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Engine Moment of Inertia

Engine Moment of Inertia

Engine Moment of Inertia

(OP)
I need a bit of help for a project I am currently working on, and hopefully somebody can help.  I am trying to determine the moment of inertia of an engine by performing some sort of bench test.  Does anybody have a test method for this?  I was thinking along the lines of removing the valves/spark plug to reduce the pumping losses and make some sort of fixture that I could drop different weights to spin the crank and measure the time it takes the weights to drop a certain distance.

I think there would be too much error trying to calculate this using all of the component's masses.

-Reidh

RE: Engine Moment of Inertia

I think you'll actually find it easier to do analytically.


However, if you want to do a physical test then your method won't really work. You'll mostly be measuring friction in the rings and valve gear. The accurate way to do a test is to suspend each component from a trifilar suspension and measure the frequency of the torsional mode.

Cheers

Greg Locock

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