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Aside from BMW Motorsport lacking capacity to make M88/1s for both the M1 and e12 M535i, and the lack of a wet sump, BMW probably went with the M90 because it was only slightly slower.

Unlike the M88/3, the M1’s M88/1 only had a 9.0:1 comp ratio and 239 lb/ft at 5,000 rpm, and single row timing chain. So its figures would have been only midway between the e12 M535i and e28 M5.

Factory figures:

e12 M535i 0-62 mph 7.5 seconds 138 mph
e28 M5 M88/3 0-62 mph 6.5 seconds 148 mph

estimated:
e12 M535i M88/1 0-62 mph 7.0 seconds 143 mph

Was an extra 5 mph worth a 50% price increase to use the heavier and noisier M88/1?;)

M90 powered South African e12/8 M535i

e12/8 M535i p1

e12/8 M535i p2

e12/8 M535i p3

e12/8 M535i p4

e12/8 M535i p5

e12/8 M535i p6

e12/8 M535i p7
 

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Aside from BMW Motorsport lacking capacity to make M88/1s for both the M1 and e12 M535i, and the lack of a wet sump, BMW probably went with the M90 because it was only slightly slower.

Unlike the M88/3, the M1’s M88/1 only had a 9.0:1 comp ratio and 239 lb/ft at 5,000 rpm, and single row timing chain. So its figures would have been only midway between the e12 M535i and e28 M5.

Factory figures:

e12 M535i 0-62 mph 7.5 seconds 138 mph
e28 M5 M88/3 0-62 mph 6.5 seconds 148 mph

estimated:
e12 M535i M88/1 0-62 mph 7.0 seconds 143 mph

Was an extra 5 mph worth a 50% price increase to use the heavier and noisier M88/1?;)

M90 powered South African e12/8 M535i
Thanks for the links. Been looking for this for a long time
 
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