Stopping the knock: Lower compression and ported heads...

RustyRatRod said
That's the funniest thing I have read throughout this entire fiasco. What do you think that will do to cylinder pressure? You will be right back in the same boat as before lowering the compression. If you're serious about that statement, you may as well sell the car now because your ability to learn from your experiences is naught.

With the engine now at 10.07, I have some room to work with. At the previous Cr of around 11.0, I was against a wall in terms of what cam I could run. I've plugged numbers into the Dynamic calculators to see what effect the intake closing has on the Dynamic ratio. The static compression has a far greater effect on the Dynamic reading than the intake closing. I'm not saying that Intake closing isn't important, just that the static CR is more so.

Check this out:

Previous setup with the 11.0 CR and 509 cam, Dynamic was 8.17.
With the same CR and the Lunati cam, Dynamic was 8.29. With the current lower 10.07 CR, the Dynamic is now down to 7.61. If I had this 10.7 ratio with the 509 cam, I'd be at 7.51.
Got me so far? So.... in order for me to get back into the "Red-Zone" of detonation, I'd have to go with a cam mild enough to have an intake closing of 64 degrees or lower. This is calculated by using the following calculator:

https://www.uempistons.com/index.ph...=comp2&zenid=5886b5a1e26a6addce30f95974e64ff7

I'm going to check Comp cams site to see what a cam looks like that has a 64 degree intake closing.