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Thread: 115 Evinrude

  1. #1

    115 Evinrude

    hi all
    i have a 1990 Evinrude 115 hp i only get 1 km to the liter is this normal for these old motors
    cheers snap

  2. #2

    Re: 115 Evinrude

    Sounds about right, what is your max RPM with a normal load, flat out?

  3. #3

    Re: 115 Evinrude

    4500 rpm to 4800 on a good day

  4. #4

    Re: 115 Evinrude

    boat size matters too
    i had a 90 same block and got about the same when running around

  5. #5

    Re: 115 Evinrude

    It's about right according to the old rule of thumb but 4800 RPM at WOT is a little low.

    1 US GALLON per 10 HP per HOUR at fast cruise.

  6. #6

    Re: 115 Evinrude

    4800 is way low, can you borrow another smaller prop to try? Has the motor always been like that? Have you checked motor height? Is the boat or motor new to you?

  7. #7

    Re: 115 Evinrude

    Quote Originally Posted by Noelm View Post
    4800 is way low
    Agreed. I'd be looking for WOT about 6000 rpm.

  8. #8
    Ausfish Addict Chimo's Avatar
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    Jun 2006
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    Gold Coast

    Re: 115 Evinrude

    5000- to 5500 rpm is more real for a Oldtech 115 HP
    What could go wrong.......................

  9. #9

    Re: 115 Evinrude

    I asked on the Bass Boat Central Evinrude forum and the advice is that the operating RPM is 4500 - 5500

  10. #10

    Re: 115 Evinrude

    Any of those old carby 2 strokes want to be revving up near their max RPM, it will increase motor life, increase performance and better fuel economy, can't see any reason to have it lower in RPM band.

  11. #11

    Re: 115 Evinrude

    Thereís a difference between being propped to reach a wot of 5500 and driving it at 4500 rpm
    versus only being able to reach 4500 rpm

    If a engine canít make its peak rpm itís being laboured through the whole rev range
    You didnít say what boat itís on is it big enough for the boat to begin with ?

    my 90hp 1.7l v4 1998 had a 5500 peak rpm spec

  12. #12

    Re: 115 Evinrude

    Please yourself, I asked what his max RPM as with a light load, his response was 4500-4800, so we assume that's his max RPM? but, never mind, I'm out.

  13. #13

    Re: 115 Evinrude

    My 1996 workshop manual, which i believe is the same block, states the 88,90,100,110,115 engines have an operating range of 4500 to 5500rpm. So, while 4800 is within spec, i'd want mine to rev to the mid 5's!

  14. #14

    Re: 115 Evinrude

    Quote Originally Posted by Noelm View Post
    Please yourself, I asked what his max RPM as with a light load, his response was 4500-4800, so we assume that's his max RPM? but, never mind, I'm out.
    I offend you ?
    I agreed with you so no idea why your saying your out

    a boat that canít meet peak rpm will be propped poorly across the whole rev range

  15. #15
    Ausfish Addict Chimo's Avatar
    Join Date
    Jun 2006
    Location
    Gold Coast

    Re: 115 Evinrude

    Great motors is all I can add and my two are still going strong with lots of smoke at start up and thats what you want so they will never wear out so the marine tech keeps telling me.
    What could go wrong.......................

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