CAT C7 experience and opinions wanted

Discussion in 'Downeast Engine Room' started by xbskt, Oct 27, 2017.

  1. xbskt

    xbskt Captain

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    I looked around on Boat diesel with not much found. Maybe that's a good thing. I dunno.
    Can I get some input on your experience and opinion of the Cat C7 450HP?
    thanks
     
  2. aegus15

    aegus15 Senior Member

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    Almost bought one , 48,850 with new 507 twin disc from Milton Cat, ( still might )they have one on the floor right now.
    Too much to change , mounts ,exhaust, cut and re align the 2” shaft , and str.6 cylinder is tall....very impressive numbers though and heard only good things about them, they can de rate the hp down to 406 which was a good option for my needs.
     
  3. powderpro

    powderpro Captain

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    Thankfully you didn't buy one for $48,850, that's in the ballpark of what a new QSB 425hp with gear would cost, and the 6.8 Deere is even a few thousand dollars cheaper than the QSB. I would much rather have the Cummins or Deere over the C7 Cat. There's a reason they don't build a C7 anymore... Cat just came out with a new 7Liter called the C7-1, looks like a nice engine.
     
    Last edited: Oct 27, 2017
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  4. aegus15

    aegus15 Senior Member

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    This is the price for the C 7.1 should have said that. Sorry, yes it’s a very good one.....I think it is 460 hp if I remember right
     
  5. Rockasauras

    Rockasauras Captain

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    FWIW

    a long time friend and fishing buddy of mine owns and operates a trash hauling company and strayed down the path to have a few trucks powered with the C7 CATs. There isn't a fishing trip that goes by without several minutes if not an hour that is devoted to cussing, spitting and hating himself for ever choosing that engine option. He states without hesitation the worst decision he ever made. Period. Heui pumps, injector failures etc etc etc. Do yourself a favor and look at other forums where truck owners vent their frustrations too.
     
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  6. xbskt

    xbskt Captain

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    SOOO.. That two in the negative column.
    Thank you.
     
  7. Gurryman

    Gurryman Captain

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    When I was in the trucking racket, I ONLY ran Cats, great service and parts availability, also Pricy but who cares Downtime was not an option. For my leisure I choose Cummins, Dependable, easy to work on, and reasonable parts pricing with excellent availability.
     
  8. WoundUpMarine

    WoundUpMarine Captain

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    If it was me, personally, I would stay far away from any engine with HEUI fuel injection system. Too much going on there.
     
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  9. scupper1

    scupper1 Senior Member

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    Not to beat a dead horse, but I don't think you are going to do much better than going with a Cummins factory recon engine. A member here just put in a 6bta 330 with a 5 year/12000 hour warranty that includes parts and travel for what I consider a very fair price. Just my 2 cents.
     
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  10. BillD

    BillD Captain

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  11. tunaorlater

    tunaorlater Captain

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    Pricey I'm sure but the new Volvo D8 would be my first choice in your hull right now. That's obviously if money wasn't a concern.
     
  12. xbskt

    xbskt Captain

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    If only money wasn't a concern...
    I do want to retire someday and also stay married. Haha.
    It would also be helpful if the Crowley had sold but no such luck yet.
    The NB was unexpected but obviously I couldn't pass it up.
    All I know for sure at this point is it won't be a C7.
     
  13. Machias

    Machias Senior Member

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    I would check out the Cat 7.1 which is a perkins. we have one we just replaced a C9 with on our MC. 600lbs lighter than the C9 no valve adjustments or zincs and has some nice options and is very accessible. I should have seatrial #s this next week.
     
  14. xbskt

    xbskt Captain

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    I got a quote on the 7.1 very early in the process when I thought maybe just repower in with another CAT would be the way to go.
    38k and change bobtail with one panel and harness.
    I wasn't in love with the CAT concept or a "new" offering from CAT as yet unproven to pull the trigger.
    I look forward to seeing you seatrial numbers though as other than the old C7, nothing has been ruled out completely.
    Maybe a 5.7 MPI for something completely different.;^}>
     
  15. scupper1

    scupper1 Senior Member

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    There is a c7 455hp w/ I think 4500 hrs for sale on Maine commercial fishing gear swap/sell on Facebook for about 10 grand if you are still considering this.
     
  16. Jbuck

    Jbuck Member

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    I know of one boat with the engine. He HATES it. It's been out of the boat 2 with less then a few hundred hours. Could have been a lemon, but I see it's part Of the trend on here so maybe not.
     
  17. Machias

    Machias Senior Member

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    So I knew #s we’re gonna be way off we’re gonna get a new prop lookin at options now... Wildcat says we need a 26X20

    ice box onboard no ice 4 crew

    Against tide
    21.3 knots 2330
    17.4 knots 2000
    14.8 knots 1800

    With tide
    23 knots 2320
    19 knots 2000
    16 knots 1800

    2900 RPM engine Cat 7.1
    Propeller: Hy-Torque 26d x 25p 4-Blade
     
  18. eyecatcher

    eyecatcher Senior Member

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    what boat and gear do you have it in cap?
     
  19. Machias

    Machias Senior Member

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    37 Mitchell Cove
    Twin Disc 2:1
     
  20. eyecatcher

    eyecatcher Senior Member

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    She pushes nice. Probably get a 16-17knot cruise out of her and same 21-23 at WOT. I'd say wild cat would be right on the money
     

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