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Flywheel lightening and its impact on engine performance.

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Flywheel lightening and its impact on engine performance.

Post by LhYnxz on Tue Sep 23, 2008 7:49 pm

"No Fly(wheels) on us."
Lightening
the flywheel the flywheel works in a similar way to the wheel in the
toy cars you used to rev up and release and let it zoom off. The heavy
wheel located between the engine and the gearbox builds up rotational
force with speed and momentum.
Effectively storing the energy and helping the car resist changes in
engine speed - good for cruising at a steady speed but bad when you
need a fast engine response.



Drawbacks it takes effort to get the wheel rotating and stops the
engines revs increasing or slowing down quickly. A lighter wheel takes
strain off the engine and allows the engine to rev more freely, as a
bonus as there is less weight the engine is able to release more power.

Youll notice a race-tuned engine increases and decreases revs a lot
more quickly than a standard engine. The big downside to a lighter
flywheel is that engine momentum or inertial spin is reduced most
noticeably on a hill. The lighter the flywheel the faster engine revs will rise and fall but you will lose momentum on a hill more quickly.



Whereas the momentum in the engine is maintained with a heavy
flywheel the momentum is reduced and the hill has a much more direct
effect on the engine output. Best used in a race situation where the
track is flat with a demand for fast engine speed changes and the
engine has been tuned to output power matching the flywheel capacity
(high revving).
The driver will often heel and toe gearchange and braking taking
advantage of the greater responsiveness from the engine. Various weight
of flywheel are available allowing you to get the best torque/free
revving capabilities.



Different grades of flywheel are available for different situations
have a chat with our members in the Torquecars forum to discuss your
required application. If you feel tempted to make your own light weight
flywheel by drilling holes in it torquecars urge you to reconsider.
Even standard flywheels that are put into cars are balanced. A
wobble in the flywheel can have disastrous consequences on the engine
and will reduce your red line significantly. A fly wheel that breaks
will send a buzz saw of metal through the car potentially causing
injury to driver and passenger.
Off the shelf lightened flywheels are carefully balanced and made
of various alloys blended for strength and lightness - some even come
with holes and gaps like an alloy wheel. If you are replacing a clutch
you may just as well get the flywheel sorted while you are at it.
If you are serious about lightning bits and pieces to get a free
revving engine try a carbon fibre drive shaft. These will rotationally
flex more that their metal counterparts and reduce strain on the
engine. If a metal drive shaft breaks you will soon know about it as
parts are thrown through the car! A carbon fibre one is stronger but if
it does break it will 'broom' into 'harmless' fibres and little damage
will be done to the car.

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LhYnxz
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