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<blockquote data-quote="Pappy" data-source="post: 212378" data-attributes="member: 3278"><p>Right on the money, Cajun. </p><p>Another good example of compression changing throughout the years would be in the OMC crossflow V-4 line. The older 115s and 135s had compression up in the 120s, 130s or higher but the later model engines designed to run on lead free low octane fuels went all the way down into the 90-100psi range. </p><p>Some of the OMC Looper V6 engines have staggered compression as well meaning that cyls #1-4 will have higher compression than cyls 5-6 will. Also the numbers will be different bank to bank. The standard for compression these days is and has been that overall, the cylinders should read within 10% of eachother whatever the reading is. That takes the differences in model years, engine models, brands, and compression gauges out of the game.</p></blockquote><p></p>
[QUOTE="Pappy, post: 212378, member: 3278"] Right on the money, Cajun. Another good example of compression changing throughout the years would be in the OMC crossflow V-4 line. The older 115s and 135s had compression up in the 120s, 130s or higher but the later model engines designed to run on lead free low octane fuels went all the way down into the 90-100psi range. Some of the OMC Looper V6 engines have staggered compression as well meaning that cyls #1-4 will have higher compression than cyls 5-6 will. Also the numbers will be different bank to bank. The standard for compression these days is and has been that overall, the cylinders should read within 10% of eachother whatever the reading is. That takes the differences in model years, engine models, brands, and compression gauges out of the game. [/QUOTE]
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