This paper presents experimental results carried out to evaluate brake power improvement of a modified natural gas engine. The conventional natural gas engine produces 15% to 20% less brake power as compared to gasoline fuel that needs to be recovered through modifications and optimization in fuel injection system providing complete gas combustion into the engine cylinder. In this investigation, a multicylinder gasoline engine has been modified to bi-fuel engine, then the engine is operated for several test conditions such as: (a) constant full and half throttle conditions – to observe the variation in power production from two fuels (gasoline and CNG) and other corresponding results such as fuel flow rate and exhaust emission gases (CO, HC and NOx). Engine tune up information like variation in AFR can be known from these tests, secondly fixed load condition -to obtain same brake power output from both the fuels and all the corresponding results such as fuel flow rate and emissions results have been measured for evaluation and optimization. Finally (3) the engine was set to produce higher brake power with CNG fuel as compared to gasoline fuel. The test results show that higher brake power with CNG fuel can be achieved with lower emissions as compared to gasoline fuel. Details results including fuel consumption have been presented with discussions. The results of this investigation will be used to test and develop new compressed natural gas (CNG) direct injection (DI) engine in the near future.
- Brake power,
- Bi-Fuel engine,
- Fuel consumption,
Available at: http://works.bepress.com/mahendra/15/