M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Swaps, Turbos, Buildups => Topic started by: Valleymotorwerks on July 16, 2010, 11:02:24 PM
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I am in the process of building up a stroker M42. I have used the search function to no avail.. can anyone point me to a thread with the piston / crankshaft machining requirements? I have the ability of mocking it all up and doing it from scratch but why re-invent the wheel?
TIA!
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Interesting.. from the looks of the threads around here it seemed as if everyone and their cousin has done this... Looks like I am reinventing the wheel!
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I think the ticket is the Euro diesel M47 crank with M20/M50 135mm rods and the S52 pistnos. They are pricey though you can get well over 2.0 litres. Not sure about the M44 crank - you'd also need to machine the snout to take the crank angle sensor.
It's much cheaper your way though. Good M47 cranks are usually around $1k.
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This is a quick synopsis:
The real ticket is the M47 crank with S52 piston shaved .71mm but using a 138mm rod. You might have to dish the piston depending on what compression you're looking for but it should put you around 11:1 without. This will give you 2068cc.
Or you can go S50 piston with same 138mm rod and shave off 2.65mm and dish it to whatever compression you'd like. This will give you 2045cc.
Crank nose needs to be turned down to fit crank gear and a second key needs to be cut. You can then go one step further and have the crank lightened as I did. The stock crank is 30lbs and the M47 crank is 35lbs.
Cheers,
~Ralph
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It's much cheaper your way though. Good M47 cranks are usually around $1k.
IIRC they are actually cheaper from the dealer for some reason. Last time I checked they were around $800 new.
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I agree...When I bought mine last year it was $800 in NJ.
~Ralph
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That's a relief...you'll have $200 left over for the ladies!
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the m44 rotating assembly drops right in, Ive been running my m42 with m44 internals for over 2 years (3 years in november)
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Thanks everyone... I bought 11:1 JE S52 pistons. Using the wristpin as a locating tool the S52 piston is already 1mm shorter than the OEM M42 piston. I have decided to weld and offset grind the M42 crankshaft to M44 stroke length...
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OT:
This doesn't happen to be someone from VMW in Racho Cordova is it?
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OT:
This doesn't happen to be someone from VMW in Racho Cordova is it?
Yup, what's up?
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Yup, what's up?
Nothing much. I was just curious as I was previously a customer before I moved out of the area.
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Nothing much. I was just curious as I was previously a customer before I moved out of the area.
Cool, how's HI treating you? I hear the limitiations on mods are pretty strict over there...
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Thanks everyone... I bought 11:1 JE S52 pistons. Using the wristpin as a locating tool the S52 piston is already 1mm shorter than the OEM M42 piston. I have decided to weld and offset grind the M42 crankshaft to M44 stroke length...
you can do that? how?
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offset gring the m42 to m44 stroke?
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Cool, how's HI treating you? I hear the limitiations on mods are pretty strict over there...
Engine mods are unrestricted as is everything else. They are suspension Nazis though. But there are no emissions regs or smog tests here. Way better for modding as opposed to CA. However there is nowhere to use the power on this island. The cops are horrible, the rods are shitty and there is no track.
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Thanks everyone... I bought 11:1 JE S52 pistons. Using the wristpin as a locating tool the S52 piston is already 1mm shorter than the OEM M42 piston. I have decided to weld and offset grind the M42 crankshaft to M44 stroke length...
Thats possibly the silliest thing I have ever heard.
You go buy JE S52 pistons and then cheap out and weld and grind your old crank.
And even at that, your only planning on getting what an M44 crank will give you out of the box?!?
Suppose, I can't really talk though considering my M47 crank was free inside a complete engine that just got burned a little when the cat went on fire:p