Decking A 4k Head

[archangel62]

  tojo2 said:

Credit for making an effort, but sorry mate: You got the blah blah bits wrong. Take a look at a 4k compression chamber. :yes:

 

If you want to do this accuratly, measure the cc of the combustion chamber , thickness of your compressed headgasket, and calculate what comp.ratio

you got. Then you calculate how many cc you need it to be for your wanted ratio. Subtract and you got how many cc you want to get rid of.

 

Now figure out the surface area of head combustion chamber and calculate how mutch you need to shave.

 

Yep good advice, I'm more than happy to be corrected ;). Can't say I've ever had a look at a 4k combustion chamber. For 9.4:1 though, the compressed cc of head+piston would be 34.3cc... Just divide 322.5 by your desired CR... The difference between that and 34.3cc is how much you have to reduce the cc in each head cup! :dance: Btw cheers to Toy Yoda for the stock CR! And yesh, you can has a cookie XD

 

So, the max, I say, is reducing by 3.59cc/cyl, for 10.5:1, or 5cc/cyl for 11:1. A head dude should be able to get that reasonably accurate! But remember, once you've done that, you're screwed if you have to get the head faced again to get imperfections out when putting on another engine/etc.

Edited September 23, 2008 by archangel62