Piston Force Graphs: Manipulating Parameters in Combustion Pistons

[physea]

Hello guys!
Can I view graphs of Piston Force versus Piston Displacement or time, in a combustion piston?
I would be interested to see how the graph varies by manipulating parameters such as fuel amount, air amount, piston geometry, rpm, etc
Thanks!

 

[Nidum]

https://nathbeke.files.wordpress.co...and-operating-characterstics-of-ic-engine.pdf

 

[physea]

https://nathbeke.files.wordpress.co...and-operating-characterstics-of-ic-engine.pdf

very interesting finding thanks!

 

[scott mcfee]

hmm I can tell you that the highest force on the piston is at tdc in the overlap position. The less the piston weighs the higher rpm you can run. The less the piston weighs the less the connecting rod has to weigh. You would think rod angle is the limiting factor in rod ratio/ stroke. The 900 cubic inch pro mod engines have a rod ratio/ angle that you think would not work. (1.3 lol) They use a 11.1 inch deck height A 5.5 inch stroke. A 7.250 long connecting rod. and a 5.1 inch bore. red line is about 8000 lol rpm If you look at the rod angle you would think the piston would go through the side of the block- it does when you make a mistake.The biggest drag/ load are the valve springs. They are maybe 500 lbs on the seat- 1200 lbs on the nose x 16 x 8000 rpm. I think net lift is now 1.2 inches. NASCAR engines like to run close to the theoretical rod ratio 1.83? There is an argument over whether the lighter weight let's the engine rev faster or whether the longer rod/ higher ratio make more power. The drag racers go with lighter. NASCAR goes with rod ratios closer to ideal. If you do the load versus weight cals. you will see why light weight pistons are most important.

 

[Ranger Mike]

we did a pretty good job beating this dead horse on the Mechanical Engineering forum
i suggest you read it..enter SEARCH tool at upper right hand of this screen and enter piston force..numerous threads..excellent disucssions

https://www.physicsforums.com/threads/formulas-for-engine-cylinder-perssure.907182/