Originally Posted by Will Pedley

Just as a comparison - i looked into making a 10,000rpm revving Zetec and found a suitable crank that would give safe mean piston speeds. I calculated the displacement of the engine using this crank and even on an 86mm bore the largest I could get it was around 1.55 litre. Torque dropped around 20lb/ft everywhere and power was poor at low engine speeds.

Compared to the 2.2 stroker crank i designed that would safely rev to 8000rpm and give around 15lb/ft more torque through the rev range on a theoretically standard engine, there seemed little point in having to uprate the valvetrain and lubrication system to take those extra 2000rpm.