Hi,

I hope some people can help me out here.

I have a Pursuit 24 (aprox. 5000 lbs.) walkabout with 2 x 115 HP
Yamaha 4 cycle outboards.
3500 RPM show about 18 kts (GPS).

I am just wondering what a good cruising engine speed would be for
decent engine life. I have heard everything from 3500 to 6000!

Thanks,

On Fri, 29 Apr 2005 19:26:16 -0400, Hans wrote:

Hi,

I hope some people can help me out here.

I have a Pursuit 24 (aprox. 5000 lbs.) walkabout with 2 x 115 HP
Yamaha 4 cycle outboards.
3500 RPM show about 18 kts (GPS).

I am just wondering what a good cruising engine speed would be for
decent engine life. I have heard everything from 3500 to 6000!

Thanks,

I cruise comfortably at about 75% of WOT, or about 3500 rpm.
--
John H

"All decisions are the result of binary thinking."

John H wrote:
On Fri, 29 Apr 2005 19:26:16 -0400, Hans wrote:


Hi,

I hope some people can help me out here.

I have a Pursuit 24 (aprox. 5000 lbs.) walkabout with 2 x 115 HP
Yamaha 4 cycle outboards.
3500 RPM show about 18 kts (GPS).

I am just wondering what a good cruising engine speed would be for
decent engine life. I have heard everything from 3500 to 6000!

Thanks,


I cruise comfortably at about 75% of WOT, or about 3500 rpm.


Try for about 1/2 to 2/3 of WOT on the lever itself with a fixed pitch
prop, this should yield about 75% of max revs as John suggests.

Play around till you find the sweet spot for your engine/boat.


K

& the Krause lie for the day is an oldie but a goodie:-)

So this lying idiot sees himself as circulating in the upper
circles, honestly this lying idiot thinks this is believable, which is
more proof of his total stupidity:-)

As far as your other complaints, well, almost every president in
my memory, and I *remember* Truman, Eisenhower (who cheated on his
wife), Kennedy, Johnson, Nixon, Ford, Carter, Reagan and Bush, lied and
participated in deceit to one degree or another, and on issues far more
important than who was giving them blow jobs.

Good lord. I met *every* president in the damned group except
Bush, and I worked once for his father.

On Fri, 29 Apr 2005 19:26:16 -0400, Hans wrote:

Hi,

I hope some people can help me out here.

I have a Pursuit 24 (aprox. 5000 lbs.) walkabout with 2 x 115 HP
Yamaha 4 cycle outboards.
3500 RPM show about 18 kts (GPS).

I am just wondering what a good cruising engine speed would be for
decent engine life. I have heard everything from 3500 to 6000!

Here's my opinion which has worked very well for me with my boats
which have all been outboards.

Bring the boat slowly up until you are planing. There should be a
jump in rpm as soon as the boat is trimmed out and planing properly.

That's where your boat is going to be the most efficient. Bring it up
another 300 RPM or so and that should be a very nice cruise speed.

There is a viewpoint that says WOT is the most efficient, but I can't
seem to make that connection with my outboards. With mine, 2/3 of the
available RPM is both the most efficient and the most comfortable.

Later,

Tom

On Sat, 30 Apr 2005 00:29:27 GMT, Shortwave Sportfishing
wrote:

On Fri, 29 Apr 2005 19:26:16 -0400, Hans wrote:

Hi,

I hope some people can help me out here.

I have a Pursuit 24 (aprox. 5000 lbs.) walkabout with 2 x 115 HP
Yamaha 4 cycle outboards.
3500 RPM show about 18 kts (GPS).

I am just wondering what a good cruising engine speed would be for
decent engine life. I have heard everything from 3500 to 6000!

Here's my opinion which has worked very well for me with my boats
which have all been outboards.

Bring the boat slowly up until you are planing. There should be a
jump in rpm as soon as the boat is trimmed out and planing properly.

That's where your boat is going to be the most efficient. Bring it up
another 300 RPM or so and that should be a very nice cruise speed.

There is a viewpoint that says WOT is the most efficient, but I can't
seem to make that connection with my outboards. With mine, 2/3 of the
available RPM is both the most efficient and the most comfortable.

Later,

Tom

Now we're getting a range from 67-75% of WOT. That should help a little!
--
John H

"All decisions are the result of binary thinking."

Just looked up a couple of reviews for boats with the 115 HP Yamahas.
One "cruised" at 4000, the other at 4200.

If you're happy with the performance at 3500RPM why push it?

Once you're up on plane it is generally safe to assume that going
faster will use more fuel.

I can "cruise" my Merc from about 3600 to 4200. Lowe rthan 35/36 and it's
not at a full "easy" plane. Past 4200 you can hear it starting to drink the
gas.

-W

wrote in message
oups.com...
Just looked up a couple of reviews for boats with the 115 HP Yamahas.
One "cruised" at 4000, the other at 4200.

If you're happy with the performance at 3500RPM why push it?

Once you're up on plane it is generally safe to assume that going
faster will use more fuel.

On Sat, 30 Apr 2005 04:45:53 GMT, "Clams Canino"
wrote:

I can "cruise" my Merc from about 3600 to 4200. Lowe rthan 35/36 and it's
not at a full "easy" plane. Past 4200 you can hear it starting to drink the
gas.

-W

wrote in message
roups.com...
Just looked up a couple of reviews for boats with the 115 HP Yamahas.
One "cruised" at 4000, the other at 4200.

If you're happy with the performance at 3500RPM why push it?

Once you're up on plane it is generally safe to assume that going
faster will use more fuel.




Thanks everybody!