engine revs

[searover]

Hi all just a quick questian, asume travelling 3 hours continuousley with a 115 hp 4 stroke if max revs are 6000, at what sort of revs would i be at if driving 3 or 4 hours non stop or does it not matter , only , my son says run it at halfe revs if non stop , would be glad of advice..... regards

[chewy]

If you reduce the revs by a couple of hundred you may lose a couple of knots but your fuel consumption will be alot better.

[jyasaki]

In theory, the engine should handle WOT rpm fine until you run out of gas. As Rover said, your pocketbook probably won't.

Select a comfortable planing cruising speed and let it go at that. If you want better economy, knock the rpms down a bit (but only to a point where the boat is comfortably on plane - struggling on the hump won't save you fuel.) If you want to get there faster, push the throttle forward.

jky

[searover]

Hi, guys thanks for the coments , ok then ill be happy at 3000 revs or lower as i was getting 22knotts at somewhere around there ,,, so then its on the plane then back off as much as i can to stay on the plane ,,great stuff thanks lads ... regards.

[Hightower]

If you have a fuel meter that tells you exactly what the consuption is at any given throttle setting then using a gps to calculate your speed, it will quickly tell you what the most economical cruising speed is.

Otherwise do what I do and close your eye's when you come to pay for the fuel

The outboard should be happy at any RPM providing it's within the recommended range.

[Bigmuz7]

Tbh I've always done about 65 - 80 % of max RPM for best mix of speed and economy for cruising depending on sea and size of hull