Since my engine rebuild to fast road spec, cold starting has been difficult. The engine struggles to turn over which it seems like a flat battery. The battery in my car hasn't been used for 6 months but I have charged it a bit before using it again.
I have to jump start it from cold, but even then it struggles to turn it over but it's just enough! (The jump battery could do with a charge though!)
I'm starting to think it's a weak starter motor due to the new/high compression engine? Would a standard pre-engaged starter be enough to start it?
So I'm either thinking of getting a new battery or high torque starter motor? OR it could be a bad engine earth or ignition timing? The car starts easily when warm though!
Any help is appreciated!