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Late S14 crankshaft into M10


allbim

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Does anyone know if the 87 mm stroke crankshaft used in the 2.5L S14 engine can be used in the M10 block. Everybody seems to be using the 84 mm stroke crank. Is there a clearance problem?

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

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I only know what I have read online, the crank fits except,

(1) 2L front cover needs to be machined to accept the S14 seal or

turn the front of the S14 to accept the 2L hub and gears.

I don't recall the oil pump and timing chain exact details.

(2) bottom of cylinder might need to be notched to clear rod bolts

or use a cap screw equipped aftermarket rod (stronger).

(3) Custom piston to accommodate the longer stroke, pin higher in

piston and less dome to offset increased swept volume.

I did find a site that had a limited amount of information and some pictures. http://rides.webshots.com/album/567477205xgVccB

there is also a thread in the archives under 2.3 stroker I believe

A week or so ago I asked about the S14 deal while talking to the guys at Ireland, they were not encouraging saying the expense was in their opinion too high for the net gain.

So I am thinking maybe Scat cranks for a bigger stroke yet.

I really need to get an M10 core in my hands and see what the exact dimensional limits are.

Or maybe just put a Whipple screw blower on it and forget the stroker.

I should just leave it alone, it runs too well, oh well why change now.

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  • 4 years later...

I was just discussing the availability of a stroker kit with another member and he mentioned that Metric Mechanic used a offset ground M10 crank and VW rods and pistons for their big-bore engines. If using M10 crank no front case or oil pump mods required.

1975 Polaris 2002 (RAT 02E), 1962 mini Cooper S

1994 Land Cruiser - expedition vehicle, 2012 VW Touareg TDI.
2002 restoration blog - http://rato2e.blogspot.com/

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FYI, yes as a matter of fact, MM has also used the S14 2.5 crank in the M10. Bo Black went for a ride in an '02 so equipped during a visit to their shop and said it was pretty impressive.

Budweiser...It's not just for breakfast anymore.

Avatar photo courtesy K. Kreeger, my2002tii.com ©

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I've had an M10 stroker with the Sport Evolution 87 MM Crank for 10 years or so. With 92 MM pistons it has 2313 CC of displacement. The only mods are the front crank seal which is the same as for the 84 MM S14 crank and some minor clearancing of the block on either side where the rods would contact the block without the mods. Use the same 318/M3 oil pump, same chain drive for both pump and cam, same shims for the oil pump. May need to clearance any oil scraper designed for the standard 80 mm crank as you will now swing out 3.5 mm (.140) further with the bigger crank. Bearings are also the same as any other M10. Rods are or can be the same as the standard M10. Pistons will be custom so pin height and compression will work.

 

  

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73 2002 Tii Sold

71 2002 Ti Vintage racecar

84 BMW 325 E-Prod racecar Sold

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Thanks everybody (5 years late, sorry). I found an 84mm Crank at a price I couldn't refuse. The engine has been together for quite a while now and it runs really strong. Puts a smile on my face every time I drive it.

Edited by allbim

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

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