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EN40B Competition Crankshafts - Various Types

Nitrided, forged 86mm stroke, 1.625" "S" big end journal for non-S 1275/1300 block with stronger keyway for timing gears fitted.

Forged EN40B steel nitrided cranks are considered the ultimate in specification, even over the "billet" type. This is mainly because the grain pattern of a forging follows the shape of the webs and bearings whereas the billet type is machined across the grain. We stock all the forged types.heat treated for maximum durability. All are machined to fit 1275/1300 non-S center main except C-AEG479 which is "S".

All cranks have been re drawn to benefit from latest technology by having the much larger crank webs designed to reduce whip and resistance at high revs giving smoother running and easier balancing, plus being mass centre balanced which all help to provide great counter balancing features.

this is good as cranks can get.The bored holes for the big ends reduces weight of the crank and does not require drilling through the largecounterr balance C shape webs

Forged Nitrided, 81.33mm stroke, cross drilled, 1.625" "S" big end journal for 1275 S block with extra strong key for timing wheel fitted.

Forged-YES forged- EN40B steel nitrided cranks are considered the ultimate in specification, even over the "billet" type. This is mainly because the grain pattern of a forging follows the shape of the webs and bearings whereas the billet type is machined across the grain. Heated for maximum durability, these are machined to fit mains width of the Cooper S block only.

All cranks have been re drawn to benefit from latest technology by having the larger crank webs designed to reduce whip and resistance at high revs giving smoother running and easier balancing, plus being mass centre balanced.

The bored holes for the big ends reduces weight of the crank and does not require drilling through the largecounterr balance C shape webs

Forged EN40B crank, 1.75" 1300 big end journal for 1300 block with stronger keyway fitted for timing gears. Forged EN40B steel nitrided Race cranks are considered the ultimate in specification, even over the "billet" type. This is mainly because the grain pattern of a forging follows the shape of the webs and bearings whereas the billet type is machined across the grain. We stock all the forged type. All have superior oil distribution galleries, and heat treated for maximum durability. All are machined to fit 1275 non-S center main SIZE OF 1.211 except THE C-AEG479 which is for the Cooper "S" Block.

All cranks have been re drawn to benefit from latest technology by having the larger crank webs designed to reduce whip and resistance at high revs giving smoother running and easier balancing, plus being mass center balanced.

Always check gearbox for clearance with these large webs. The bored holes for the big ends reduces weight of the crank and does not require drilling through the large counter balance C shape webs.
Related Technical Articles:
Classic Mini Cooper Crankshafts & Bearings -page 36
Created: January 03, 2019
Stock or high performance crankshafts for Minis from 1959 thru 2000 are available new or reground. Straight rod or conventional crankshafts are available for the 1275cc engine. Also see our complete selection of crankshaft bearing for all the various engine sizes.
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