Flywheel speed fluctuation?
Flywheel speed fluctuation?
(OP)
Hi,
Is there a guideline for the minimum coefficient of speed fluctuation for flywheels, below which the engine will not idle?
I think this might depend on the type of engine, so assume it's a 4-stroke spark ignition engine with a very high compression ratio.
Is there a guideline for the minimum coefficient of speed fluctuation for flywheels, below which the engine will not idle?
I think this might depend on the type of engine, so assume it's a 4-stroke spark ignition engine with a very high compression ratio.





RE: Flywheel speed fluctuation?
RE: Flywheel speed fluctuation?
What is your criterion for failure? I'd guess it was rough running, which is partly a function of your engine mounts and so on.
Engine size would also come into it.
Sorry, as you can tell I've never had to work this out, but I have had to redesign engine mounts etc to accomodate lower idle speeds.
Cheers
Greg Locock
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RE: Flywheel speed fluctuation?
RE: Flywheel speed fluctuation?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Flywheel speed fluctuation?
Regards
Pat
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RE: Flywheel speed fluctuation?
Although, with the same moment of inertia the kinetic energy that the flywheel contains is proportional to the angular speed squared (as pat hinted).
So, to keep the energy within the flywheel constant btw 2 different idle speeds the inertia must change by a 2nd power.
Fe
RE: Flywheel speed fluctuation?
RE: Flywheel speed fluctuation?
There's no "guideline" - only judgment calls as to how much vibration transmitted to whatever the engine is attached to would be considered acceptable.