Thanks no problem.
The main point to emphasize with this engine is blueprinting - it was initially thoroughly checked and unfortunately many of the parts didn't meet the standards (very high) necessary for The builder to be happy with it. This despite it being rebuilt when the car was restored 5000 miles ago (another lesson learned!)
Given we were now getting serious I said we'll it would be nice for it to make a little more power as long as it ran/ idled and behaved like an original. We discussed Alpina B2's and aimed for that.
It has remained a 3.0 for two reasons,
1) I think a 3.0 CSL should have a 3.0 engine in it and
2) they agreed with number 1!
We ended up with:
- pistons at 11.25:1 actual compression set out the top of the block.
-redesigned and cnc machined combustion chambers
- new valves, guides, cnc rockers
- ported inlet and matched manifolds
- custom cam giving more lift (circa 10mm) at the valve than those currently available from schrick for the road.
- modified oil pump
- lighter flywheel and clutch
- new crank and shells (old one was deemed ok but not perfect for this case)
- fully rebuilt and checked 45's not sure on final chokes but they started with 38's on the dyno.
- all other parts replaced with genuine BMW ones.
- it is currently awaiting a new manifold as fritz bits one i had is absolutely rubbish for power. This is being designed and built in two weeks time so hopefully power figures are likely to change slightly for the better.
Nevertheless it made an amazing 261bhp at 6100 with 250ft lbs of torque. The amazing fact is that it makes the standard 200bhp at a little over 3000rpm!!.
The engine starts on the button, takes full throttle from a standard idle and has a near perfect lambda at all rpm's - I can't wait for the weather to improve!
Once the new exhaust is on and we have retuned for that I will post any final changes.
