ACT 2002 Mini Cooper XACT Flywheel Streetlite

Doing the clutch on a supercharged R53 Mini Cooper S and wondering what to bolt it to? ACT 600315 is the XACT Streetlite flywheel for the 2002-2008 Cooper S, a one-piece forged chromoly flywheel that weighs 14.2 lb. It cuts rotating mass for quicker revs, gives a fresh friction face for the new clutch, and it is the flywheel ACT requires with its sprung-hub Cooper S clutch kits.

What the flywheel does in a Cooper S

The flywheel bolts to the crankshaft, carries the starter ring gear and gives the clutch disc a flat, true surface to grip. In the Cooper S the factory flywheel is heavy, which smooths idle but makes the engine slow to gain and drop revs between shifts. The Streetlite trims that weight so the supercharged 1.6L responds faster, while keeping enough mass to stay civil on the street. ACT rates the feel as noticeably improved response and acceleration with OE to mild gear rattle.

ACT lists these specifications: chromoly steel, 14.2 lb, 215 mm (8.5 in) friction surface, 138-tooth ring gear and SFI 1.1 certification. It is a heat-treated forging, CNC machined and dynamically balanced, with an induction-hardened ring gear. Flywheel bolts are included (M10-1.0 x 30 mm).

Symptoms that call for a new flywheel

• Chatter or judder on takeoff from a glazed, hot-spotted or warped friction face
• Blue heat marks or cracks on the old flywheel surface after a slipping clutch
• Starter grinding or skipping from worn ring gear teeth
• A new clutch that slips or chatters early because it was fitted to a worn flywheel
• Slow, lazy rev response you want to sharpen while the transmission is already out

How to confirm before you buy

With the transmission out, inspect the old flywheel for heat cracks, blue spots and grooves, and check runout with a dial indicator. If it is past resurfacing limits or the ring gear is damaged, replace it. If the car is slipping rather than chattering, the disc is usually the root cause; our slipping diagnosis guide covers how to tell, and flare vs slip helps sort out what you feel between shifts.

Fitment

Our listing reads 2002 Mini Cooper. ACT's application list for 600315 is the 2002-2008 Mini Cooper S with the 1.6L supercharged engine. ACT does not list the non-supercharged Cooper, and the turbocharged 2007-up R56 Cooper S uses different parts. Confirm you have the supercharged Cooper S manual, or send us your year and VIN and we will check it before you order.

Install notes

• Clean the crank flange and use the supplied bolts, torqued in a cross pattern to the factory spec.
• Wipe the friction face with brake cleaner before fitting the clutch.
• Pair it with a clutch built for it. The ACT BM2-HDSS Heavy Duty street kit must be used with this ACT flywheel.
• Center the disc with an alignment tool such as the 11-piece universal kit if your clutch kit does not include one.
• Bleed the clutch hydraulics with the brake fluid grade marked on the reservoir cap.
• Later service: ACT says XACT flywheels resurface like stock. Remove only enough to clean up the face, never more than 0.040 in (1.02 mm), and keep the correct step.

Comparing clutch options for the same car? The Clutch Masters FX200 kit is another street choice; check its flywheel requirements before ordering. For job cost planning, see our manual vs automatic repair cost guide.

Does the 600315 fit the base Mini Cooper?

ACT lists it for the 2002-2008 Cooper S with the 1.6L supercharged engine only. The non-S Cooper is not listed.

How much does it weigh?

ACT lists 14.2 lb. It is a one-piece chromoly steel forging with a 215 mm friction surface and 138-tooth ring gear.

Are flywheel bolts included?

Yes. ACT includes flywheel bolts, M10-1.0 x 30 mm.

Do I need this flywheel for the ACT BM2-HDSS clutch?

Yes. ACT says the BM2-HDSS kit must be used with an ACT flywheel with sprung hub discs, and 600315 is the matching part.

Will it make more noise than stock?

ACT describes OE to mild gear rattle. A lighter flywheel can make some gear rattle at idle more noticeable.

Can it be resurfaced later?

Yes. Remove only enough to clean it up, no more than 0.040 in (1.02 mm), and keep the correct flywheel step.

• How to Diagnose Transmission Slipping
• Shift Flare vs. Slip: How to Tell Them Apart
• Automatic vs. Manual Transmission Repair Cost