As a long-in-the-tooth follower of Grand Prix racing I thought I'd ask a couple of questions in the forum as some of you guys are certain to know the answers. These date from the 60's.
First of all, how did they manage to downsize the Ford DFV engine down from 3 litres to 2.5 for the Tasman series? Was it a simple case of putting very thick liners inside the existing cylinders and adding comparably smaller diameter pistons? Anything else done e.g. to improve the fluid flow in and out of the cylinders? Or was something even more drastic done?
Secondly, how did they do the opposite, e.g Coventry Climax making a 1.5 litre unit into a 2 litre (or thereabouts) unit? I believe BRM and Ferrari did something similar as well. I can't imagine these engines being capable of being bored out to such an extent, and a larger throw crankshaft would seem impracticable.
Or maybe they realy did do one-off specially redesigned engines rather than modifying existing units
I've only been curious about this for about 45 years. Put me out of my misery before I pop me clogs.