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S14 vs. M10 crankshaft


fdovargas

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I can only answer the last question, the basic advantage: increased displacement. The s14 crank has a longer stroke than the m10. The s14 motors also had a bigger bore, so the s14 without a bigger bore does not equal 2.3 liters in an m10 block (without mods).

I have an s14 in an m10 block and (beside boring for more displacement -- I have about 2.2 liters), I needed to grind a little so the rods had the necessary clearance. Whether it is worth it all depends on what kind of motor you are building (street, street/track, track, etc.) and how much power you're looking for.

It is more difficult to use one on a tii and what rods and pistons too use become issues. All solveable, but more money....

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now: '72 Inka 2000 touring, '82 Alpina C1 2.3  & '92 M5T (daily driver)

before: a lot of old BMWs (some nice, some not so much), a few air-cooled 911s and even a water-cooled Cayman S

Alpina restoration blog: https://www.alpinac1.com/

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