Lightened crankshaft for m42 m44 stroker

[max321]

Yes, this is possible.

[Brian318is]

Interested in the stroker kit. What is the final compression ratio? What would be the final displacement? Would this setup be suitable for a street car, or is this more for a race application?

[max321]

We have applications, compression ratio can go from 11.5-12.5 with 88mm  stroke and 87mm pistons, in this application original con rods can be used. Pistons are not forged but are very strong and lightweight, witch is perfect for street use. this combo gives 2093ccm. Other combination is with forged pistons 85mm, this can also be used with original con rods, but we offer forged aftermarket con rods. This combo gives 1997ccm. Compression ratio can go from 11-11.7 This is more race oriented, do to forged pistons and keeping the displacement under 2000ccm.
Last combo is also forged and lightened crankshaft but stroke is 83mm and 87mm pistons. This gives 1974ccm.
We can recommend compression ratio witch is most suitable for your needs.

[Brian318is]

My intention is to build a 2-2.1 stroker. I have been looking into the various options, such as the m47 crank and s50 pistons. The m47 crank has an 88mm stroke, which is what yours is offering. Also, your crank is lightened to 28lbs, a savings of 11lbs? Is your crank a machined m42 crank? I would actually prefer the forged pistons, however would an 86mm bore instead of an 87 be optimal? From what I've read, an 88mm stroke (m47 crank) and 86mm bore (s50 pistons, shaved 1.5mm) would result in nearly 2.1l and a near stock 10.5-11 compression ratio. If that's the case, I may just buy your crank and then shave the US s50 pistons myself, unless you have forged pistons that you use and would recommend.

This is mainly going to be a street car, driven 3-5 days a week with some eventual autocross involved. My m42 just died and if I'm going to rebuild it, I might as well do it right. What would you suggest?

Also, you said that your power numbers would be run in March. Have you had any dyno results? Do you have a picture of your machine process? Pics of any installations that you've done?

[max321]

Yes, crank is lightened for about 11lbs, it is not reworked m42 crank, that would not be possible to do. Well, there is no optimal setup, with 87mm pistons and good head gasket setup works fine.  As we have no access here to us pistons s50 i dont have any specs. If pistons are shaved flat that would probably end up with commpression ratio bigger than 10.5-11. We dont have forged pistons 86mm to recomend, s54 s50 euro forged pistons can work but have to be shaved more than 4mm. It would probably work with these 86 us pistons, however we recomed our 87mm lightweight pistons. No dyno numbers for now, i can send you some photos of our engines. I will send you photos. If you have some more questions feel free to ask.