 compression ratio question, Type 4 going in a bus |
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| malcolm2 |
 Jun 17 2020, 10:01 AM
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Advanced Member  Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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I am shooting for 7.3 CR on this build up of a 1.8 to a 2.0. I have been measuring and calculating like crazy.
I did each piston's deck height in 4 places. putting more trust in the deck height at the pins (9 o'clock and 3 0'clock) 12 o'clock and 6 do show some rocking but I kinda average the rocking. Question: should I shoot for a # calculated as UNDER my goal and figure the torquing will squish me closer to my goal? 0.03 shim CR results by cylinder: 7.41, 7.38, 7.28, 7.37, respectively. 0.04 shim CR results 7.27, 7.24, 7.14, 7.23, respectively. #3 is usually the hottest, so I am assuming since it's CR is lower, it may even out the heat....maybe? am I obsessing? Over thinking? It is just a daily driver Bus. (IMG:style_emoticons/default/shades.gif) Camper Specials with 55.2 total CCs. Dished bus pistons with 10 CCs. using no shim average DH as 0.0253, .0273, 0.0345, 0.028, respectively. |
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