Yanmar verses Cummins

ckollerer · Posted: Sun Sep 21, 2008 6:45 pm Post subject: cummins 150 hp

Just a post from Lake Powell, where we had two Ranger 25 tugs, both with the Cummins 150, at the C-Brat gathering of 20 boats. For myself, I am totally satisfied with the performance of my Cummins 150. I have topped out at 22 mph, but generally stay more in the mid- to high-teens in mph. I have not yet filled the 75 gallon tank full and had my fuel consumption exceed 2 gallons per hour for the whole tankful, despite a blend of high speed, low speed cruising and docking manuvers. Blue Bayou

IdleUp · Posted: Sun Sep 21, 2008 8:08 pm Post subject:

Wow - can I buy just about 2 square inches and stick it in my ears? Laughing

thataway · Posted: Sun Sep 21, 2008 11:10 pm Post subject:

The really telling number on Tom's web site between the 130 and 150, is at 3000 RPM--the 150 is 15.5 knots, the 130 is 12.3. At 15.7 knots the 130 is turning 3500 and burning slightly more fuel. As you load the boat, the speed will decrease some-so the difference will be even more. In my mind I would get the 130 if I wanted to cruise in the 8 to 10 knot range, and the 150 if I wanted to kick it up to 15 to 17 knots. It will be interesting to see what "real life" fuel consumption will be. Many of the tests are optimistic because of light loads and absolutely clean hulls.

Considering the space around the genset, problably 1" thick foam would be enough. The real difference with this type of insullation is the double foam, with mylar on the surface and the vinly impregnated lead in the middle. We used to use actual lead, nailed to 3/4" plywood, and then foam/mylar inside. The combination vinly works as well and is easier to work with. We made complete 3/4" plywood boxes for both the main engine and 8 kw genset on our Cal 46. This vs an already insullated walk in engine room, with the Home depot type of insullation. The vinly foam, brought the sound down so you could use normal conversational levels in the main saloon and nav station, right next to the engine room.

West Marine also has the foam/vinly, http://www.marinefoam.com/ also has multiple sound proofing products. http://www.acousticalsource.com/boat-soundproofing.html Another set of products

TomRay · Posted: Mon Sep 22, 2008 6:46 am Post subject:

acustis · Posted: Mon Sep 22, 2008 12:33 pm Post subject: Cummins vs Yanmar

I think everyone has answered the questions very accurately. We did install a only "one" of those Yanmar 100hp engines. And that is a local customer of ours here in Washington State. Other than that everything was the 125 and 110 hp Yanmar's. If you are looking for a used Ranger with the Cummins that is going to be tough to find. We started those Cummin's in the Early to Late 70's (Hull #'s)