Reply to thread

Message: [QUOTE="photomd, post: 1117464, member: 72878"] First post for me, so if we get flamed...blame it one me. :) Compression ratio is a simple ratio by volume of your cylinder with the piston at BDC and TDC. So there is 7.1 times more volume in your cylinder with the piston at BDC than at TDC. To me 110 sounds about right. In my mind, compression by a compression tester will depend on the compression ratio. My CR has a ratio of about 8.5:1 and it's been around 135 since I bought it. My airhead BMW with 8.5:1 is 134 and 138 with 2-3% by leakdown testing and I've got a boat with 11:1 that read 156-164 when I bought it. HTH's :cool: [/QUOTE]