Posted by: Fred H
01/17/2002, 21:56:53
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My engine has a compression ratio of 8.1:1 (its a '77) and i feel that it is too low to get good performance, but I am not sure. DOes anyone have an opion that would help me figure out whether or not this is low. Also, what size of combustion chambers are you guys putting in your 6 to 8 swaps. The shop manuel i have says mine are between 67-70cc is this correct? If I mill the heads is it possible to raise my compression to about 8.5:1 to 9.0:1 ? ************************************************************
Dave, you are right. 8:1 compression is much too low for any sort of performance. I say time and time again that compression=power. The cheapest and easiest way to bump up compression (assuming that you do not want to switch out pistons) is to install a set of closed chambered heads (like the old 289 heads w/ a 53cc chamber) and run the thinnest possible head gasket. I am not sure exactly how much that will give you, but it will surely be at least another point or so and whatever it is will certainly be streetable. I am sure someone else (like Ken or rickyracer) can give you a more accurae picture of what our final CR will be.
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