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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Lil&#039; Blue Rude" data-source="post: 372386" data-attributes="member: 4627"><p>I think I'd use at least a 3/8 end mill. Using a 1/4 end mill will give you small radius at the corner of the ports and I think that would be pretty hard on the rings. Seems like some of the inline 6 mercs use a boost port. Haven't heard of many good results from porting on these motors. People talked like they made a little more power, a lot more noise and they drank a lot more gas. I'm sure that was porting beyond 30hp specs though. You might look at scream and fly for what they call the "nine pages" it's mods for the om v6 crossflow motors and I know some people have used the same basics steps on the omc v4's.</p></blockquote><p></p>
[QUOTE="Lil' Blue Rude, post: 372386, member: 4627"] I think I'd use at least a 3/8 end mill. Using a 1/4 end mill will give you small radius at the corner of the ports and I think that would be pretty hard on the rings. Seems like some of the inline 6 mercs use a boost port. Haven't heard of many good results from porting on these motors. People talked like they made a little more power, a lot more noise and they drank a lot more gas. I'm sure that was porting beyond 30hp specs though. You might look at scream and fly for what they call the "nine pages" it's mods for the om v6 crossflow motors and I know some people have used the same basics steps on the omc v4's. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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