cylinder heads and compression ratios
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Posted by: david targhetta 01/17/2002, 21:08:06

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 ?

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Re: cylinder heads and compression ratios --- Fred H ( 01/17/2002, 21:56:53 ) ( 1158 bytes ) +1 Re: cylinder heads and compression ratios --- david targhetta ( 01/17/2002, 22:12:44 ) ( 1472 bytes ) +1 Re: cylinder heads and compression ratios --- Fred H ( 01/17/2002, 22:46:40 ) ( 2606 bytes ) +1 Re: cylinder heads and compression ratios --- Thack ( 01/17/2002, 23:18:10 ) ( 267 bytes ) Re: cylinder heads and compression ratios --- Ken Merring ( 01/17/2002, 23:52:13 ) ( 766 bytes ) +1 Re: cylinder heads and compression ratios --- Fred H ( 01/18/2002, 07:49:19 ) ( 1728 bytes ) Re: cylinder heads and compression ratios --- 74merc ( 01/18/2002, 00:26:05 ) ( 930 bytes ) Re: cylinder heads and compression ratios --- rickyracer ( 01/18/2002, 16:28:48 ) ( 387 bytes ) Re: cylinder heads and compression ratios --- david targhetta ( 01/18/2002, 19:46:36 ) ( 365 bytes ) +1 emissions --- rickyracer ( 01/19/2002, 12:28:08 ) ( 458 bytes )