Coyne Performance S54 Engine

Core policy: Stages 1 through 3 require either a usable customer-supplied S54 core sent to Coyne Performance before the build or selection of the CPe-supplied exchange/core engine option. A usable customer core must include a serviceable block, crankshaft, and cylinder head. Stage 4 is the exception: no customer core is required and no core charge applies.

How We Handle Engine Concerns

CPe does not offer a written warranty on its built performance engines. We do take workmanship concerns seriously. Contact us promptly and we will review the engine's build record and available evidence honestly. If our review indicates that CPe workmanship caused the problem, we will acknowledge the finding and discuss a fair, case-specific response. Any goodwill assistance is voluntary and based on the facts of that engine; it is not a promise of repair, replacement, refund, or coverage for a fixed time or mileage.

Customers requiring defined manufacturer-backed warranty coverage should purchase the Genuine BMW remanufactured short engine, BMW part number 11000304349. BMW states that Original BMW remanufactured parts carry a two-year, unlimited-mileage limited warranty covering defects in materials and workmanship. BMW controls eligibility and terms; confirm current coverage with an authorized BMW Center before purchase.

Standard CPe VANOS Reliability Service

The following VANOS reliability service is included with every Coyne Performance S54 engine build:

• VANOS seal replacement
• VANOS pump disc upgrade/replacement
• Inspection of the original exhaust hub and reuse when serviceable
• VANOS oil inlet/pressure reducer upgrade
• VANOS pressure regulator

A complete replacement VANOS valve body/block is available as an option. When selected, the complete valve body/block includes a new pressure regulator. The standard included service does not automatically include a new exhaust hub or a complete new VANOS assembly.

Engine Blueprint Documentation

Every Coyne Performance engine is individually measured, clearanced, and assembled in-house. Critical machining and assembly measurements are documented throughout the build process.

Each performance engine build includes a serialized engine build/blueprint record documenting applicable measurements and information such as:

• Cylinder bore measurements
• Piston measurements
• Piston-to-wall clearance
• Main bearing clearance
• Rod bearing clearance
• Piston ring end gaps
• Relevant rotating assembly measurements
• Component weights and balance information, where applicable
• Machining information, where applicable
• Final assembly notes

The record is specific to the individual engine. Only measurements and information applicable to that build are documented.

S54 Rebuild Stage 1

Intended Use

Street and track rebuilds, including moderate forced-induction applications up to 700 WHP. This package is intended for rebuilding a tired or damaged S54 while retaining a street-friendly foundation.

Major Components / Build Specification

• Mahle 11.5:1 pistons, pins, and rings
• Reconditioned block with 87.5 mm bore
• Weight-matched, reconditioned late-style OE connecting rods
• Blueprinted, balanced, and polished OE crankshaft
• ACL main and rod bearings
• Stage 1 cylinder head
• ARP2000 head studs
• New DLC-coated rocker arms
• Choice of cams; OE standard configuration
• New OE BMW oil pump

Important Notes

• Requires a usable customer core sent first or selection of the CPe-supplied exchange/core engine option.

S54 Rebuild Stage 1.5

Intended Use

Naturally aspirated race and track applications that will see sustained stress and extended high-engine-speed operation.

Major Components / Build Specification

• Mahle 11.5:1 pistons, pins, and rings
• Reconditioned block with 87.5 mm bore
• Molnar connecting rods
• Blueprinted, balanced, and polished OE crankshaft
• ACL main and rod bearings
• Stage 2 cylinder head with complete Ferrea valvetrain
• ARP2000 head studs
• New DLC-coated rocker arms
• Choice of cams; OE standard configuration
• New OE BMW oil pump
• New OE timing chain, guides, and tensioner

Important Notes

• Requires a usable customer core sent first or selection of the CPe-supplied exchange/core engine option.

S54 Rebuild Stage 1.5 – 3.4L Street Stroker Option

Intended Use

A street-focused naturally aspirated option for customers who want additional displacement and torque while retaining the Stage 1.5 cylinder-head package, stock camshafts, and a conservative street-oriented operating range. This is not the same specification or intended use as the max-effort Stage 3 package.

Major Components / Build Specification

• 87.5 mm bore × 95 mm stroke — approximately 3.43L displacement
• Complete matched 5150 95 mm crankshaft, custom CP piston, Carrillo connecting-rod, and bearing system
• Street-oriented compression ratio finalized with the piston specification, intended fuel, and calibration plan before order acceptance
• Stage 2 cylinder head with complete Ferrea valvetrain
• Stock/OE camshaft configuration
• ARP2000 head studs and new DLC-coated rocker arms
• New OE BMW oil pump
• New OE timing chain, guides, and tensioner
• Complete rotating assembly measured, balanced, and documented during the build

Important Notes

• This package is intended to use the added displacement for street torque rather than maximum engine speed.
• The rotating assembly is quoted and supplied as one matched system. Final component specification, availability, lead time, and pricing are confirmed before an order is accepted.
• As with any custom performance engine, no fixed mileage outcome is promised. Service life depends on calibration, operating speed, fuel, oiling, warm-up, maintenance, and use.
• Customers prioritizing the lowest-uncertainty long-mileage path should also consider the standard Stage 1.5 with the OE BMW crankshaft.
• Requires a usable customer core sent first or selection of the CPe-supplied exchange/core engine option.

