SAFC II Help - 370cc's on a non-turbo KA

[BigVinnie]

Originally Posted by thejester03

But with lower comp. you will have a slightly larger combustion area, not displacement, correct?

Assuming that you mean a lowered dish to increase combustion area.
Increasing the combustion area such as lower CR at 8.5:1 means that the energy output is less than optimal for stock 9.5:1. This means in order to make enough energy that is more effecient to the A/R ratio, fuel would have to be less than if it were at 9.5:1 (more lean than usual), just due to the fact that 8.5:1 compression will compress less air with a much larger combustion area. I don't understand how -27% was calculated to use on a 8.5:1 CR?
8.5:1 is a horrible atomizer for NA, but works great for FI.
Only reason why it works so good on FI is because when air is forced inducted it is already being compressed into the surface area, and is more controlled to too much air being compressed in the combustion stroke. Much safer to use and it uses less fuel to cool the cylinder charge from detonation than what would need to be done with 9.0:1 CR or higher.