Anyone seen it yet?
Anyone seen it yet?
Had one at the Fairbanks outdoors show, looked to be about a 22 footer, not cheap, 60k.
Here's some flowscan numbers at the demo conducted on the Chena.
RPM MPH GPH
3000 25 5
3100 28.8 6
3400 32.4 7.3
3600 36.4 8.8
3700 38 9
3900 39 12.2
4100 41 15
Weight tested in Valdez over the weekend. Boat full of 90 gallons of fuel weighs 4000lb.
With 9, 32gallon trash cans full of water and two passengers the boat carried the extra 2700lbs of payload on step at 27mph at 3700rpms at 9.0 gallons per hour on the flowscan.
With full tank and 4 passengers, lined up against a 8.1L Thunderjet, beat the Thunder by 5 boat lengths out of the hole until he caught up. Thunder had overall faster speed. The boulton cruised at the same speed with an extra 200 rpms. He can have the top end, I'll take the economy.
After 4.6 hours from fuel top off, the flow scan indicated 18.8 cumulative gallons. The boat took 19 to top off again so the flow scan is nearly dead on for a total of 4.13 gph after weight testing and hot dogging the boat during the demos.
If your tired of dumping fuel out the tail pipe now is the time to switch to diesel. FNM Alaska is factory direct dealer for the Boutlon with the FNM diesel engines.
They'll be doing demo rides at the Wasilla Lake in the near future.
You can reach them at 907-440-9148.
The majority of PrecisionWeld boats are desiels these days. They have even built a couple of twin diesels. HCM has built one as well. I have ridden and drove several. They work pretty good. Not as peppy as a gasser but they get the job done with a lot less fuel.
Are these puppies being turbo charged??? Turbos work best with very cold air intake, and I would think that being on water would assist in this Also, I think some of the engineers would love to do "custom burns" on four position Chip and/or programmer Sounds like fun.
BTW, turbo charging, chipping, and finding the "right" exhaust system will all benefit the diesel engine, make it perform better/faster, and *improve* the MPGs!!! All win/win IMHO.
"...and then Jack chopped down the beanstock, adding murder and ecological vandalism to the theft, enticement and vandalism charges already mentioned, but he got away with it and lived happily ever after without so much as a guilty twinge about what he had done. Which proves that you can be excused just about anything if you're a hero, because no one asks the inconvenient questions." Terry Pratchett's The Hogfather
Tell me why I should not buy one of these. I can't trust anybody who is bragging about how good their efficiency is, because they all measure using one second in time and it is usually going down river and/or at best rpm. Looks like a wide open diesel is twice better than the most efficient 350's at optimum rpm's and conditions. Why not. who do I make the check out to?
Rpm/GPH/Speed/Engine Load % (From Diagnostic Software)
After 4.5 hours of running in rough seas in Homer, a bunch of horse play and the above testing, the flowscan indicates 23.3 gallons used for a cumulative consumption of 5.1gph.
It's all about crank horsepower at the shaft at a given rpm. The 330hp 350 is stalled out by the pump at 4100-4200 producing only 220-250hp. Doesn't matter what size hp engine you throw in front of the pump. If it can't produce more power then the pump absorbs at a given rpm you'll only see the pump hp performance. The FNM 250's power at WOT matches perfect with the 2.4 Turbo impeller absorption and has plenty to spare at typical cruise rpms between 3000-3700. The engine when close coupled to the hamilton is 7" shorter and 100lbs lighter as well, which just adds to better economy in the long run with less weight.
Check out http://www.fnmalaska.net/HPE225_250Series.html for some pictures of the engine installed in the Boulton.
I own two diesel jetboats and i will never own a gas boat again.I have a new 2010 20' Precisionweld with a 6BY yanmar/BMW 260 hp turbo and a 213 Hamilton pump/2.7 impeller for the small rivers.I also have a 2007 25' Precisionweld with a 6LP yanmar and a Hamilton 241.Both have stick steer and i run offroad fuel.You only live one time and now is the time to drive a diesel.I have had jetboats for 26 years.
I would spend my money on a diesel anything now days with the way there changeing the fuel next year. Don't get me wrong I like that boat alot. But with all the changes come to diesel fuel it will hard enough to sell my over priced diesel truck.
Theres more jetboats per-capita in Cordova than anywhere in the world. I've fished there and had 6 different jetboats in the last 30 years. You couldn't give me a diesel. I watch the diesel guys on the beach waiting weeks for parts. Most jet boats are direct drive (no tranny) so when you're starting them cold they have a load on them, thats awful hard on a 30k diesel. Plus the fact that there is no neutral so you're using the starter 50 times more, again murder on a diesel. The performance isn't there, the fuel is higher price and they last the same amount of time as a gas engine. Its a no-brainer 12k for a 496 vortec w/ a mechanical throttle and 390 hp, or 30k for a Yanmar 315 w/ a electronic throttle and only 315 hp that weighs 120lbs more, hmm I know what motor I want the gas motor. Say the gas motor burns 15gal and hour compared to the 9 gal an hour on the diesel. Theres no way you could burn the difference in price in fuel before you are replacing your motor and starting over. The only advantage I see w/ diesel is its safer cause its less volatile.
As for the BMW diesel.....they're stacked like cordwood behind Cordova Outboard, people that had them went back to gas or switched to cummins, believe me when I say the BMW is junk
I can't argue any points of gas Vs diesel because I know zip about jets but give Tom a call or send him an email I do know he will have answers for your questions.
fullbush, wow perhaps reading the WHOLE thread would clue you in better. Mel is talking about a smaller diesel that is lighter and burns less fuel. He already stated that offroad fuel is cheaper than gas and has the same power as a 350. Personally I would never own a big block in a jet boat. The 496 you speak of is a hog compared to the 350 and the diesel being discussed.
The Yanmar weighs less than a 496. It is quite a bit longer though. Also, it is only rated at 315 HP but it will turn a 4.0 impellar the same RPMs as the 496, so the top end performance is pretty close. The only performance advantage (with a HJ212) the gas motor has is that it doesnt have any turbo lag. Most people say that they are able to get used to the turbo lag, I personally like the snap of a gasser.
What's the weight of a 496?
As far as lag goes, the Boulton with FNM jumps out of the water as fast or even fast then the gasser. I personally don't feel any lag. We lined up with an 8.1 Thunderjet and had 5 boat lengths ahead of him before he finally caught up. We lined up with a 20' thunder jet also with a light load and with the 350 and 2.4 impeller. I had 5 passengers and full of fuel. We were equal out of the hole and he was faster at top end since he was much lighter.