Nashx,
Are you still working on this project? If so, lets get to the definition of torque and maybe you can answer your own question. (lets work in indicated so we don't have to worry about friction)
Tq= (ηc*ηt*ηvol*QLHV*ρa,i*(F/A))/4Π
Where
ηc : Combustion efficiency ( this can be affected...