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
Johnson 9.9 vs 15 rpm question
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="Gotem" data-source="post: 373723" data-attributes="member: 9901"><p>I know the 76 through 93? models were basically the same motor with the exception of the carb, exhaust tube and a shim. I also realize the rpms of the 9.9 were set about 1000 less than the 15 in which the carb provided the extra ponies. My question is this, with these motors basically identical is there any danger to have a pure 9.9 and put a prop on it with a smaller pitch (I think you can get it as low as 6) to increase the RPMs into the 15 hp range? Has anyone actually tried to do that and what are the results? </p><p></p><p>I am not going to try this (I have a 15 hp carb installed), I am just asking for curiosity sake.</p></blockquote><p></p>
[QUOTE="Gotem, post: 373723, member: 9901"] I know the 76 through 93? models were basically the same motor with the exception of the carb, exhaust tube and a shim. I also realize the rpms of the 9.9 were set about 1000 less than the 15 in which the carb provided the extra ponies. My question is this, with these motors basically identical is there any danger to have a pure 9.9 and put a prop on it with a smaller pitch (I think you can get it as low as 6) to increase the RPMs into the 15 hp range? Has anyone actually tried to do that and what are the results? I am not going to try this (I have a 15 hp carb installed), I am just asking for curiosity sake. [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
Johnson 9.9 vs 15 rpm question
Top