Carver Owners Forum

twin 305's, 230 hp on 28' voyager. What is a good cruising rpm? Engines have 1550 hrs.

I have the same boat with twin 230 Mercruisers and usually cruise at 3200-3400 rpm at 22-24 mph.Engines currently have 400 hours.

I have heard most people stick around 3200-3400 with all the v8. I have the 454 and I cruise between 3200 and 3400 which is about 20-22 mph. Anything less than 3000 and I feel like its struggling to stay on a plane.

Thanks for the info. While I'm at it, what engine temps & oil pressure @ criuse do you see?

We have a 36 Carver aft with 454's. We go slow most of the time between 1500-2000 rpms (to be easy on equipment) @ around 10 mph. Sometimes cruise at around 3400 rpm and 23 mph not to often though.Our temps stick around 160 no matter how hard I am running them. Oil is around 60 psi.

Port temps stick at 160 and stbd 168. Closed cooling.

We have two "sweet spots" in our 350 mariner with 350MPI's.
When want or need to go along at a trawler like speed 2000 RPM will push us along at 8 to 8.5 knots and the boat seems very happy there. The other nice one for this boat is 3000 with a fair amount of trim tab engaged. This will give us 14 to 14.5 knots and a very comfortable ride depending on the conditions. Both of these rates give us very similar fuel mileage.

Cheers
Fraser

my 355 with mercury 454's likes to cruise at 3400rpm @ 25 mph +/- depending on the wind. Usually about 175 degrees F, 55# oil. Tabs always up.

Tom and I have the same boat and engine configuration and I (and the boat) like 3200 t0 3400 RPM. Boat runs at 19 to 21 MPH indicated on GPS. Closed cooling system temp = 180F gauge and oil pressure 60# gauge readings. I'll assume prop and trans. gear ratio are the same. I also run tabs up. I don't have any fuel in rear tank and the boat doesn't need any tabs to plane nicely.