Engine Pressure

  • Thread starter Thread starter ditchpanther
  • Start date Start date
  • Tags Tags
    Engine Pressure
Click For Summary
SUMMARY

The discussion focuses on calculating the pressure inside the combustion chamber of a Briggs and Stratton 5hp engine at 3800 RPM. The Mean Effective Pressure (MEP) formula provided is MEP = 1000 * (P * Nr) / (V * N), where P is power in kW, Nr is the number of crank revolutions per power stroke, V is the displaced volume per cylinder, and N is the number of cylinders. It is emphasized that while MEP can be calculated using this formula, the peak cylinder pressure is significantly higher and requires a more complex analysis.

PREREQUISITES
  • Understanding of engine mechanics and thermodynamics
  • Familiarity with the concept of Mean Effective Pressure (MEP)
  • Knowledge of Briggs and Stratton engine specifications
  • Basic skills in performing calculations involving power and volume
NEXT STEPS
  • Research advanced methods for calculating peak cylinder pressure in internal combustion engines
  • Explore the impact of engine RPM on combustion chamber pressure
  • Learn about the thermodynamic cycles in gasoline engines
  • Investigate tools for measuring actual combustion chamber pressure during engine operation
USEFUL FOR

Engineers, automotive technicians, and enthusiasts interested in understanding engine performance and pressure calculations in internal combustion engines.

ditchpanther
Messages
2
Reaction score
0
Hello,
I was wondering if anyone could tell me or show me how to calculate the pressure inside the cumbustion chamber of a Briggs and Stratton 5hp engine. This calculation is done at 3800 rpm. Thanks



Ditch
 
Engineering news on Phys.org
This is a complex question, and the pressure doesn't stay constant at any point during the combustion cycle.

Mean Effective Pressure is calculated by:

MEP = 1000 * (P * Nr) / (V * N)

Where MEP is in kPa, P is power in kW, Nr is the number of crank revolutions per power stroke, V the displaced volume per cylinder, and N the number of cylinders.

Note that the peak cylinder pressure will be much higher than this, but the calculation of this is far more involved.
 
Thanks a lot this will really help with what we are doing

Ditch
 

Similar threads

Replies
19
Views
3K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 45 ·
2
Replies
45
Views
7K
Replies
18
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 6 ·
Replies
6
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K