Posted by Bobby Then there's the 'e' head. The 'e' chamber is a flat chamber and the pistons are also flat (the 'i' design is superior) so when they are at TDC you get solid compression, and a ratio that is actually higher than an 'i' at around 9:1. So here's the problem with swapping... The 'i' chamber needs a pop up piston in order for it to get the compression ratio it needs to make good power, and the 'e' pistons aren't of that design. When you put the 'i' head on top of a stock 'e' bottom end you are LOWERING the compression ratio, lowering equals bad, lowering equals less power. By doing this the ratio becomes LESS than the 'i' stock ratio of 8.8:1, I believe it's something like 8.4:1.
on 3/1/2005, 7:15 pm, in reply to "Re: Head swap"
68.49.128.158
Hey man i dont think you can just swap the two heads because on the 'i' chamber (head) you have a large, high volume, dome design. This works well on an 'i' block because an 'i' has pop up pistons. When the raised dome piston reaches top dead center (TDC) it fills the dome chamber and results in a compression ratio around 8.8:1. Think of it as two puzzle pieces. The piston fits the shape of the chamber to make a match.
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