I have an ex-defender 2.5 petrol engine in my series 3 and am considering tuning it up a bit. In the technical section of this months LRO it says that the 2.5 petrol camshaft is 'tamer' than that fitted to the 2.25, can anyone elaborate on this. Does the 2.25 cam have a higher lift and therefore give a bit more power or should I simply buy an aftermarket 'warm' cam?
Also I want to raise the compression ratio from 8-1 to 9-1 and I've heard that this will require 1mm to be skimmed of the head, is this correct?
I am also considering gas-flowing the cylinder head and fitting a larger bore exhaust, the engine is already fitted with a new [correct] twin-choke weber carburetor. Any comments or ideas.
Also I want to raise the compression ratio from 8-1 to 9-1 and I've heard that this will require 1mm to be skimmed of the head, is this correct?
I am also considering gas-flowing the cylinder head and fitting a larger bore exhaust, the engine is already fitted with a new [correct] twin-choke weber carburetor. Any comments or ideas.