SKU: 901-8400 | UPC: 672036022495
ARP 84.0mm Ring Compressor for BMW 1992-2006 M50 M52 M54 Engines
The ARP 84.0mm Ring Compressor delivers precision compression for piston rings on 84mm bore pistons in BMW M50 M52 M54 inline-six engines. It works with E36 325i 328i E39 525i 528i 530i E46 323i 325i 330i for reliable engine rebuilds. Tapered steel construction compresses rings evenly to avoid damage and ensure proper cylinder seating.
Key Features
- Exact 84.0mm Sizing: Matches BMW M50 M52 M54 bores precisely for secure ring compression without gaps or slippage
- Tapered Design: Gradual slope applies even pressure to prevent ring cocking breakage or distortion during piston insertion
- Steel Construction: High-strength material handles high-pressure assembly and repeated professional use
- Smooth Bore Surface: Polished interior avoids scratches on rings or pistons for clean reliable sealing
- Knurled Grip: Textured exterior provides firm hand control in tight engine bays
Product Notes
- Inspect rings and pistons for damage before compression
- Lubricate rings lightly with assembly lube for smooth operation
- Store in dry area to maintain surface finish
Installation Notes
- Professional installation recommended.
- Slide compressor over piston crown then lower to engage rings before guiding into cylinder block
- Works with OEM and aftermarket 84mm pistons no special adapters needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1992-1995 | BMW | 325i | E36 M50B25 |
| 1993-1995 | BMW | 525i | E34 M50B25 |
| 1996-1999 | BMW | 328i | E36 M52B28 |
| 1997-2000 | BMW | 528i | E39 M52B28 |
| 1999-2000 | BMW | 323i | E46 M52B25 |
| 2000-2003 | BMW | 325i | E46 M54B25 |
| 2000-2003 | BMW | 530i | E39 M54B30 |
| 2001-2006 | BMW | 330i | E46 M54B30 |
Why Choose ARP?
- ARP builds trusted components for racing and street engines worldwide
- Every tool undergoes strict quality checks for consistent performance
- Engineering focuses on durability in demanding assembly conditions
Frequently Asked Questions
- Q: Will this fit BMW E46 330i M54 engines?
A: Yes the 84.0mm size matches M54B30 bore exactly for E46 330i and similar models - Q: What material construction does it use?
A: Made from robust steel with knurled finish and smooth bore for long-lasting strength and grip - Q: What support comes with ARP tools?
A: Backed by ARP manufacturer defect warranty contact ARP for claims
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Protective cardboard box 4 x 4 x 3 inches
- Weight: 0.8 lbs
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