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Performance parts for a car typically improve the
acceleration at the expense of fuel efficiency.
Modifications typically include a longer and higher cam
duration, intake and exhaust manifolds tuned for higher
engine speeds, a lighter flywheel to reduce inertia at the
expense of idling stability,
and shorter gearing for a
greater mechanical advantage at the expense of higher
engine speed. Proposed are engine modifications designed
for fuel efficiency at the expense of performance. The
camshaft would be tuned for a shorter duration to optimize
slower engine speeds (although a high lift would still make
sense). The intake and exhaust manifolds would be tuned
for lower RPMs. The flywheel would be heavier to enable a
slower idle speed. The gearing would be taller to turn the
engine more slowly and put it under more torque load at
cruising speed.
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