Results 1 to 17 of 17

Thread: Impressive Diesel Jet stats

  1. #1
    New member
    Join Date
    May 2010
    Posts
    11

    Default Impressive Diesel Jet stats

    Just thought some of you might like to see these numbers. Just took a ride past the Yentna Station Roadhouse with my new 22' Boulton Jet with 250hp diesel. I am no expert, but I thought this might spark a discussion. Let me know what you think.

    Over 78 river miles
    2.83 hrs
    18.1 gallons used
    27.6 mph avg speed
    36.2 mph max speed

    My public school math says 6.4 gal/hr...4.3 mi/gal...90gal tank gives me 390 mile range! We were not exactly easy on the throttle. Boat had three people plus goods for the Roadhouse and a friend's cabin.

  2. #2
    Member Jimw's Avatar
    Join Date
    Jul 2006
    Location
    Alaska
    Posts
    452

    Default

    Not bad numbers. Do you have a guess at total of the weight of the "goods" on board? Down stream loaded, up stream empty?
    2005 20' Weldcraft Sabre XL 350 MP
    SD309 AT
    2009 Polaris Dragon 800 163
    Custom Mod's

  3. #3
    New member
    Join Date
    Aug 2008
    Location
    Estacada,or
    Posts
    9

    Default new diesel

    Do you have the yanmar 6by in it? I have a new 20' Precisionweld with a 6by and i just did 160 miles on the Main Salmon in Idaho and my burn rate was 5.9 to 6.8 GPH.I have lots of power.I ran with a 24' with a 8.1 gas and his burn rate was 11 to 13.6 GPH.Gasoline is for trolling motors.

    Eagle1

  4. #4
    Member Dupont Spinner's Avatar
    Join Date
    Jun 2007
    Location
    Chugiak
    Posts
    1,425

    Default

    Quote Originally Posted by Jimw View Post
    Not bad numbers. Do you have a guess at total of the weight of the "goods" on board? Down stream loaded, up stream empty?
    The thing about running the Yetena river is it's downstream and upstream in the same trip...............both ways.

  5. #5
    Member Jimw's Avatar
    Join Date
    Jul 2006
    Location
    Alaska
    Posts
    452

    Thumbs up

    Got it, mixed bag.
    2005 20' Weldcraft Sabre XL 350 MP
    SD309 AT
    2009 Polaris Dragon 800 163
    Custom Mod's

  6. #6

    Default

    Those sound like good figures to me. What size/type jet?

  7. #7
    New member
    Join Date
    May 2010
    Posts
    11

    Default FNM with Hamilton

    22' Boulton with Hamilton 212 2.4 Turbo impeller. The engine is the FNM 250HP Diesel. Weighs 100lbs less than a 350 and 7" shorter.

  8. #8
    Member
    Join Date
    Oct 2006
    Location
    Fairbanks
    Posts
    973

    Default

    Quote Originally Posted by no pavement View Post
    22' Boulton with Hamilton 212 2.4 Turbo impeller. The engine is the FNM 250HP Diesel. Weighs 100lbs less than a 350 and 7" shorter.
    I am in the market for repowering my rig and those are impressive fuel numbers but leaves me with questions:

    Curious for a little more specifics on the weights that you are comparing - what is the weight of each and where are you getting them from? My searches keep coming up with different information.

    What do you estimate the total weight of the gear and people you were carrying when checking the fuel consumption?

  9. #9
    New member
    Join Date
    May 2010
    Posts
    11

    Default

    http://www.fnmalaska.net/HPE225_250Series.html

    The gm/marine website advertises 435 lbs for their 5.7, but they also say it only has 290 hp. Not sure if it is a different motor the Alaskans are saying has 330-350 hp. I also saw on another website showing the weight of the 4.3 as 600 lbs. Good luck with finding the truth!

    I estimate about 680-700 lbs of riders plus another 250-300 lbs of gear. I would guess 200 or more lbs of gear was offloaded at the roadhouse so more than half the trip was with less gear. Mel at FNM did more extensive load testing in Valdez with somewhat accurate weight measurements using water in trash barrels.

    Good luck with your research. I hear from the grape vine that the diesel jet wave is coming to Alaska and the prices WILL go up.

    http://anchorage.craigslist.org/boa/1756384149.html

  10. #10
    Member Ellamar's Avatar
    Join Date
    Apr 2006
    Location
    Fairbanks
    Posts
    381

    Default

    Kodiak's website shows 310hp for the carb version, 330 for the EFI.

    www.kemequipment.com

  11. #11
    New member
    Join Date
    Aug 2008
    Location
    Estacada,or
    Posts
    9

    Default Diesel jets

    Diesel jetboats are the only way to go.


