DYNO EXAMPLES

To the left is a list of engines that were run on an engine dynometer. For those who don't already know, a dynometer is a water engine brake that produces horsepower and tourque ratings as an output as well as other usefull information. The engine connects to and drives a large water pump. This pump is outfitted with a restriction plate (the brake part). As the engine accelerates, the restriction plate creates a load on the pump. A meter attached to the other side of the pump reads the pressure buildup behind the restriction and mathematicaly calculates the amount of Tourque the engine is producing. This TQ figure is then placed into a fomula (tourque times RPM divided by 5250) that gives you the HP figure.

Also attached to the engine are several other sensors. A velocity hat that measures the amount of air that the engine consumes, as well as a coolant temp sensor, fuel flow meter, air temp sensor,occasionally an exhaust gas temp sensor, and so on.

The output of the dynometer (dyno) is expressed in RPM points. These points are set by the operator and can vary.

Most dyno's produce the following fields:

1 CBTRQ LB-FT This is the Tourque the engine produced.

2 CBPWR HP This is the Horsepower the engine produced

3 FHP HP This is the amount of fuel to make this HP at this RPM

4 VE% This is the volumetric efficency or how well the air flows through the engine

5 ME% This is the motor efficency or how effeciant the motor makes power

6 FA+FB LB-HR This is the amount of fuel and air in pounds an hour the motor uses.

7 A1 CFM This is the amount of air the engine consumes in cubic feet per minute.

8 A/F This is the air fuel ratio the engine has.

9 BSFC This is the brake spesific fuel consumption.

10 Air temp This is the temperature of the incoming air.

11 Watt F This is the engine coolant temperature.

12 BSAC This is the brake spesific air consumption.

Feel free to poke around at any of the example dynos. Hopefully, they'll provide more info than you would ever want or need at any one time!