Originally Posted by willwren
It'* not about the voltage or motor size. It'* about the current in amps that your alternator produces. A motorcycle can jumpstart a big block if it charges long enough.
Let it idle-charge for about 5 minutes, then crank.
My 160 amp alternator will crank any car immediately, but a 105 amp alternator on an SE will have to charge first for a couple minutes.
I guess I didn't use the correct terms, but this is what I was talking about. Engine displacement is insignificant when jump starting... it'* all about how stout the alternator is. Thanks for the clarification.