In this design both pistons are connected on one crank pin with individuals connecting rods and it moves in equal direction up and down but its working principal is quiet different in the working cycle rather than the conventional engines.
As mentioned in the chart No. 1; the inventional engine, having two cylinders in vertical mode at inline position and having one crank pin with proper counter weight in apposite of the crank pin for proper balancing.
The pistons are connected with individual connecting roads on the same pin of the crank shaft. It means both pistons are moves in same direction in parallel position. Both pistons moves up and down-word in same line of magnitude.
At described in the chart no.l, the P1 and P2 is at top dead center (TDC) and as it moves down-word BDC (Bottom dead center) the P1 comes in intake stroke and the P2 goes in power stroke (expansion stroke) it means the power has produced in 180° travel of crank shaft by the cylinder no. 2 (P2).
Next, both pistons reaches on BDC and turn to move toward TDC, here the P1 comes in compression stroke and the P2 comes in exhaust stroke, at this movement of 180° of crank travel no any power has produced.
Next, both pistons reached on TDC again, and tend to move down-word BDC direction, the P1 gives the Power at the power stroke or / (expansion stroke) till 180° at the crank travel toward BDC and the P2 begins intake stroke and it remain upto 180° of crank travel to BDC now both pistons reached on BDC here the power has produced by the cylinder no.l (P1) after 180° of previous power stroke has finished.
Next, both pistons are tend to move upward TDC direction, the P1 which was in power stroke, has comes in exhaust stroke and the P2 which was intake stroke, comes in compression stroke and remain upto 180° of crank travel, here no any power has produced.
Now, The whole cycle of work has finished and the other next cycle is start - The P1 in intake stroke, the P2 in power stroke like as the begging of the description and repeating whole again and again like (1) P1 intake stroke, P2 Power stroke- (2) P1 compression stroke P2 exhaust stroke (3) P1 power stroke P2 intake stroke (4) P1 exhaust stroke P2 compression stroke. Thus whole four strokes has finished of both cylinders in every two revolution of the crank shaft.
Now, We can say that at the ending of previous power strokes, the gap in one power stroke to other active power stroke remain 180°
of crank travel. In the other words at finishing one successive power stroke, just a gap of 180° has met between other power stroke and thus the gap of all similar strokes remain 180° of crank travel.
It is the new age engine designed, keeping the mind in light weight, better torque, low fuel consumption, smooth running, and low noise level. The engine is the most suitable in light automobile, portable genset, pumpset and such a machine where more smooth power is required with small size engines. The engine may be most suitable at higher altitude and cold weather without external super charging arrangements.
Descriptional Chart of Various Strokes Sequence in Purposed Invention
Parallel Piston Balanced Torque four stroke 2 cylinder 1C Engine Chart No 1

(Table Removed)

Descriptional Chart of Various Strokes Sequence of Conventional four stroke 2 cylinder IC Engine
Chart No 2
(Table Removed)

CLAIMS
The invention is related to the design of 2 cylinder 1C Engine
which is quite different in respect of working cycles than the
conventional Engines, (i) I claim that each 360 degree of crank travel, the power will
produced in each cylinder one by one. (ii) I claim that the power distribution on the crank pin is in equal
magnitude in this design than other conventional engine, (iii) I claim that each 360 degree of crank travel with each strokes
(intake, compression, power and exhaust) perform with in equal
interval, (iv) I claim that the vibration will much low in slow running in this
design. (v) I claim that balanced higher torque can be achieved in such two
cylinder engines of its range. (vi) I claim that lean mixing may burnet quietly in slow running in
both cylinders which deliver equal power and no missing can
occurred in dead slow running particularly in SI engines, (vii) I claim that much lighter construction of the engine may be
designed with light fly-wheel, due to balanced compression
strokes, (viii) I claim that each stokes like intake, compression, power, and
exhaust stroke are such arranged that they comes in each
revolutions of cranks saft in equal interval, (ix) I claim that the invention is related to the design of 1C engine
and it is quite different in working cycles rather than in
conventional 2 cylinder Engine both CI and SI. (x) I claim that the induction charging efficiency and exhaust
discharging is higher rather than conventional engine.