I wanna know what the actual compression increases are with shaving a head.

EX.. shaving 0.010" = .2 Compression increase

that was just a example not sure on the actual numbers.

Dose anyone know the actual figures for this?

 

http://www.c-speedracing.com/h...c.php


You can do the math ( amount-milled x pi x radiud x radius ) to figure out how much chamber volume is lost, or just subtract the numbers you mill it from the stock head gasket thickness in the program to get the same result.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rmcdaniels &raquo;</TD></TR><TR><TD CLASS="quote">http://www.c-speedracing.com/h...c.php


You can do the math ( amount-milled x pi x radiud x radius ) to figure out how much chamber volume is lost, or just subtract the numbers you mill it from the stock head gasket thickness in the program to get the same result.</TD></TR></TABLE>

I was always under te impression that comp. calculator wasn't very accurate.

 

ya i heard that as well. thats why i dont rely on a compression calculator. hoping some reliable engine builders could put there input in on this

 

Your bore size, combustion chamber volume, headgasket thickness, and valve dish size are going to affect this as well. Is everything on the head stock (in terms of combustion chamber, etc) or has it been modified?

Think about it this way. The swept volume by the piston is going to remain the same. That is one factor of the compression ratio. The rest is determined by the factors involving the head. Numbers exist for the stock head combustion chamber volume, so if you do a little research and bust out a basic calculator or even a slide rule you should easily be able to compute this.