Chem. Reaction and Ignition Setting in ICE Problem

Tulus

Dear All, I am performing a computation of temperature during one cycle in a two-stroke engine using Star-CD v 3.22. I used the Star-CD Manual Chapter 9 to set the chemical reaction and the iginition. I included the setting into the ICE problem from the manual Chapter 13.1. But, I think the result is not appropriate with respect to the result of the same problem of chapter 13.1 without the reaction and ignition. The presure of chemical ignited chemical reaction during after ignition was lower then the problem without ignition one.

Can anyone help me to get a suggestion for this proble?