themanfrombeantown
New Member
So I decided to derive the piston speed as a function of crank angle. The b16b and b16a are nearly identical, the b18c's are 12% faster at peak resulting in 25% more Kinetic Energy (KE). Most interesting is the load at max rod angle from horizontal. The b16a has 6% more than the b16b, and the b18b 12% more at 90deg from TDC. But remember the 18b is making more torque, so the total load on the side wall is 26% greater for the b18s over the b16b. So basically the cylinder walls and the rods are experiencing ~25% greater stress for the b18c's. And I haven't considered the effect of the increased speed of the b18c's on the lubrication and cylinder wear. The CTR and ITR being nearly identical in build and rev limits, the ITR is a way more stressed engine. Not saying it's not good mind you, it's an amazing engine.