Re: [OMC-Boats] Engine RPM and Boat Speed.

Make sure your tach is correct, either using an external gauge (I recommend
the TinyTach), a timing light, or some other mechanism. My tach reads 20%
higher than the engine is actually turning. I think they tend to read high
with age. So perhaps the engine actually isn't running well (misadjusted
carb?) and you don't realize it because of inaccurate gauges.

Ethan

On Tue, 22 Jul 2008, Don Mandelas wrote:

>
> I have a 1967 Evinrude Sportsman boat with the V-6 155 hp engine. On the
> stern drive unit I have installed the 14 x 18 propeller. When the engine
> reaches 3700 RPMs how fast generally should I be traveling across the
> water? It seems lately that I am going slower than normal (about 25
> mph).

-- 
<a href="http://www.engr.wisc.edu/~brodskye/"> Ethan Brodsky </a>