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Thread: Help with engine options

  1. #16
    Join Date
    Jul 2015
    Location
    Orange County
    Posts
    1,301
    Boat
    2018 Rzx3
    The flash in the motor coupled with the some hard part changes makes that motor run pretty good... I really like it against the 2/1 as an alternative to the 575. In any of the 1.5-1 boats I just dont think its worth it.

    2/1 460 screams though for sure. Where its tuned coupled with that trans it runs like a bad ***.

  2. #17
    I run a 400 in my Z3 at Elevation constantly with added lead and have plenty of power. Top speed isn’t fantastic, but I bought it to surf not cruise. That said, with a slight prop change I can still surf and get 38 mph at Powell...


    Sent from my iPhone using Tapatalk

  3. #18
    Join Date
    Feb 2016
    Location
    Boise, ID
    Posts
    522
    One other thing to consider with the SC is that Indmar requires a 15-50 Full Synth(we are running 25-50) but regardless its a good jump up in price compared to the 5-30 that 400 and 440 run. Additionally if you are into doing your own maintenance the impeller is nowhere near as easy to get to on SC vs the 440. Plus up front cost and continued requirement for the high octane. We boat in McCall occasionally(just over 5,000ft) and we have lots of customers up there that are running 400's and 440s just fine, with the right prop for the job.

  4. #19
    Join Date
    Sep 2013
    Location
    St. Charles, MO and Osage Beach, MO
    Posts
    480
    Boat
    2015 Z3
    If you are running a lot of lake between sets, maybe the bigger motor is better for you. That said, once you get used to a 25 mph cruise and a WOT of 38...the 400 in my '15 Z3 is a great motor. Seriously, I've never had an issue with not enough torque no matter how many people/ballast I have in the boat.

    Yes, I've been passed by my buddies running down the lake, but I'm ballasted the minute I can and run much of the time at surf speed. The way I use my boat I'd not opt for the biggest motor.

  5. #20
    Join Date
    Dec 2005
    Location
    Colorado Springs
    Posts
    742
    Boat
    2016 Z3
    For reference...at 4800 feet, no ballast, 440, 2016 Z3, 1:1.5 trans

    2419 speeds
    30 mph = 4200

    Speeds with OJ 948 (15"x14pitch)
    28 mph = 3650
    30 mph = 3872
    31 mph = 3960
    32 mph = 4100
    WOT = 39 mph = 5513

    Overall the 440 is fine on the Z3. The 14 pitch is the sweet spot for how we use our boat. Im sure the SC would be even better but it sounds a little bit like a pain in the butt.

  6. #21
    Join Date
    Jul 2015
    Location
    Orange County
    Posts
    1,301
    Boat
    2018 Rzx3
    Ill play too..

    Rzx 3 w/575 and 1.5/1 4000ft.

    Acme 16 x 16 (Heavy weighted prop option)

    30 Mph = 3510Rpm
    35 Mph = 3800Rpm
    37 Mph = 3920Rpm
    39 Mph = 4200Rpm
    41 Mph = 4540Rpm

    Wot = 44MPH at 5020Rpm

    Loaded
    (4760lbs of total ballast)4 people with full fuel
    *Taps 3 On

    11.0 Mph = 3000Rpm
    11.6 Mph = 3150Rpm
    11.8 Mph = 3300Rpm
    12.0 Mph = 3450Rpm
    12.5 Mph = 3550 Rpm

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