Gas Engines Are Known As Internal Combustion Enginesand Are Divided Into Two General Classes, Specificallytwo Cycle And Four Cycle Engines. A Cycle Of An Engine Represents One Stroke Of The Piston Or One Half Revolution Of The Crank Shaft, As A Completerevolution Represents Two Cycles. With A Two Cycleengine, The Power Impulse Occurs At Each Revolution,while With Four Cycle Engines It Occurs At Everyother Revolution, Hence The Terms Two And Four Cycleengines.Both Classes Have Their Own Specific Advantages Anduses. For Autombiles, The Four Cycle Engines Ismost Used. For Motor Boats On The Other Hand, Thetwo Cycle Engine Is Most Often Used.The Horse Power Of Gas Engines Is Designated As HPand Also Brake Test HP. The IHP Is The TheoreticalHP, Which Is Found By Figuring Different Formulas,in Which The Diameter Of The Bore, Length Of The Stroke In Inches, And Number Of Revolutions Per Minute Form The Basis For Calculation. The Resultsare Found By The Use Of Such Formulas.The BTHP On The Other Hand, Is The Power The Engineactually Develops In Service, And Is Considerablyless Than The IHP. Keep In Mind, This Depends Uponthe Degree Of The Mechanical Perfection Attained Inthe Construction Of The Same. If Both The Compressionand Construction Are Good, The Engine May Actuallyreach 80 - 88 Of The Intended IHP.With Gasoline Engines, High HP And High RPM Rangesare What Makes Them Popular. Gas Engines Have Alwaysbeen More Popular Than Diesel Vehicles, For The Simplefact That They Can Achieve More Speed. If Speedis What You Are After, Gasoline Vehicles Are Whatyou Should Be Looking For. Although They May Lackin Torque And Raw Power, They Make Up For It Withspeed And Tuning Options.(word Count 304)PPPPP
