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FORMULAS & TABLES

DISPLACEMENT OF EVOLUTION ENGINES: 

CALCULATING THE DISPLACEMENT OF A TWO CYLINDER ENGINE:

       Displacement can be determined by the formula: D = B X B X S X 1.5708

Where:	D = Displacement
	B = Bore
	S = Stroke

CALCULATING COMPRESSION RATIO:

Compression ratio can be determined by the formula:

C = D + Vd + Vs + Vc

Vd + Vs + Vc

 

Where:	C = Compression ratio
	D = Displacement of one cylinder
	Vd = Volume of dish (+) or dome (-) on piston
	Vs = Volume of squish clearance
	Vc = Volume of combustion chamber

To calculate the compression ratio of an engine using Sputhe cylinders the following values may be used.

D = 782cc for the 95.4” kit	D = 850cc for the 103.8” kit
Vd = 16cc for dish top pistons	Vd = 0cc for the flat top pistons
Vs = 11cc @ .060” clearance
Vc = 78cc for pre 1990 heads	Vc = 87cc for 1990 & up heads

Example: 1989 engine using a 95.4 ci kit with dish top pistons:

C =	D+Vd+Vs+Vc=	782cc+16cc+11cc+80cc=	897cc =	8.54
	Vd+Vs+Vc	166cc+11cc+80cc	105cc	1

 

FORMULAS FOR CALCULATING TORQUE & HORSEPOWER:

T =	Hp X 5252	Hp =	T X rpm
	Rpm		5252

TABLE OF EQUIVALENTS:

1 inch = 25.4 mm	1 cubic inch = 16.387cc
1 mm = 0.039371 inch	1 liter (1000cc) = 61.024 cubic inch

 

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