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Message: <blockquote data-quote="zan" data-source="post: 1055233" data-attributes="member: 9632">any car/bike manufacturer can built a high revving engine. provided its for a lightweight vehicle otherwise, it wont be efficientin Formula 1 toyota, honda, BMW all prooved its a small matter developing an engine that spins at 18,000rpm.local assembled kawasaki ZXR250 spins at 20,000rpm but redlined at 16,000rpm.but high spinning engines does not mean necessarily high torque output.and high torque output does not mean a good engine.diesel engines are better than almost any petrol engines due to its torque peaking at low engine speed and spread out the entire band.in simpler words = flexibility and driveability.theoretecially to built engines with good torque output, we need these characteristics :-1. undersquare engines - meaning piston stroke is longer than its diameter.2. higher number of cylinders3. dieseltheory for high output alone :-1. oversquare engines - meaning short stroke2. 2 stroke engines produce high output than a 4 stroke with cimilar cc.3. multi-valve cylinder head - better breathing makes engine more efficient.4. having two camshafts to actuate 2 rowes of valves instead of one. ie DOHCbut in modern days, there are so many alternatives to bulidng a powerful engine wihtout compromising power output, torque as well as fuel economy.amongst them are1. turbo or supercharge2. direct injection engines (Gasonline Direct Injection. Fuel Stratified Injection)3. remapped-able ECU4. rotary engines5. pneumatic valves like being developed by Lotus and Renault. meaning no more need for camshafts.</blockquote>

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