    Eagle1

  12. #12
    Member akriverunner's Avatar
    Join Date
    Apr 2007
    Location
    wasilla
    Posts
    506

    Default

    if they had a bigger diesel then 250hp i may be interested but i will stick to gas for now.

  13. #13
    New member
    Join Date
    May 2010
    Posts
    11

    Default

    Is it the top end speed you need or the overall horsepower? I think the torque or holeshot is sufficient with this size of diesel.

  14. #14
    Member broncoformudv's Avatar
    Join Date
    Apr 2006
    Location
    Anchorage, Alaska
    Posts
    4,670

    Default

    The torque is what powers our jetboats along, I have never understood why the engines are rated by horse power instead of torque. Guess those big or small numbers sound better.

  15. #15
    New member
    Join Date
    Dec 2006
    Posts
    12

    Default

    A couple of years ago, I swapped out the Ford 460/3 stage Kodiak in a 25' Wooldridge Classic for a Yanmar 6lp/stp2 and Hamilton 241 with the aftermarket turbo impeller and added a ZF 63 transmission for a true neutral. I also replaced the canvas top with an aluminum hardtop.

    The diesel transformed the boat.

    The boat cruises with a full load (120 gallons of fuel, 4-5 big guys, coolers, gear, etc) 30-32 mph on the gps depending on wind, and 9-10 gallons per hour. (primarily salt water running) Top speed dropped from 47 mph to 42 mph Previous cruise numbers were 24-26 mph and 15/18 gph. I had 18 years and just under 3000 hours on the Ford before I swapped it out, and it was still running fine.

    The diesel swap was expensive. . . . just under half what a new boat would have cost. I suspect that the increased performance is equally attributable to both the diesel and the increased efficiency of the 241 pump over the old 3 stage.

    If you are going to do any amount of running in salt water I would highly recommend the transmission. It adds less than 100 lbs,(with the new jets that is nothing) and it lets you back flush the jet and run the engine when you are pulling pots, etc.

  16. #16
    Member fullbush's Avatar
    Join Date
    Feb 2010
    Location
    Wasilla
    Posts
    2,674

    Default

    Quote Originally Posted by Tip View Post
    A couple of years ago, I swapped out the Ford 460/3 stage Kodiak in a 25' Wooldridge Classic for a Yanmar 6lp/stp2 and Hamilton 241 with the aftermarket turbo impeller and added a ZF 63 transmission for a true neutral. I also replaced the canvas top with an aluminum hardtop.

    The diesel transformed the boat.

    The boat cruises with a full load (120 gallons of fuel, 4-5 big guys, coolers, gear, etc) 30-32 mph on the gps depending on wind, and 9-10 gallons per hour. (primarily salt water running) Top speed dropped from 47 mph to 42 mph Previous cruise numbers were 24-26 mph and 15/18 gph. I had 18 years and just under 3000 hours on the Ford before I swapped it out, and it was still running fine.

    The diesel swap was expensive. . . . just under half what a new boat would have cost. I suspect that the increased performance is equally attributable to both the diesel and the increased efficiency of the 241 pump over the old 3 stage.

    If you are going to do any amount of running in salt water I would highly recommend the transmission. It adds less than 100 lbs,(with the new jets that is nothing) and it lets you back flush the jet and run the engine when you are pulling pots, etc.
    The jet transformed the boat not the diesel. the old 3-stage doesn't begin to compare to a 241. Throw a 496 (8.1) vortec in front of the 241 and you'll wonder why you spent so much on Yanmar diesel when you could buy the 496 for 1/2 the money. The Yanmar has no more lifespan in front of a jet than a gas motor, thats a fact. On both applications the risers, manifolds, heat exchangers etc wear out long before the engine does. The 12k difference in price buys a lot of fuel. So in my opinion, its smarter to go w/ the performance of gas for the money. The only drawback to gas is that it explodes which is why some people might decide they would rather choke on diesel exhaust than burn up in a boat fire.

  17. #17
    New member
    Join Date
    Dec 2006
    Posts
    12

    Default

    I had friends say the same thing too. . .until they rode in the boat. You can make the same case for a big gas V8 in a one ton pick-up. It will do the job, but it just isn't the same as the diesel.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •