MED EN40B CRANKSHAFT KIT - MINI

Why is an MED steel crankshaft better than a standard type?
Most factory crankshafts were made from lesser grade EN16T, as opposed to certified EN40B steel billet. The counterbalance effect is also far greater with this design, so it is both stronger and better balanced. 

An improved counterbalance effect helps to reduce the 'whip' often encountered with the three main bearing A-Series crankshaft, to improve longevity and performance at higher RPM levels. 

Whilst standard crankshafts can be effectively re-worked to improve their counterbalance effect, it is not possible to add material, only subtract. You're also unlikely to know the history of a second-hand crankshaft - it could be over 50 years old! 

Does this weigh less than a standard crank?
Yes - standard 1275 crankshafts weigh between 11.5kg-12kg, and this weighs 10.5kg. A heavily modified factory crank could potentially weigh less, however, but it is unlikely to have the weight in the right places for the benefits of strength and balance.

Do I need to use steel main caps?
Ideally, yes. We would highly recommend an MED four-bolt steel main cap setAFS studs and line-boring of the block when upgrading to a steel crankshaft. On a road car, an MED centre main strap kit may suffice, but it's not the ideal arrangement when using a such a high-end crankshaft.

Which conrods should I choose?
We can supply either standard length 5.750" steel conrods or longer 6.000" conrods. Longer rods alter the basic geometry of the rotating assembly to improve performance. If you'd like the longer rods, we can then supply short compression height pistons to retain the same deck clearance as standard. 

Some race series stipulate that you must use the standard conrod length. In this case we sometimes supply the same short height pistons and the block is machined down to suit. Please contact us if you're not certain.

Which pistons do I need?
The bore size may depend on your race regulations, the block you have to work with, or personal preference. We can supply a range of different compression heights and crown designs to create your desired compression ratio.

Can you make me a custom steel crankshaft?
Unfortunately with the design, drawing and machining costs involved in producing a custom design crankshaft, it would prove too expensive. However, we have developed our crankshaft designs over many years using decades of A-Series engine experience, so you can be assured of the best possible setup for the vast majority of applications.

Does this come with any certification?
Each crankshaft is supplied fully balanced with certification, 100% crack detection and certification of material and heat treatments. Critical detail inspection reports are also supplied.