the studs holes present in it, not being equidistant shall also shift with it, so refixing of the cylinder block in the new orientation shall be done by making new stud foundations in the engine body as per Drawing no. 1. This matter as well as that for 4-stroke engine shall be taken up in the Detailed description of the invention.
BRIEF DESCRIPTION OF THE DRAWING
One consolidated Drawing no. 1 is prepared for the purpose. Different views, sections, details etc. are drawn in this drawing.
A plan of the cylinder block (2) is shown in this Drawing. The cylinder block along with its 2 ports (air intake and exhaust) is to be turned 90° anticlockwise with 4 sets of new studs, nuts and washers (3,4,5).
The other 2 views show the usual shape of the piston (1) showing its oval shape on 2 sides and round shape on 2 sides. The bore diameter of the cylinder is as per

the oval shape. Oval shapes take care of piston motion whereas round shapes give gap with cylinder wall for lubrication of the piston.
DETAILED DESCRIPTION OF THE INVENTION
The present invention, relates to utilisation of the 2-wheeler cylinder block (2) for the second time giving almost original compression to the engine. To achieve this, while piston position is retained, it necessitates to turn the cylinder block anticlockwise by 90°.
In one embodiment of the present invention, the starting point of the disclosure is that the usual cross-section of the existing Piston (1) is oval on 2 sides and round on other 2 sides (Drawing 1, section AA). The cylinder bore diameter is as per the oval shape. When the piston (1) moves back and forth during operation, its 2 projected oval sides touch against cylinder walls where wear and tear occurs. The round shape of the Piston create gap with cylinder walls for its lubrication.
In one embodiment of the present invention, the cylinder block (2) shall be required to be turned anticlockwise by an angle of 90°. As the cylinder block is turned, the studs holes present (not equidistant) shall also shift with it, so for turning this block (2) and head (2-stroke engine) to the new position, 4 sets of new studs (3,4,5) shall have to be refixed at new stud foundations in the engine body as per Drawing, no. 1. Now the piston which is retained in the original position shall move in the unworn part of cylinder which was being lubricated and the worn side of the cylinder shall now become lubrication side.
In another embodiment of the present invention, in case of 2-stroke engine, since the exhaust port also gets turned with the cylinder block, it should be ensured that the exhaust pipe to be attached to it, be duly modified to suit the inside layout of the vehicle. The fuel intake port even if turned is not going to be affected as the cylinder remains connected in the whole volume of crank case. Case for 4-stroke engine follows next.

In one embodiment of the present invention, in case of a 4-stroke engine there being no ports, things are simple. Simply the block is to be turned 90° over the 4 equally spaced studs (usual practice) keeping both the piston and the head position unchanged. Also studs can be retained in this case.
In one embodiment of the present invention, if Indian manufacturers, henceforth, for their future 2-wheelers (2-stroke/4-stroke) provide all 4 stud locations 90° apart at the square ends and engrave a mark on the cylinder block for foolproof positioning of ports, things shall become very simple. In that case only cylinder block shall be required to be rotated anticlockwise. New studs may not be required and head position shall also remain unchanged.
In another embodiment of the present invention, as an interesting inference, it is advisable that the original block should be used only till the compression is ok. When the compression just starts weakening or milage is reduced due to weak compression*, this should be taken to be the end of the life of the cylinder block and thereafter the above practice should be followed to have another full life of the cylinder block. This also applies in case cylinder block is already sleeved.
*excluding other factors like over-tight brakes, low air pressure in tyres, weak shockers, too much % of oil in fuel etc.

We Claim:
1. An equipment, meant for 2-wheelers, for utilising the rejected cylinder block by making certain changes in order that the same is usable 2 times. The equipment characterised in that consists of: piston (1), cylinder block 90° turned anticlockwise (2), new items viz. studs (3), nuts (4) and washers (5) at relocated positions as described in claims 2-5 and shown in Drg. no 1, wherein apart from these new standard items, a small cost of modification is required to be incurred in shifting the exhaust pipe.
2. The equipment as claimed in claim 1 including used cylinder block (2) which is required to be rotated by 90° anticlockwise to enable it to be used second time. The piston (1) as it is, shall be retained in the original position. The position of the head, however, shall be relocated by turning it by 90° on new studs (see 3 below).
3. The equipment as claimed in claim lincluding 4 sets of new studs, nuts and washers (3,4,5) which are to be relocated, as studs holes would shift with the rotation of the cylinder block. Drilling of holes and internal tapping is required to be done to make new foundations for these studs. This applies to a 2-stroke engine.
4. The equipment as claimed in claim 1 necessitating modification of exhaust pipe to suit layout due to shift of exhaust port with the 90° turned cylinder block. Applies again to 2-stroke engine.
5. The equipment as claimed in claim 1, relaxing that the studs are not to be shifted in case of 4-stroke engine which already stand equidistant. Only cylinder block need be rotated 90° in this case on the existing studs keeping both the piston and the head positions unchanged.