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Maximum Outboard Horsepower Capacity (Guide and how-to)
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<blockquote data-quote="wired" data-source="post: 287139" data-attributes="member: 10188"><p>There are other difference with the 150/105 mercury motors that just the bolted on jet pumps. The 105 motors have considerably higher ports than standard 150's. much lower compression and are equipped with 5600 RPM rev limiters. I have a fresh rebuilt 2.0 liter 1996 150/105 that I changed the lower to a standard prop lower. Cranking compression was 95 lbs. I milled enough material off the heads to drop the heads CC to 28 CC from 38 CC and still the compression is only up to 110 lbs. The ports are so high its very difficult to build high compression. On the other hand with the high ports it will push a 23 pitch prop to 65 MPH at 6000 RPM.</p></blockquote><p></p>
[QUOTE="wired, post: 287139, member: 10188"] There are other difference with the 150/105 mercury motors that just the bolted on jet pumps. The 105 motors have considerably higher ports than standard 150's. much lower compression and are equipped with 5600 RPM rev limiters. I have a fresh rebuilt 2.0 liter 1996 150/105 that I changed the lower to a standard prop lower. Cranking compression was 95 lbs. I milled enough material off the heads to drop the heads CC to 28 CC from 38 CC and still the compression is only up to 110 lbs. The ports are so high its very difficult to build high compression. On the other hand with the high ports it will push a 23 pitch prop to 65 MPH at 6000 RPM. [/QUOTE]
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Maximum Outboard Horsepower Capacity (Guide and how-to)
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