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How Flywheel Weight Affects Engine Performance

 

The best flywheel to choose will depend on your engine torque, vehicle weight, gearing, and intended purpose. Choosing the proper weight is crucial in enhancing your driving experience.

Flywheels for four-cylinder and small-displacement six-cylinder applications may be lighter, as weight is related to flywheel diameter.

Standard-weight flywheels store more energy, and these flywheels are a good choice for helping to move stock-geared cars, and heavier vehicles like trucks, drag cars, rock crawlers, etc. Additionally, heavier flywheels slow throttle response and maintain engine rpm longer on deceleration, sometimes referred to as "hang time."

A lightweight flywheel translates to faster engine response, on both acceleration and deceleration. They're preferred for road racing and circle track because they allow the driver to drive deeper into turns with a sharper rpm drop as the driver lets off the throttle, then help the engine recover faster into its power band heading into the straightaway.

Turbocharged drag racers may prefer a lighter flywheel as well. Lightweight flywheels help to spool the turbo and can soften the launch with a high-torque engine.

Flywheel Material Recommendations by Application

Items

Cast Iron Flywheel

Nodular Iron Flywheel

Billet Steel Flywheel

Billet Aluminum or Lightweight Chromoly Flywheel

Stock or OE Replacement

Yes

Yes

Yes, but excessive

Not recommended

High Performance Street

Not recommended

Yes

Yes

Yes, but conditional

Towing or Off-Road

Yes, but with limitations

Yes

Yes

Not recommended

Drag Racing

No

No

Yes

Yes, but conditional

Road Racing

No

No

Yes, but not optimum

Yes

Circle Track

No

No

Yes, but not optimum

Yes

Drifting

No

No

Yes

Yes


This article is from our Dandong Foundry's How Flywheel Weight Affects Engine Performance

 

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