Mid 1990s Viking 60 CPMY your thoughts....

[saltshaker]

and since money is no object, take that 70 ft. My, push the throttles all the way forward, get that big mf up on plane and go home! That's what these boats were made for, not to be gd trawlers.

x2!!!

[capttonyf]

And since money is no object, take that 70 ft. MY, push the throttles all the way forward, get that big MF up on plane and go home! That's what these boats were made for, not to be GD trawlers.

That would be nice but unfortunately some of these older 70/74 Motoryachts with DD 12V71's won't get on plane, and if they do it's only at WOT. So now your forced to run them like a damn trawler. Lol. I'd even go a step further and say I've seen more that won't get on plane or stay on plane then I have seen that will. They get to weighted down, and, or people have messed with wheels etc over the years to make them more efficient at slower speeds to where, now, they can't get out of there own way.

Tony

[doc g]

That's How I run our 74SD (Cat Power), slow and easy at 1000 rpm,10.4 K burning 13 gph...if it's nice out and we have the time. When it's snotty it's 1850rpm and 19.5 K, 64gph. or faster. The snottier it is the faster we run and the better the ride....Pat

[saltshaker]

That's How I run our 74SD (Cat Power), slow and easy at 1000 rpm,10.4 K burning 13 gph...if it's nice out and we have the time. When it's snotty it's 1850rpm and 19.5 K, 64gph. or faster. The snottier it is the faster we run and the better the ride....Pat

Are those 1350HP 3412s? A friend has the 1400HP in a 62 Ocean and he's says he's burning 98GPH at 1800 which I think is way too high.

[doc g]

Yea and that was measured with Cat's own laptops.When I surveyed pre purchase ....and that does sound high . I've heard of 74s burning 80 something at 1800 -1850 .....Pat

[doc g]

I think max for those is 150 GPH at 2350 rpm . I think mine reads 74-78 at 1850 on the onboard (Cat) displays but the techs said they do that on purpose . Mine runs out at 1850 , 50% load , 64 GPH . It's the sweet spot for this set up ......Pat

[Pascal]

my guess is that the ocean 62 will be going much faster at 98gph/1800, probably 25/27ktd?

Burn will depends on the boat, gearing, wheels, etc... The 2003 Johnson 70 MY I used to run has 1400hp 3412Es and woudl burn about 85gph at 1800 doing 20/21kts. For comparison the 2009 Lazzara 84 I m running now has 1650hp C32s (a development of the 3412) and burns 92gph at 1800 doing 22/23kts. Much bigger boat (actually 18' loa difference) yet burns less fuel at the same speed. For instance at 20kts we burn 68gph with the 84 vs 80 on the 70

At first I thought the cat ECUs were off but the tech assured me they can't be and the flow numbers were validated by actual refill.

[motoryacht lover]

I am not a MAN fan I would prefer big Cats in my next boat but I would not rule out a MAN powered boat for next boat. I came from Detroits and was scared to death of the MANs but a friend who had them talked me into it. I do my 1000 hr service every 2-3 years and it averages about 15,000 and I get all new (rebuilt) injectors and the 15 usually covers some things beyond the 1000 hr service. I Wonder if one ran the numbers but when you factor rebuilding Detroits every 2000 hrs do numbers get closer together when you consider that the 820 MANs typically are good for 4000 hrs or more. I do hear everyone on the costs of parts. I paid 8000 for an intercooler. But with the Detroits I had temperature creep that drove me crazy. I had to clean the heat X I think every year or I think I would pull them every other year and run solution through them on the in between years. In summary I think the cost of the MANs sometimes gets overblown some.

[Pascal]

I ve put almost 4000 hours on these 3412Es in 8 years and service costs have been around $5000 to $6000 every 1000 hrs combined. 5300 hours, no smoke, no soot and original injectors. I mean... They just keep on going and going and going with just oil changes and new impellers every three years. The only non scheduled part I had to replace in 8 years was one fuel cooler that developed a pin hole on the raw water side. $1000 part. Not bad.

That said, even Cat gets it wrong sometimes as with the aftercoolers on the earlier C32s. They ve had a number of failures due to a design issue and it's a $15k per engine upgrade. Now again, these are 1650hp V12s so... the aftercoolers are pretty big. Do you try to save $15k and risk a $160k engine? Nope... So in our case the owner bit the bullet and upgraded them after buying the boat...

[SeaEric]

That's How I run our 74SD (Cat Power), slow and easy at 1000 rpm,10.4 K burning 13 gph...if it's nice out and we have the time. When it's snotty it's 1850rpm and 19.5 K, 64gph. or faster. The snottier it is the faster we run and the better the ride....Pat

26 knots on a snotty sea trial day in the Gulf on doc's boat.