the 325iS: December 2011

M44 block bored out to 86mm to accomodate the Euro S50b30 pistons

Pistons: Left M42, middle S50 (decked), last STD S50

Euro S50b30 pistons decked 3.8mm and pocketed

Pistons: Left M42, middle S50 (decked), last STD S50

M44 connecting rods with custom small-end bushes....M44 rods are lighter than M42 connecting rods and contrary to popular belief they are forged)

Stock M44 big-ends and main bearings
Fully balanced bottom-end
Lightweight flywheel

Here's the rods: Left M42, next M44, next M47, las

M47 (E46 320d) crank with 0.5mm machined nose so the pulleys fit NOTE - One important thing about the crank swap... The M47 keyway is closer to the snout of the crank than for the M42/M44. The stock key location on the M47 crank engages about 1/8" only of the M42 timing chain sprocket. You need to either have another keyway slot cut into the crank (best) or extend the key father back so that it engages more of the sprocket..."There's no replacement for displacement." This diesel engine crank increases the stroke by 8mm and displacement by 8.5%. You'll increase torque as well with the now longer 88mm stroke.

This high output configured engine has a Stock M42 head, so far, head work and Cams would obviously increase HP in addition to these significant bottom end upgrades.

AFM to 3" MAF conversion (E36 328i MAF) the engines found on E30's use a MECHANICAL component called a AFM (air flow meter) to measure the amount of air going throw the intake. In this way, the computer can calculate the amount of fuel to inject in each cylinder. They stop using this AFM component around 1992. While there is some dispute regarding when the AFM was removed from production and when the MAF began [it is thought by some that BMW didn't switch to the MAF until the M44?], they replaced the AFM with a MAF (mass air flow meter) which is an ELECTRONIC component used to measure the amount of air going throw the intake.

http://forums.bimmerforums.com/forum/showthread.php?t=433471&page=13

This is the diagram for the AFM to MAF conversion.

80 degree thermostat
Custom 6mm duraform spacer gasket for intake manifold (keeps intake mani ice cold)
Stock M42 header, so far
TB water line delete
Euro M3 injectors
Fan delete mod
Dastek unichip
CAI
11,6:1 compression
Current rev limiter @ 6750rpm

Future Modifications:

Euro M3 ITBs
Euro M3 solid lifters
34mm intake valves
Gasflowed head
Bigger cams (don't know how big yet)
Custom header (4-2-1 48mm runners)
Up rev limit to 7500rpm

These S50B30 throttles bodies will be later fitted to another cylinder head. Still need to get another M42 head which will be gasflowed, bigger valves, better valvetrain, solid lifters and custom billet cams. The intention is to use the first two and last two throttle body sets. The fit to the head is like the ITB:s was intended for the M42. Additionally, S50B30 plenum chamber, ram tubes and rubber boot for the MAF. The builder will cut cylinders 1 and 6 off and weld it closed. Its made of aluminum.