Did lightweight flywheel reduce top speed and torque??? - Alfa Romeo Forum
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(Post Link) post #1 of 5 Old 16-02-10 Thread Starter
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Did lightweight flywheel reduce top speed and torque???

We have some debate recently, that lightweight FL allows engine to rev quicker, but at cost of torque and top speed drop. I do make some Google, and nothing specific.
So the question is: did lightweight FL consume more engine power in high rev than usual, and is there any torque drop after 4-5k rpm, causing another drop in top speed.
All other pros and cons is obvious, and no contest about itл
Thank you.
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doesn't consume more engine power...

and wouldn't reduce top speed or power , should increase it even.

what brought on this debate?
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No, a lightweight flywheel has absolutely no effect on your top speed. It makes no difference to the torque of your engine, but may make it feel like you have more torque when accelerating because there is slighly less inertia for the engine to overcome.

If you regard flywheel inertia as analogous to vehicle weight, if you reduce the weight of your car it doesn't hurt the top speed, or reduce the engine power....
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As previously said, shouldnt effect the top speed, the amount the engine revs to along with what the engines geared to with the road wheels will effect the top speed, thats as long as the engine has enough torque in the first place to get to its "geared" top speed. I know my Calibra will do over 140 mph now with mods on standard gearbox as thats what Ive had, with gps, but the book figures say 136. Im guessing 136mph is what you would get on a flat with standard engine and gearbox?! Strange as it still had another 500rpm to go at 140mph. Only down side I could see from putting a lightweight flywheel on is smoothness (or the lack off). Its not unknown for manufacturers to put weights on flywheels to make it run smooth an even on tickover.
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(Post Link) post #5 of 5 Old 17-02-10 Thread Starter
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Originally Posted by Cuore_Sportivo_155 View Post

what brought on this debate?
Nothing serious, we just share opinions about pros and cons of lightweight flywheels.
My view is also that top speed is'nt reduced, but can't find any tech explanation of this process.
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flywheel , lightweight , reduce , speed , top , torque

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