ACL STD High Performance Rod Bearing Set for VW/Audi 1781cc/1984cc # 4B1606H-STD


ACL 4B1606H-STD

ENGINE BEARINGS

 
CON ROD BEARING SETMAIN BEARING SET
Part#Part#
4B1606H5M1644H
SizesSTD, .025, .25, .50STD, .25, .50
Oil ClearanceStandardStandard
Half TypeIdentical HalvesUpper & Lower
MaterialTri-metal Hardened steel backsTri-metal
Min Std Shaft Size1.8802in / 47.758mm2.1243in / 53.958mm
Max Std Shaft Size1.8810in / 47.778mm2.1251in / 53.978mm
Min Std Tunnel Size1.9921in / 50.600mm2.3228in / 59.000mm
Max Std Tunnel Size1.9929in / 50.619mm2.3236in / 59.019mm
Max Wall at Crown0.0553in / 1.405mm0.0985in / 2.502mm
Max Overall Length0.748in / 19.00mm0.728in / 18.49mm
Notescontains one oil holeSet contain 6 x 1648H and 4 x 1644H shells. Use 1648H shell in #4 position as upper and lower.

One often overlooked part when building an engine is the bearings. Getting a quality set of bearings can directly determine the longevity of your engine. We prefer to use ACL Race Bearings in all of our cars, and suggest them to all of our customers as well.

ACL Race Series Performance Engine Bearings


The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Trimetal engine bearings. Designed to withstand higher RPM conditions


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.



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