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47 Cabo w/800 mans; GPH?

Discussion in 'Cabo Yacht' started by duke84, Jun 13, 2016.

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  1. duke84

    duke84 New Member

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    We are looking at a 47 cabo with 800 mans no tower. Does anyone know the gph and realistic cruising speed?


    thank you in advnce
  2. Capt J

    Capt J Senior Member

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    55-60GPH at cruise for both engines. 28-30 knot cruise. They're a good boat, well built and laid out, were a touch wet whereas the 48' fixed that and added more fuel capacity. They like to run with the bow fuel tank transferred to the cockpit tank as early as possible. Here's an old review on one with the 800 Man's.

    http://www.saltwatersportsman.com/boats/boat-reviews/cabo-47-flybridge
  3. duke84

    duke84 New Member

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    Thank you very much Capt j. I ran a 45 express for a few years. I agree with the quality of cabos. I figured that the fuel burn would be close to the same as the express, but was not 100% with all the added weight of the fb.
  4. Capt J

    Capt J Senior Member

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    A motor, such as a 800 MAN will generally burn the same GPH at the same RPM at cruise, no matter what boat it is in, provided they're both propped and achieve WOT rpm. I've run A LOT of boats for Cabo and pretty much the entire line up, the 45 is one of my favorites.
  5. MBY

    MBY Senior Member

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    We usually cruised around 26 to 27 knots in the 55 gph range with 800 MAN's, no tower, dinghy on the bow, set up for West coast fishing. You'll love the 47 and its huge cockpit. If fishing is your main priority the 47 is the perfect boat, definitely one of the fishiest hulls that we produced.
  6. BillManthorne

    BillManthorne Member

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    what are you running for RPMs to get to a true 28 knot cruise loaded with fuel, ice, etc? I have a 45 express with a tower and 800s. Loaded, I cruise around 24-26 at 1900. I believe the props I'm turning might be a little underpropped as I spin around 2400 rpm WOT.

    thx
  7. Capt J

    Capt J Senior Member

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    The 45 Cabo should cruise right at 28.5 knots at 1950rpms-2000rpms with the right props and 800 mans and 80% load, yours probably 2000 rpms, but won't hurt it to run them 2000 being underpropped. Man recommends cruising at 80% load. The 1000hp C18 boats cruised 30.5 knots and large Man's 1050's 32 knots. For best speed and ride, the 45 likes the cockpit tank full and to keep transfering it out of the bow and trim tabs 1/2 way down give or take. How much fuel and water and gear did you have on board when you hit 2400 rpms? I'd leave them that way and cruise them 2000 rpms, MANs aren't torque monsters like the cats and prefer to be underpropped and cruised at higher rpms. I run a 62' Sunseeker a lot with common rail 1100's and it hits 2360 rpms WOT and runs great that way.
    Last edited: Aug 4, 2016
  8. BillManthorne

    BillManthorne Member

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    I probably had 700g fuel and full water (100g) 2 guys. light on gear since it was early in the year. I believe my MAN guys told me to prop the boat at wot 2350. This are my old back up props. I need to get new ones next year. I never run mine at 1950 or higher. I've always babied them. I usually run at 1800-1900. Usually 1850ish. They sound like they are working much less hard at that rpm. Plus they have 3k hours on them now...just afraid of the consequences of pushing them... I'd love to repower with c18s, but I think it would be like cramming 10lbs of **** in a 5lbs bag. :) So I will probably end up with MAN 900 common rails. I love the boat and I don't feel like dumping $700k on a 2008 45 Viking with 1800 hours when I can completely repaint and repower entire engine room (i.e. mains, genset, ACs, ice machine, watermaker) for 250k ish and have a boat with 0 hours.
  9. Capt J

    Capt J Senior Member

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    1" more pitch will drop you 50 rpms. Cabo built a lot of 45's with C18's and they fit just fine, 30.5 knots is all you get at cruise, so is the extra 25 gph of fuel burn at cruise even worth installing 1000 hp engines over 800s
  10. BillManthorne

    BillManthorne Member

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    Wow. That much extra fuel?? The only bene of cats is service costs. If I repower it will be 900 MANs.

    Any experience with the 45 with 900s?

    Thx!
  11. Capt J

    Capt J Senior Member

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    No, I dealt with one of the last 45's with 1100 common rails. MAN's like to be run higher rpms, they have less torque and running them lower makes the load factors on them bounce all over the place, loading and unloading the bottom end more. They love to run at 76-80% load. Your engines if taken care of should go 6000 hours. If they built any 45's with the 900 common rails, it was just a few. Cats indeed are cheaper to service, however they're also a little thirstier than Man's and a lot louder (both engine noise and exhaust noise). However, the 1000hp C18s are darn near bulletproof. 30.5 knots at 85 gph with C18's. 32.5 knots at 85gph with 1100hp common rails. (80% load) My biggest complaint with the common rails are erroneous alarms and the alarm monitoring boards and sensors/senders go bad somewhat frequently and of course they're like $600 each just for a sender.
  12. CSkipR

    CSkipR Member

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    Bill for what its worth I have the Man CR900s in my 43 Cabo. My fuel burn at cruise is 58-60gph. I turn 2360 rpm at WOT.
  13. BillManthorne

    BillManthorne Member

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    How do you like the 900s? Also, am I reading MANs website correctly that the 900s are now v8 1000hp?
  14. CSkipR

    CSkipR Member

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    Bill,
    Overall I've been very happy with the CR900's. Only engine issue of any consequence was the engine oil cooler gaskets blew out around 400 hrs (naturally after warranty) about 6 months apart. Every owner of these engines has had the same gasket issue. The original gaskets were defective in one corner. Yes I have seen the new V8s are 1000hp.
  15. Capt J

    Capt J Senior Member

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    And of course, Man has an "updated part" to fix the oil cooler gaskets. Yet they will NEVER pay for their screw ups, it's always up to the consumer to pay for them.