Sparksalot wrote:I admire the dedication of those producing round, straight bores with the correct cylinder surface finish for their purpose. As machinists that's a challenge we can quantify and determine success by accurate measurements.
However, doing it on a cored cast iron production block and understanding what happens when that relatively thin cast iron cylinder sees operating loads from pressure and piston loads are not at all intuitive. Cast iron has a relatively low Young's modulus, it's not particularly resistant to deformation from applied loads. That cylinder becomes a flexy flyer during high BMEP operational loads, it might be round and straight when you measured it but it is far from it during operation. One of the great things about cast iron most people don't know is that it is not susceptible to fatigue. It's immensely flawed at birth, that saves it from fatigue death.
Rings work in those heavily distorted bores if they can bend enough under pressure loads to conform to the distorted cylinder. Race on guys!
All of the draw backs posted above of "cored cast iron production block" leave me questioning
The real benefit of hot honing and torque plate honing.
Does any one have real back to back testing using a torque plate??
I know first hand of a very reputable sprint car engine builder whose engines have won the
Silver crown at least twice stop using his hot honing machine and his cv10 when he got
His new sv21.
He said sense he started using hid sv21 his engines were sealing up faster and making more power.