1. The latest possible inlet valve should be accumulated. 2. The length of flame travel should be as short as possible. 3. There should not be hot surface at the end of region –region of gas. 4. The exhaust valve should be kept small. 5. The highest flame front velocity should be created by creating correct amount of turbulence. 6. The largest mass of charge small burn as soon as possible after ignition. 7. The heat flow should be minimum in the zone around spark plug. 8. In the end gas region surface to volume ratio should be large so that there is good cooling in detonation zone. 9. The spark plug should be positioned that it will be scored by any exhaust residual products by the incoming charge. 10. The exhaust valve heat should be well cooled. 11. The spark plug should be sufficiently cooled. 12. There should be good scavenging of exhaust gases. 13. It is des
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