ACL Race Big End Bearings (S65)
ACL Race Big End Bearings (S65)

ACL Race Main Bearings (S65)

ACL Race Big End Bearings (S65)

ACL Race Main Bearings (S65)

Reserve for delivery. This item is not on the shelf at Hack Engineering, but your order will be processed and delivered as quickly as possible.
Lead Time: Generally 3-5 days or 2 weeks (supplier dependent) when not in stock

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£210.04

ACL Race Series main bearings for the S65 engine, as found in the E90/E92/E93 M3. ACL bearings are a vital upgrade that increase the life and strength of your S65.

Choose from OE oil clearance, or HX series for an extra .001″ as well as oversizes for ground cranks.

Why not add a bottle of Hack Engineering Engine Assembly Lubricant to protect your new bearings on first start up?

Please note that we cannot take opened packets of bearings or bolts as a return – please double check that you have the right components before opening packages.

SKU: 5M1581H Categories: Engine Components, E9X M3, BMW S65, ACL Bearings

Reserve for delivery. This item is not on the shelf at Hack Engineering, but your order will be processed and delivered as quickly as possible.
Lead Time: Generally 3-5 days or 2 weeks (supplier dependent) when not in stock

Description

Selecting Your Bearings

We are asked time and time again about which bearing sizes are the right ones to purchase – if you are in any doubt, then choose the ‘Standard Sizing’ option for a bearing that ACL have formulated to be a replacement for the originals. ACL’s bearing clearances tend to measure at the larger side of OE tolerance, making them ideal for high performance applications.

‘0.025mm’ options have an oil clearance which is 0.025mm tighter than ACL’s standard option; this is for crankshafts that measure as being undersized by a very small amount; usually due to wear. ‘HX Extra Clearance’ bearings are the other way around, with 0.025mm more clearance than the standard size. These are generally only for extreme duty drag race applications and must be specified by an engine builder.

‘0.25mm’ and ‘0.50mm’. bearings, where available, are specifically for reground crankshafts. These options should be ignored unless your crankshaft has been machined to the correct specifications by your machine shop.

In all cases it is advised that oil clearances are measured by an engine builder or qualified professional for the best results; bearing clearances are a critical element to engine longevity and performance and must not be overlooked.