S54 Rebuild Stage 2

Intended Use

Max-effort, stock-crankshaft naturally aspirated applications using race fuel or E85. This package is intended for customers seeking maximum naturally aspirated performance without moving to a stroker configuration.

Major Components / Build Specification

• Mahle 12.5:1 pistons, pins, and rings
• Reconditioned block with 87.5 mm bore
• Molnar connecting rods
• Blueprinted, balanced, and polished OE crankshaft
• ACL main and rod bearings
• Stage 3 cylinder head with complete Ferrea valvetrain and CNC porting
• ARP2000 head studs
• DLC-coated rocker arms
• Schrick 288/280 camshafts
• New OE BMW oil pump
• New OE timing chain, guides, and tensioner

Important Notes

• Higher-octane fuel is required; the established applications are race fuel or E85.
• Requires a usable customer core sent first or selection of the CPe-supplied exchange/core engine option.

S54 Rebuild Stage 2.5

Intended Use

High-power forced-induction applications using the original, non-sleeved S54 block architecture. The block is finished to an 87.5 mm bore, with added main and cylinder-head clamping for the intended application.

Major Components / Build Specification

• Custom CP 10.3:1 pistons, pins, and rings
• Reconditioned block with 87.5 mm bore
• Main bores line-honed with ARP main studs
• Carrillo connecting rods with CARR bolts
• Blueprinted, balanced, and polished OE crankshaft
• ACL main and rod bearings
• Stage 3 cylinder head with complete Ferrea valvetrain and CNC porting
• ARP L19 head studs and cut-ring head gasket
• New DLC-coated rocker arms
• Choice of cams; OE standard configuration
• New OE BMW oil pump
• New OE timing chain, guides, and tensioner

Important Notes

• Established application range is up to 900+ WHP; actual output depends on the complete vehicle, fuel system, forced-induction system, calibration, and supporting hardware.
• Requires a usable customer core sent first or selection of the CPe-supplied exchange/core engine option.

S54 Rebuild Stage 3 – 3.4L Stroker

Intended Use

Max-effort naturally aspirated stroker applications. Stage 3 uses an 87.5 mm bore, 95 mm stroke, approximately 3.43L displacement, and one complete matched rotating-assembly path.

Rotating Assembly Options

• 5150 / SP Components: 5150 95 mm billet 4340 crankshaft, matched CP piston package, and SP Components connecting rods.
• 5150 / Carrillo: 5150 95 mm billet 4340 crankshaft, matched CP piston package, and Carrillo connecting rods.
• Lang / Carrillo: Lang 95 mm billet 4340 crankshaft with its matched custom CP piston package, Carrillo connecting rods, and required wide-journal bearing specification.

Each option is quoted and supplied as a complete matched system. Components are not mixed between packages without CPe technical review. Final piston specification, bearing package, availability, lead time, and pricing are confirmed before an order is accepted.

Major Components / Build Specification

• 87.5 mm bore × 95 mm stroke — approximately 3.43L displacement
• 12.5:1 compression ratio
• Selected matched 95 mm crankshaft, piston, rod, and bearing system
• Stage 3 cylinder head with complete Ferrea valvetrain and CNC porting
• ARP2000 head studs
• DLC-coated rocker arms
• Schrick 288/280 or 304/296 camshaft options
• New OE BMW oil pump or dry-sump option
• New OE timing chain, guides, and tensioner

Important Notes

• Higher-octane fuel is required.
• The established package intent is 400+ WHP in a complete, properly configured naturally aspirated application; actual output is not guaranteed.
• All three rotating-assembly paths are quoted to order. Pricing and lead times are subject to change; call or email to confirm the current specification, price, and availability.
• The Lang crankshaft is special order. Current vendor guidance is approximately six months for the crankshaft and approximately three months for the custom rods and pistons; total package lead time must be confirmed when quoted.
• Requires a usable customer core sent first or selection of the CPe-supplied exchange/core engine option.

S54 Rebuild Stage 4 – Extreme Forced-Induction Sleeved Stroker

Intended Use

Extreme forced-induction applications requiring a sleeved S54 block and the package's maximum block, rotating-assembly, and cylinder-head specification.

Major Components / Build Specification

• Coyne Performance-supplied S54 block, fully reconditioned and sleeved as part of the build
• 85 mm sleeved bore
• Custom turbo-spec CP pistons
• 95 mm Marine stroker crankshaft
• Custom Carrillo connecting rods
• Stage 3 cylinder head with complete Ferrea valvetrain and CNC porting
• Schrick 288/280 camshafts
• DLC-coated rocker arms
• ARP L19 head studs
• Billet main caps with integrated block girdle
• New OE BMW oil pump or dry-sump option
• New OE timing chain, guides, and tensioner

Important Notes

• NO CORE REQUIRED. Coyne Performance supplies the S54 block used for this package.
• There is no customer-core requirement and no core charge for Stage 4.
• The existing package is intended for extreme forced-induction builds up to 1400+ BHP; actual output is not guaranteed and depends on the complete application.