Name: ACL BMW N54B30/N55B30 3.0L .25mm Oversized Performance Rod Bearing Set
Brand: ACL
Price: 186.27 USD
Availability: InStock

Question 1

What does it mean to have undersized bearings?

Accepted Answer

When an engine is rebuilt, the machine shop may need to grind the crankshaft or connecting rods to achieve a smooth, round surface. This makes the rod journal slightly smaller, requiring an undersized bearing to maintain the correct oil clearance. These bearings are 0.25mm / 0.010 inch undersize.

Question 2

How do I know if I need undersized bearings?

Accepted Answer

During an engine rebuild, the machine shop will measure the crankshaft and connecting rod journal diameters. They will then recommend the appropriate bearing size to achieve the correct oil clearance. Always follow their recommendations and plastigage the bearings during assembly to confirm proper clearance.

Question 3

What is the correct oil clearance?

Accepted Answer

Oil clearance specs vary depending on the engine and application. Refer to the engine manufacturer's specifications or your machine shop's recommendations for the correct oil clearance for your engine. Using the wrong oil clearance can lead to engine damage.

ACL BMW N54B30/N55B30 3.0L .25mm Oversized Performance Rod Bearing Set

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