This is a low cranking compression, especially when you compare it to engines like the ZZ4 350ci/345hp crate engine that makes around 190 psi or the current HT 383 with 9.1:1 compression and a big ...

Lianlian Lin, Zhe Wang, Pengfei Zang, Compression Ratio Control of Free Piston Linear Generator with In-Cylinder Pressure Feedforward, SAE International Journal of Alternative Powertrains, Vol. 7, No.