My Engineer mate and I have just finished putting together an experimental 1000 BMW motor to replace the 900.
The idea was to use as many stock parts as possible as they were around and have some fun
machined 3m off the base of the cylinders.
machined a 1.5 mm squish band in the piston crown.
This has been done following the process given by a successful German tuner.
K line liners and a 3 angle valve job
stock 308 cam
A couple of questions?
My engineer mate says rings don't need gaps at 120degrees as they rotate.
The nikasil bores do not need any deglazing
rings do not need oiling just a bit on the skirts
He says start it up run at idle for minimum time and then load it up to bed the rings in.
Obviously it works as thats how we did the last engine, how come not every one agrees on that process?
Should be interesting to see in a couple of weeks how it compares on the track to the old 900 that has a 336 " sports cam" and 1mm off the heads.
Hoping for more midrange and punch out of corners as thats where the Brit bikes have it.
The 336 cam had bugger all below 4000, and just comeing on strong when the rev limiter kicked in at 8000.