Questions to do with crankshaft of an engine

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    Crankshaft Engine
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SUMMARY

The discussion revolves around the calculations related to the crankshaft of a truck engine, specifically focusing on the instantaneous force on the piston, torque, and power output. Key calculations include determining the instantaneous force on the piston as 88,350 N based on a combustion chamber pressure of 50 bar, the angle OAB as 22.02 degrees, and the moment on the crank pin OB calculated as 6,000 Nm. Additionally, the rotational velocity of the crankshaft is established at 157.08 rad/s, and the crankshaft power output for a 6-cylinder engine at 1500 rpm is calculated to be 25,500 W.

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  • #31
CWatters said:
Correct.
No. The hypotenuse is larger than the other sides of the triangle. How can a component be greater than the whole?

It's possible you are confusing the mechanical geometry (where the con rod does look like the hypotenuse) with a vector component diagram where it isn't.

Consider this diagram..

View attachment 76882

I have marked a vector Fp and shown it's components in the X and Y directions. Does that make sense?
That makes sense now entirely! I see, thank you for all your help :) is there a way I can give you rep or something on this forum?
 
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  • #32
No worries. Happy Christmas!
 
  • #33
Merry Christmas! Have a good'n! Hope santa brings you lots of nice physics things! :P
 

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