[/COLOR]I know these posts are old but want to throw in my opinion
True and false the blade does spin as a sort of second flywheel............ kind of. But a briggs mower will run with out a blade on it, the big problem is the timing will be off on most.
how is aluminum any worst than cast iron? If nothing else it is better. Aluminum is softer so in theory it will be less likely to explode vs iron. This being said stock aluminum fly wheels are cast not billet so the performance strength and reliability will not be there.
I have not don't an aluminum flywheel my self but I am going to attempt it idle may be an issue though
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after some researching this afternoon I think the aurgument for not running aluminum is because of the tendancy of the magnents to become unbonded this is a valid concern but it seems like everyone that makes a decent point for this arguement also says the cast iron is just as dangerous, most real aurguments centered around the B & S animal gen 1 flywheel
If the aluminum flywheel came off of a lawnmower's vertical shaft, then you cannot use it. Vertical shaft lawn mower engines use the grass cutting blades as second flywheels. The aluminum flywheels off of lawnmowers will not work because they are to light.
NEVER USE ONE.ITS A TIME BOMB WAITING TO GO OFF.if you prefer,use the cast iron one 3 or 3.5 hp. with a stock unmodified engine,they'll last as long as you keep it under 7000 rpm.[completely stock engines won't rev to 7k anyway.]
I have not don't an aluminum flywheel my self but I am going to attempt it idle may be an issue though
edit
after some researching this afternoon I think the aurgument for not running aluminum is because of the tendancy of the magnents to become unbonded this is a valid concern but it seems like everyone that makes a decent point for this arguement also says the cast iron is just as dangerous, most real aurguments centered around the B & S animal gen 1 flywheel
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