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Old 04-18-2007, 12:58 AM   #1
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Lightweight Flywheel Questions...

I know that a lightweight flywheel reduces rotating mass by about 20 lbs... but why would this benefit? reasons I believe it doesnt:

more rotating mass creates?..... more torque (a 20 pound swinging is harder to stop than a 10 pound hammer)

when u shift, what rpm does the stock flywheel put u at when u let out the clutch? usually about the rpm where ur engine will catch in the next gear...

less rotating mass should in turn create better gas mileage... SO, since Ford is trying left and right to increase gas mileage (like the 07 re-tune) why didnt they themselves put a lighter flywheel on the focus?

I will be buying a lightweight flywheel when i turbo (cuz I have to) but I am just trying to figure out why they are selling them?


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Old 04-18-2007, 01:12 AM   #2
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i dunno...i dont need my rpm's dropping any faster than they do now...when ever i do take the rpm's up to the 6500 area the second i let off the gas the rpm's are right where i need them for the next gear...i know alot of the svt guys were doing that mod...their power comes from the high end hp, so it makes sense for them to want to shift faster.
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Old 04-18-2007, 01:17 AM   #3
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well i've decided I couldnt care less... there are pros and cons.... but I have to get it anyways cuz the duratec has no clutches available that use the stock flywheel

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Old 04-18-2007, 01:25 AM   #4
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hahahah.....ah.. just think of the end result bro......that whining turbo...pimmmmp.
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Old 04-18-2007, 02:16 AM   #5
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the light'n flywheel is there for two reasons really... you were correct about taking off mass for rotation. it allows to free up more horsepower with less mass but also allows you to rev up and down faster b/c of the reduced weight.
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Old 04-18-2007, 07:43 AM   #6
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it depends on what you want to do i guess.... for drag racing a stock "heavy" flywheel would be good for launching... and i guess the opposit and road race app would be good for a light weight flywheel where you will possibly be in gear for longer amounts of time.
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Old 04-18-2007, 11:00 AM   #7
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Just so you know, replacing your flywheel with a lightweight one does reduce rotational mass and engine momentum. Good for racing of many kinds... except if you plan to go uphill. Reducing your engines momentum makes it spool up and down much faster, but at the cost of needing to apply a lot more power going uphill.
If you live in the mountains, you might reconsider if this is your daily driver.
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Old 04-18-2007, 01:56 PM   #8
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A lightwheight flywheel does free up HP so why would you have trouble on hills unless your starting from a full stop?
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Old 04-18-2007, 06:14 PM   #9
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because it doesnt help with torque...
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Old 04-18-2007, 11:19 PM   #10
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It doesnt effect torque unless your clutch is slipping against the the flywheel using its stored momentum. That extra momentum will equal extra torque for that period of time. You mainly want a good weighing flywheel for starting from a full stop to get extra torque from the momentum of the flywheel where the torque from the engine at that low rpm would not be able to get you started on its own. Thats why you will have to rev higher from a full stop to get going with a lightweight flywheel.
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