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Power calculation without indicator diagram

This estimation is based on nomograms involving engine parameter measurements taken on test bed given in manual.
1. Fuel pump index method: parameters involved fuel pump rack,observed engine speed , other
parameters may be added for accuracy like calorific value, sulfur content, density etc
2: turbocharger speed method: more effective method, parameters involved are scavenge air temperature, turbocharger speed and ambient pressure.

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Why atomisation test should not be done in slide type fuel valves

Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk  of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).