917 Comparison of advantages

From the foregoing descriptions it will be realised that the high performance two-stroke engine cannot claim greater, mechanical simplicity than its four-stroke competitor, and it is still doubtful whether it will ever achieve equally favourable specific fuel consumption.

Approaching 100% higher output for a given space and weight appears to be achieved, though progress in supercharging of the four-stroke engine may reduce the advantage once more. Waste heat difficulties may well be the ultimate determining factor with both types.

Smoother torque and more favourable bearing load factors are inherent advantages which the two-stroke cycle will always be able to claim, and these should react favourably on maintenance and operational acceptability. Higher rotational speeds and smoother torque will react favourably on transmission design and endurance, and the advantages of a lighter flywheel in facilitating gear changing and aiding rapid acceleration have already been mentioned.

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