SKU: 1164708860

ACL Race Series Bearings BMW S55 2979cc Inline6 DOHC 4v Turbo CONROD BEARING - STD, .025, .25, .50 6B1584H

Sale price$175.05 Regular price$194.50
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Description

ACL Race Series Bearings BMW S55 2979cc Inline6 DOHC 4v Turbo CONROD BEARING - STD, .025, .25, .50 6B1584HABOUT ACL For over 70 years precision engine bearings have been manufactured in Launceston, Tasmania, Australia. During this time ACL has been a major OEM supplier to the Australian & International automotive industry, whilst providing an extensive replacement product range for the global aftermarket. Today ACL produces one of the largest aftermarket range of engine bearings and has a global reputation for robust metallurgy, quality, precision,

ABOUT ACL

For over 70 years precision engine bearings have been manufactured in Launceston, Tasmania, Australia.

During this time ACL has been a major OEM supplier to the Australian & International automotive industry, whilst providing an extensive replacement product range for the global aftermarket.

Today ACL produces one of the largest aftermarket range of engine bearings and has a global reputation for robust metallurgy, quality, precision, innovation and performance.

ACL has a long and rich history in motorsport – it is in our DNA. The ACL RACE Series Performance Engine Bearings of today has a strong pedigree in motor racing that traces its roots back to the 1960’s with the manufacture of engine bearings for use in the world conquering Brabham Formula 1.

Further experience in the Australian Supercars Championship, drag racing, speedway, drifting & rally with its range of RACE Series Performance Engine Bearings being the first choice for discerning engine builders the world over.

The ACL RACE Series Performance Engine Bearing offering covers over 200 varied engine applications covering a wide range of performance engine bearings for Australian, American, Japanese, Korean & European applications. The range continues to expand to cover new engine releases.

The company has a high degree of vertical integration encompassing: tooling & product design, bearing strip manufacture, tooling & machine manufacture as well as the complex manufacturing processes & systems required to produce the final product.

ACL's Business Management Systems hold the internationally recognized ISO9001: 2015 Quality Management System, ISO14001: 2015 Environmental Management System & ISO451001: 2018 Occupational Health & Safety Management System certification.

Description: BMW S55 B30

Capacity: 3999 CC

Cylinders: 8

Bore Size: 3,622 in / 92 mm

Stroke: 2,9606 in / 75,2 mm

FEATURES

  • HIGH STRENGTH OVERLAY PLATE with reduced thickness for improved fatigue properties
  • HARDENED STEEL BACKS on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
  • INCREASED CRUSH for improved bearing retention
  • ELIMINATION OF FLASH PLATING on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing.
  • INCREASED ECCENTRICITY to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
  • 3/4 GROOVED MAIN BEARINGS to optimize bearing load carrying surface area and oil flow to the conrod bearings.
  • TIGHT CONSISTENT WALL TOLERANCES to help you maintain consistent clearances.
  • ENLARGED ID CHAMFERS on bearing edges where required to accommodate large fillet radius on performance crankshafts.
MAIN BEARING - STD, .025, .25, .50
  • High performance Tri metal engine bearings
  • Designed to withstand higher RPM conditions
  • High strength overlay plate with reduced thickness for improved fatigue properties

    Specifications for STD size only

    Sizes STD, .025, .25, .50
    Oil Clearance
    Half Type Upper & lower
    Material F780
    Min. Std Shaft Size 59,971 mm / 2.3611 in
    Max. Std Shaft Size 59,99 mm / 2.3618 in
    Min. Std Tunnel Size 65 mm / 2.5591 in
    Max. Std Tunnel Size 65,019 mm / 2.5598 in
    Max Wall at Crown 2,5 mm / 0.0984 in
    Max Overall Length
    21,9 mm / 0.8622 in (1581H)
    27,95 mm / 1.1004 in (1582H(F))

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 1164708860

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Parish L. Wilson
Lowell, US
★★★★★ 5
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Reviewed in the United States on January 28, 2026
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Gordon
Lake Worth, US
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Reviewed in the United States on February 4, 2026
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John Pohlman
Natrona Heights, US
★★★★★ 5
Look good.
Seem to be good quality. Happy with them.
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Reviewed in the United States on July 6, 2025
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Karen L Geisler
Port Orchard, US
★★★★★ 5
Nice unit
Using this for deterring my hot rod being stolen. Good price for this. Installation was no surprises and just let them try to steal my hot rod now. First one that was ordered arrived damaged, went through the process of getting a replacement which was simple and received the replacement in a couple of days.
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Reviewed in the United States on September 20, 2024
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Steven Runyon
San Leandro, US
★★★★★ 3
Does what it does
Does what it does
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Reviewed in the United States on November 10, 2025

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