Jono51 58 Report post Posted January 29, 2013 have had some interest in people stroking facelift m20b25's out to 2.8 makes a nice torque engine, leaving the engine bay looking stock, no mucking around with different engines , mounts , gearboxes and grafting looms being offered to bimmersporters is : 2.8 crank from M52 6 suitable rods Retail $450 Bimmersport buy $350 the lot 2 kits available can freight nationwide for additional be in quick cheers J & K 043801089 Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted January 29, 2013 (edited) mods please move to for sale section please Edited January 29, 2013 by JKSE Quote Share this post Link to post Share on other sites
BMWTouring 20 Report post Posted January 29, 2013 will this suit an M20B20?? Cheers Quote Share this post Link to post Share on other sites
Lucan 196 Report post Posted January 29, 2013 You need 2.5 pistons, since you have the correct rods I'm sure you can work a deal Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted January 29, 2013 (edited) will this suit an M20B20?? Cheers no for m20b25 have an m20b25 block available if you do need one for additional Edited January 29, 2013 by JKSE Quote Share this post Link to post Share on other sites
Jono51 58 Report post Posted January 29, 2013 You need 2.5 pistons, since you have the correct rods I'm sure you can work a deal 2.5 pistons will not fit the m20b20 m20b20 has a 731 head , where as the 2.5 is 885 yes rods correct Quote Share this post Link to post Share on other sites
Lucan 196 Report post Posted January 30, 2013 Ahh late night posts, was only thinking about internals. My bad Quote Share this post Link to post Share on other sites
MD13 459 Report post Posted January 30, 2013 Hey sorry if these are dumb questions What sort of HP gains are we talking about? Do you 'lose' anything as a result (e.g. torque)? I read somewhere that the crank needs to have some machining done for a belt or something if going into a M20... Has the crank in your sale been altered? So to fit I'm thinking: the engine needs to come out and disassembled bottom end bit's swap and assume new rings? Head skim and new gaskets Maybe cambelt and tensioner engine back in and new fluids then ecu remap required? Sorry for all that... Been thinking for a while now a little more power would be great and $350 is a good price from what I've seen but I suspect I'd be looking at the wrong end of and additional $1k for tuning, additional parts and machining on top right? Quote Share this post Link to post Share on other sites
Lucan 196 Report post Posted January 30, 2013 You need a "spacer" machined up as the cranks diameter is smaller at the seal. It's just a dounut really. There are exact specs if said dounut out there.. I've read that there are 2 types of m20 pistons you can use though, the earlier type needs a bit if work as it doesn't quite clear the crank. I've got a 2.8 assembly together and needed the spacer on top on new rods Would be safe to get new bearings, rings and seals. Can be done from underneath too, don't have to remove engine. Tune would be good but Ray told me you can run on 98 octane without. Quote Share this post Link to post Share on other sites
Nobimmer 694 Report post Posted January 30, 2013 I got 170HP at the wheels on Gavins dyno, cant remember what the torque number was. That was with a remap from Gavin and headers, cold air box etc. I did new everything in the bottom end while it was out and left the top end stock (including cams) Quote Share this post Link to post Share on other sites
