MED ALL-ALLOY VERNIER DUPLEX
( £112.50 EXC VAT )
The MED crankshaft is CNC machined from steel EN40B billet and nitride hardened, with extra large C-shape counterbalance webs to reduce potentially damaging harmonics. There's an extra long keyway for a more positive crankshaft pulley location. Cooper S size big end journals with counter-bored webs reduce weight and further enhance the counterbalance effect.
Kits are supplied with Omega forged pistons and MED steel conrods of your choice, main bearings, big end bearings and thrust washers to suit.
Select your intended engine capacity from the dropdown menu above and a member of our sales team will contact you after ordering to confirm your choice of pistons.
We can also make recommendations on piston crown type (dished or flat) and cylinder head chamber capacity to achieve your intended compression ratio.
Why is an MED steel crankshaft better than a standard type?
Factory 1275 non-S crankshafts were forged from lesser grade EN16T, as opposed to CNC-machined from EN40B steel billet. The counterbalance effect is also far greater with this design. Whilst forged crankshafts can be very effectively re-worked to improve their counterbalance effect, it is not possible to add material, only subtract.
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. Starting with a brand new crankshaft also has a reliability advantage over re-working a second-hand crankshaft of unknown history.
Do they come with any certification?
The crankshafts are supplied fully balanced with certification, 100% crack detection and certification of material and heat treatments. Critical detail inspection reports are also supplied with the crankshafts.
Does this weigh less than a standard crank?
Yes - standard 1275 crankshafts weigh between 11.5kg-12kg, whereas the 81.33mm stroke steel crank weighs 10.5kg. Once re-worked, a standard crankshaft could potentially weigh less. However, the intention is not to save weight, but improve strength and counterbalance.
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. On a road car, an MED centre main strap kit may suffice, but it's not the ideal arrangement when using a high-end crankshaft.
Is this a standard replacement?
Yes - aside from the recommended steel main cap upgrade, this is a direct replacement for the standard-type crankshaft and does not require any additional machining of the block or gearbox, in all strokes.
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.