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Message: <blockquote data-quote="fabianyee" data-source="post: 85668" data-attributes="member: 6">u can use the M50 3.0 piston but that would required boring the engine block, but that still can't give u much CC. u need a crankshft to increase the stroke.... btw, the Hartge 2.1 stroker kit for the M42 is scientifically known as  "unobtanius familiarus" .. read this *****************The German tuner Hartge once had a 2.1-liter stroker kit for the M42 engine, but today their scientific name is "unobtanius familiarus." They are long gone. You already have pretty high compression at 10.5:1. If your M42 is like most of them, the bottom end is fine even at 170,000 miles, but you need a timing chain, oil pump, and valve job, or at least new lifters, valve guides, and valve guide seals. If you can stomach the expense of a valve job and a set of Schrick cams, that combined with a chip, intake, and exhaust system will yield about 165-170 hp, which is about all you're going to get out of an M42. And it still won't have much low-end torque. Keep the stock cams and do the rest, and you'll wind up with about 150 hp or so. If it's acceleration you're after, your best best is a 4.27 limited-slip differential from a 1991 318i convertible. This is a bolt-in modification, and it won't affect the speedometer/odometer reading due to BMW's electronic speedometer pickup.*****************btw, if u google for "Hartge M42" or  "AC Schnitzer M42", u can find out more..... BTW, the Hartge kit cost 15k from what I read in one of the forums... and the thing is 'got money oso cannot buy'.... and it was rated at 175hp max, is it worth it???</blockquote>

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