The EMSCauto B48 Engine Rebuild Kit is a configurable rebuild package for F54, F55, F56, F57, and F60 MINI Cooper S / JCW models equipped with the B48 turbocharged engine. Designed for everything from a dependable stock-style rebuild to a stronger performance street build or serious long-term foundation, this kit lets you choose the piston, bearing, gasket, fastener, and timing components that best match your engine condition, power goals, and intended use.
Whether you are repairing a damaged or worn B48, rebuilding after a failure, or putting together a stronger bottom end for added boost and future upgrades, this kit helps you assemble the right combination of parts without guessing. EMSCauto offers proven component options from trusted names including SneedSpeed, ARP, King, CP, and Wiseco where applicable, giving you the flexibility to match the build to the car instead of forcing a generic package.
From clean street rebuilds to stronger high-performance setups, this kit gives MINI owners and engine builders a better starting point for restoring compression, improving durability, and building a more dependable engine foundation.
Build Path Options
| Build Path | Recommended Setup |
|---|---|
| Street Refresh | Rings Only STD size or conservative piston option, Street Series bearings, Street head gasket, bolts, no rod bolt upgrade unless needed, timing components as required, bearing size based on crank measurements |
| Light Performance | Forged or upgraded piston option in STD or oversize as required, Performance Coated bearings, Performance head gasket, Sneed Studs or ARP Studs, upgraded rod bolts, timing components as required, bearing size based on machine shop spec |
| Track Day / Aggressive Street | Forged Race Series, CP, or Wiseco pistons in STD or oversize as required, Performance Coated or King Race Rod and STD Mains, Performance or Cometic head gasket, Sneed Studs or ARP Studs, ARP rod bolts, timing components as required, bearing size based on final crank machining |
| Race Spec | CP, Wiseco, or Forged Race Series pistons in STD or oversize, King Race Rod and STD Mains or equivalent aggressive bearing strategy, Cometic head gasket, ARP Studs or Sneed Studs, ARP rod bolts, timing components as required, bearing size based strictly on final crank measurements |
Which Build Is Right for You?
| Best For | Pistons | Bearings | Head Gasket | Head Fasteners | Rod Bolts | Timing Components | Bearing Size | Summary |
|---|---|---|---|---|---|---|---|---|
| Street Refresh | Daily drivers, stock rebuilds, lightly worn engines | Rings Only STD size if pistons are reusable, or conservative replacement piston option based on bore condition | Street Series | Street | Bolts | Timing components as needed | Based on crank measurements: STD, .25mm under, or .5mm under | Best for restoring compression, oil control, and reliability without overbuilding the engine |
| Light Performance | Tuned street cars, upgraded daily drivers, stronger weekend builds | Forged or upgraded piston option in STD or oversize as required | Performance Coated | Performance | Sneed Studs or ARP Studs | Upgraded | Timing components as needed | Based on machine shop spec |
| Track Day / Aggressive Street | HPDE, repeated hard use, sustained heat, higher cylinder pressure | Forged Race Series STD / oversize, CP STD / oversize, or Wiseco STD / oversize based on bore size and brand preference | Performance Coated or King Race Rod and STD Mains | Performance or Cometic | Sneed Studs or ARP Studs | ARP | Timing components as required | Based on final crank machining |
| Race Spec | Competition builds, max-effort street/track cars, strongest available foundation | CP STD / oversize, Wiseco STD / oversize, or Forged Race Series STD / oversize depending on bore size and build strategy | King Race Rod and STD Mains or most aggressive bearing strategy appropriate to the build | Cometic | ARP Studs or Sneed Studs | ARP | Timing components as required | Based strictly on final crank measurements |
