Fitting Guide

1275 MAIN BEARING SETS - RACE

Name: 1275 MAIN BEARING SETS - RACE
Brand: MED Engineering
SKU: MED-1542-MBR
Price: 80.0 GBP
Availability: InStock

Part No: MED-1542-MBR

£80.00 £66.67 EXC VAT

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Product variants

Availability: In Stock

Description

Motorsport-grade main bearings that are well suited our range of steel crankshafts.

These are heavier duty than the ACL Duraglide 780 range of bearings, thanks to an extra heat treatment process.

A-plus main bearings have a location tab in the centre of the bearing, which locates in the main bearing cap. They are plain on the bottom side and have an oil groove in the top bearing.

Pre-A-plus bearings have all location tabs offset to one side. They also have an oil groove on both halves of the bearing top and bottom.

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.

What is the difference between A-Series and A-plus bearings?

A-Series bearings have a retaining tang that's offset to one side on both halves, whereas A-plus engines need one offset, and one with a centre tang. Always check your block and caps, as there was some cross-over during the 1980s.

What is the equivalent part number for these bearings?

ACL lists the A-Series as 3M2204H and A-plus as 3M2205H. A-Series oversizes are listed in inches, A-plus in mm.

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.