![]() |
Originally Posted by fastdonzi
(Post 3714517)
Cruise Speed is an RPM where your Not hurting the motor by running a Long distance at that speed/RPM. Usually about 3500 rpm, anyone who has a cruise rpm much higher than that doesn't grasp the idea. You Can gear & Prop your boat to be fast at cruise rpm, but acceleration and Top speed will suffer.
|
Originally Posted by LaVita
(Post 3714533)
I've thought cruise speed to be 2700-3500 rpm
for Big Blocks, now for the 60 hp Johnson o/b on the back on my 15' Boston Whaler, that is another story |
28 Daytona twin 496 mags
top speed 90 @ 4900 rpm Cruise 70 @ 4000 rpm 37 Spectre twin Yanmar diesels top speed 55 @ 3800 rpm cruise 38 @ 2900 rpm Fast cruise 45 @ 3300 rpm The eliminator had to be going over 50 to ride well, no tunnel spray ect, and fuel economy was the same from 40 to 70 so usual speed was 70. the spectre i usually run around 38 upper 40's if i am in a hurry, I can run those diesels forever at 3400 rpm, but economy is better around 38. I know it's dead slow compared to a go fast but different kind of boat, although it does ride better as you speed up! |
Originally Posted by TexomaPowerboater
(Post 3714792)
415hp / 12 = 34.58 gallons per hour X 2 = 69.16 gallons per hour twin 502's. Looks reasonable, but their carbed motors not mpi.
|
What ever you come up with just keep in mind motors don't like to stay at the same RPM for long periods of time. Move that stick around every now and then.
|
For me and my Baja, cruise speed depends on safety and comfort of passengers.
For my pontoon.....wfo all day long............. "Are we there yet" |
A lot of it depends on the build of the motor. I know mine have a 6100 limiter so I think 4000 or right below is a good cruise....
|
Originally Posted by LaVita
(Post 3714533)
I've thought cruise speed to be 2700-3500 rpm
|
depends on the boat + power. For our 388, 3500 rpms seems to work real well. In the hdrostream, it's about 3000 rpms, but it's a mod-tunnel hull also.
|
It varies for all. I run with twin outboards that do not like low RPM's. My top end is 5900-6100 RPM's, but I cruise at 5400-5700. The motors are made for that. 5 boats ago, I would cruise at 4000 with a Merc outboard. It all depends.
|
| All times are GMT -5. The time now is 02:23 PM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.