Fitting Guide

BIG END BEARING SETS - RACE

Name: BIG END BEARING SETS - RACE
Brand: MED Engineering
SKU: MED-1543-BER
Price: 70.0 GBP
Availability: InStock

Part No: MED-1543-BER

£70.00 £58.33 EXC VAT

Sale

Product variants

Availability: In Stock

Description

Motorsport-grade main bearings that are well suited our range of steel crankshafts. These are more heavy duty than the ACL Duraglide 780 range of bearings, thanks to an extra heat treatment process.

There are options to suit 1275 A-plus engines with 1.750" big ends in standard and +10 sizes.

For Cooper S, Sprite/Midget and 998 engines with 1.625" big ends, select the Cooper S/998 option, also in standard or +10 sizes.

We also list bearings specifically for the MED Multiweb crankshaft, which runs a large-diameter narrow-width journal.

Additional Information

We can supply standard size or 0.010" oversize for reground crankshafts. If you require an alternative size, please contact us for availability.

Bearing Finish
The final operation in the manufacture of ACL Race Series engine bearings is electroplating. In this operation, the bearing appearance changes to a dark tarnished colour which can vary from black / brown / blue / copper.

This colouration is restricted to the surface atoms and has no effect on bearing performance.

Frequently Asked Questions

What is the advantage of ACL Race bearings over the 'standard' 780 Duraglide?

The Race Series are made to exactly the same high standards, but with an extra heat treatment process, which makes them harder wearing. They are particularly well suited to use with EN40B steel cranks, or within any high-rpm A-Series engine.

Which bearings do I need?

We keep three base sizes, with 0.010" oversize versions if your crankshaft has been reground. 1275 non-Cooper S engines all had 1.750" diameter big end journals, whereas Cooper S and 998 engines had 1.625". The Multiweb option only suits the MED Multiweb crankshaft design.

What is the equivalent part number for these bearings?

ACL lists the 1275 big ends as 4B2206 and Cooper S/998 as 4B2201.

Can you supply in-between or non-standard sizes to suit my crankshaft?

No, you'll need to have your crankshaft machined to the correct size if the journals are worn out of tolerance, rather than try to size bearings to suit. Unfortunately it's not feasible to have custom bearings produced.