CAT 3116 Boost/egt numbers?

Discussion in 'Downeast Engine Room' started by Toolate, Apr 24, 2016.

  1. Toolate

    Toolate Captain

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    Just got off the phone with HOPenn and they were going to check but didnt seem to think they had a spec on boost. They are going to send me the dyno sheets for the engines from when they were built/factory tested.

    No load wot rpm is right around 3000 (+/- 20 or so he said- marked on valve cover but I cant see it under the deck). Still have to photo tach.

    Amazing variations in EGTs between engines. Mine are 750 or so and people talking 1100 and change. Would be an interesting thread on its own. Boost/EGT comparisons.
     
    Last edited: Apr 29, 2016
  2. Scotth

    Scotth Senior Member

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    Need to make sure to distinguish pre and post turbo pyro measurements, big difference.
     
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  3. El Mar

    El Mar Captain

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    I know this is a CAT thread but here's a pic of the 420 Yanmar, 33 Flowers at cruise.
     

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    Last edited: Apr 29, 2016
  4. gmac

    gmac Senior Member

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    Kinda hard to see in pic but its showing under 600 deg, about 550 deg..

    should add:

    QSB 480, 2750 rpm @ 11.7 gal/hr, 20.5 knts.
     

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    Last edited: Apr 29, 2016
    gmac,
  5. Ol Gilnetter

    Ol Gilnetter Senior Member

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    Gary you're not even stressing the paint with numbers like that.....!
     
  6. BillD

    BillD Captain

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    Over here on the Cummins 5.9 6BTA side :)D) we like to see high 800s, low 900s max....EGTs up near or over 1,000F simply means a badly over propped engine that if you photo tached it would be hard pressed to reach 3,000 rpm WOT rated.

    As I posted earlier in the 31 Blackfin I had the 370s propped to 3150 keeping the engines under propped.

    In the 25 Terry Jason I have the 370 propped to 3200-3250 really under propping the engine. I did this to "de-tune" the 370 so I could bolt on a ZF63A gear. The ZF63A is diesel rated @315 hp @ 3300 rpm max.
     
  7. BillD

    BillD Captain

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    The golden rule: Propellers move boats...engines only turn them.

    Too big a prop (diameter and pitch) so the engine cannot even make rated rpms @ WOT...in this case a 3116 @ 300 hp should make 2800 WOT....anything less than 2800 measured by a photo tach and the engine is overloaded. This setup drives up EGTs.

    Take out some diameter and or pitch until the engine can make a true 2800 and you are getting all the hp out of the engine and the EGTs stay down.
     
  8. Toolate

    Toolate Captain

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    GMAC that aluminum dash you made is ridiculously nice lol.
     
  9. crabz

    crabz Senior Member

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    Any idea on what the differences is? If post turbo is there a rule of thumb on how much temperature to add ?
     
    Last edited: Apr 30, 2016
  10. Toolate

    Toolate Captain

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    Ha don't think anyone wants to talk bat this any more but ran the boat a while yesterday and the EGTs were even lower. More like

    765 @ 2200
    710 @ 2400
    680 @ 2800 wot? Lower than at cruise?

    I have 2 engines and gauges are ne and readings almost the same. Boost 23-25psi at wot.
     
  11. digs

    digs Member

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    Are you getting to 180 deg in the motor ?
     
    digs,
  12. crabz

    crabz Senior Member

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    Are you more "on plane" at higher RPM's , more boat out of the water, less drag ?
     
  13. Toolate

    Toolate Captain

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    Yes I think running about 185 (low 180s can't remember exactly) but climbing to 190 after a couple mins at wot.

    Thermostats are new and engines run exactly the same surprisingly or at least that's what the gauges show. Boost is a little lower on the P engine but only maybe 6-8%
     
  14. Toolate

    Toolate Captain

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    I need to play with the boat and figure it out. It's definitely planing at 2100 but tabs help bring the bow down and are not needed at wot so yes it's more up on top of the water but that makes sense because wot is 29 mph and 2100 is like 18 or so.

    Need to take an hour ride on a calm day and record a bunch of data points and play with the tabs and see how it responds.
     
  15. digs

    digs Member

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    Thinking about the actual load its divided by 2 , so in a single engine vessel you may see higher load and temps . Sounds like its happy to me .
     
    digs,
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  16. Ol Gilnetter

    Ol Gilnetter Senior Member

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    This thread got me thinking so I put a pyro on my exhaust last week, then was asking Tony Athens about various pyro temps and I recalled the 1100F temp El Mar posted and it was thought maybe a bit high, but Tony says Yanmar has the port pre turbo and to expect up to 400F higher temps for that application. Crack a cold one El Mar sounds like that Yanmar is purring perfect.
     
  17. eyecatcher

    eyecatcher Member

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    I owned a few 3116's and 3126's and you want to keep them under 850-900 post turbo per Caterpillar or you will cut their life expectancy. they can pull full rack at 1850-2000RPM that is usually a hot spot rather than WOT on most DE and planing hulls. Good way to get them there is prop them under prop them 3-5% so you should be hitting 2800-2950, based on your readings your numbers are right on the money. I would just keep as is.. clean oil and fuel
     
    Last edited: May 11, 2016
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  18. Bob_Johndrow

    Bob_Johndrow Member

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    The Governed non load RPM is on the nameplate on the 3116 300's that I am under contract on is 3015 rpm.
    At the sea trial, moderately loaded, boost was 25.0 psi at 2785 rpm and 25.5 psi at 2778 rpm.
    Speed was a mediocre 21 knots. Props have not seen reconditioning in many years. Boat is a 17500 lb planing hull and the Cats have 2029 hours on them. Bottom was just cleaned and paint job was mediocre.


















































































































































































































































    and 25.5 psi
     
  19. Bob_Johndrow

    Bob_Johndrow Member

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  20. Zipperhead

    Zipperhead New Member

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    Hey Toolate, I am in the process of buying a 1997 36' Sabre with 3116ta's with 1300 hours that appears not to have had its 1000 hour service any advice on what should be addressed first?
     

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