Quote:
Originally Posted by Shoomakan
For the record, I have a newfound respect for these engines. I always knew the cars were solid, but the engine is a masterpiece as well. Starting to like it more than an M30... But don't tell anyone! 
Good luck iwrock! I LOVE Tourings, my old E30 was a Touring. Best sleepers ever, and good luck! |
I look at the M103 as a comparison to the early 265/283/327 Chevrolet small block engines.
Simplistic in design and bulletproof which is the foundation needed to build a reliable performance motor.
Start layering on the evolution of the M104...additional cam, VVT, more electronics and emissions...
Out of the box more power.. but IMHO the M103 is a more responsive engine.
The more components and sophistication, the more variables that present problems when you're building a performance engine.
Keep it simple...
Look at American drag cars...antiquated push rod engines with only the needed number of valves per cylinder with a cam sitting down low in the valley...
Making 750-1000HP without the help of electronic fuel injection and ignition control.
Running big old 1100CFM gulpers and magnetos...
Simplicity at it's best....
