MED EN40B CRANKSHAFT KIT - MINI
( £2,833.33 EXC VAT )
The MED Multi-web crankshaft features an almost perfect 50/50 balance factor, which in conjunction with the new six-inch non-offset conrod, eliminates rotational twisting and piston side loadings normally associated with the standard A-Series configuration. With this crankshaft and conrod package, the engine will achieve a higher rpm and in turn maintain a higher bhp for longer.
Please note: the image shows a Mini multiweb - inline images on the way.
Why is an MED multiweb steel crankshaft better than a standard type?
The counterbalance effect is especially impressive with the multiweb, even more so than the regular EN40B steel crankshaft. 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. The design utilises a narrower yet larger diameter big end journal size for extra strength along the crankshaft. The EN40B steel crankshaft is best for when regulations do not permit a multiweb crankshaft – for all else this is the ultimate setup.
Is this a standard replacement?
Yes and no - it will fit a standard 1275 block but we would highly recommend a steel main cap upgrade, which will then require line-boring. The narrower big end journals mean that standard type conrods do not fit; therefore we can only supply the crankshaft as a complete package with conrods and pistons.
Does the crankshaft come with any certification?
The crankshafts are supplied fully balanced with 100% crack detection and certification of material and heat treatments. Critical detail inspection reports are also supplied with the crankshafts.
Do I need to convert the block for a steel main cap set?
Ideally, yes. We would highly recommend an MED four-bolt steel main cap set, AFS studs and line-boring of the block when upgrading to a steel crankshaft. An MED centre main strap isn't the ideal arrangement when using a high-end crankshaft.
Can you make me a steel crankshaft for my Ford Focus/Honda Civic/Subaru Impreza?
We specialise exclusively in the BMC A-Series engine and focus primarily on racing Minis and Spridgets. Currently we have no plans to design crankshafts for other vehicles/engines.