Stan Weiss
Member
ok the dynamic is 3.75 on one. so what. and 4.14 on the other. those are not my specs. not even close.
i fail to understand what you have demonstrated. who is this aimed at? if me, then here we go again.
Bill I am just trying to see what your sim is telling you
4.14 DCR with a IVC 74 ABDC started with a 5.43 SCR
3.75 DCR with a IVC 74 ABDC started with a 4.88 SCR
4.14 DCR with a IVC 79 ABDC started with a 5.69 SCR
3.75 DCR with a IVC 79 ABDC started with a 5.11 SCR
If you start with 9.0 SCR will have
6.67 DCR with a IVC 74 ABDC
6.35 DCR with a IVC 79 ABDC
So either you are giving the sim different numbers than us or something is wrong.
I would like to add that the above numbers are for a 4.6L and a 5.4L will only change them by about 0.02 each.
I have also a attached a graph of dynamic compression ratio verse Intake valve closing ABDC this is for a 5.4L. With a SCR of 9.0:1.