Spec S13/S14 SR20DET Aluminum Flywheel
SPEC SN22A is an aluminum flywheel for the turbocharged 2.0L SR20DET in Nissan's S13 and S14 chassis. SPEC lists it for the S13 200SX turbo (1989-1994) and the S14 Silvia (1994-1998), and in the US it is most often bought for SR20DET swaps into a 240SX that keep the SR20 five-speed. Owners shop for it when the clutch is coming out anyway and they want the engine to rev and drop rpm faster between shifts, or when the original flywheel is cracked, heat checked or worn past resurfacing.
The flywheel bolts to the crank, carries the starter ring gear and gives the clutch disc its rear friction face. Its mass also acts as an energy store. Cutting that mass means less inertia for the engine to spin up, so the SR20DET picks up rpm faster in the lower gears and the revs fall faster on an upshift, which makes heel-toe and drift transitions crisper. SPEC lists SN22A at 11 lb, machined from aluminum, compared with a heavier stock iron or steel part.
The trade-offs are real and worth knowing before you buy. Less stored energy means you need a bit more throttle and slip to launch from a stop, the idle can feel less settled, and drivetrain rattle at idle may increase. On a street car most owners adapt within a few days; on a drift or track car the quicker response is the point.
A slipping clutch on a boosted SR20DET is usually the disc or pressure plate first, so check those and the clutch hydraulics before blaming the flywheel. Once the transmission is out, look at the friction face under good light and measure runout and thickness against your service manual limits. Our slipping diagnosis guide covers how to separate true clutch slip from other drivetrain faults, and the manual versus automatic repair cost article explains why doing the flywheel during a clutch job saves a second round of labor.
SPEC's application list for SN22A is the S13 200SX turbo SR20DET (1989-1994) and the S14 Silvia SR20DET (1994-1998). What matters is the engine and its flywheel bolt pattern, not the body shell, so an SR20DET swapped into a 240SX with the SR20 transmission is the usual US use. A KA24DE 240SX with its factory engine is not a match, and neither is a front-drive SR20 in a Sentra or G20. Swap builds mix parts, so compare the crank flange, starter and clutch size with this flywheel or send us your engine, transmission and year before ordering. You can browse more in our hard parts collection.
If you want a steel option instead, the Competition Clutch 10.28 lb steel flywheel covers SR20DET transmissions as well.
| Brand | SPEC |
| Part number | SN22A |
| Fits | Spec S13/S14 SR20DET Aluminum Flywheel |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Only when the car has an SR20DET swap. SPEC lists it for the S13 200SX turbo and S14 Silvia SR20DET; the factory KA24DE in a US 240SX uses a different flywheel.
SPEC lists SN22A at 11 lb.
No. SPEC lists SN02A-4 for an SR20DE-to-QR25 six-speed swap, a different application. For an S13 or S14 SR20DET, SN22A is the one SPEC names.
Launching takes a little more throttle and slip, and idle rattle may increase. Most drivers adjust quickly, and the payoff is faster rev response.
The clutch disc and pressure plate, release bearing, pilot bearing and flywheel bolts. Check the rear main seal while it is accessible.
Follow the break-in for the clutch you install. Avoid hard launches and full boost until the disc has bedded in.
