Dynamic Compression and Aluminum Heads?

JGC403 said
I know this has been discussed a lot on here, but I wasn't able to find an answer for my question.

With aluminum heads they say you can generally raise the static compression ratio 1 point because the aluminum dissipates heat quicker.

Now when you are inputting all of your variables into a dynamic compression ratio calculator what compression ratio would you put for aluminum heads.

SO lets say your calculated compression ratio is 10:1, but you are using aluminum heads so it basically has 9:1 compression ratio.

In the dynamic compression ratio calculator do you input your calculated 10:1 ratio or your "effective" 9:1 ratio for aluminum heads?
Click to expand...
10.1 is 10.1.

The head material difference is in heat dissipation/transfer/weight.
Dynamic # requires a intake closing event to calculate effectively giving the compression seen in the end of it.

You could run around 11.1 static compression , but dynamic psi usually must be below 9.1 or you'll detonate on most pump gas. The cams intake closing degree 'early or late' will decide how 'high or low" that is.