TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Boats
Motors
1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Edstrossner" data-source="post: 372247" data-attributes="member: 15774"><p>The parts catalogue is a good start but I'll be doing some machine work to this block and it helps to know what OMC did in their port placement to get 30hp. </p><p>I'll be squaring the ports with a 1/4" end mill and possibly opening up the passage way from the crankcase to the transfer ports. It's easy work with a Bridgeport mill. </p><p>I also had a friend of mine point me towards the Chrysler 150hp crossflow. They put in a boost port by drilling a large hole in the piston and the transfer port passage. Interesting stuff.</p></blockquote><p></p>
[QUOTE="Edstrossner, post: 372247, member: 15774"] The parts catalogue is a good start but I'll be doing some machine work to this block and it helps to know what OMC did in their port placement to get 30hp. I'll be squaring the ports with a 1/4" end mill and possibly opening up the passage way from the crankcase to the transfer ports. It's easy work with a Bridgeport mill. I also had a friend of mine point me towards the Chrysler 150hp crossflow. They put in a boost port by drilling a large hole in the piston and the transfer port passage. Interesting stuff. [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
Top