No members are browsing this topic
|
|
shueman
Libra
HDF Gold Supporter
Born To Drive...
   
Alta Loma CA
Posts: 17,228
APPD 2.27
Post Rank: 4
NADA
|
 |
Posted: Mar. 29 2008,6:05 am |
Post # 1 |
   |
Fuel consumption in the new jets are pretty much on par with outboards or prop inboards. It's all in how they're driven. I'll put our fuel mileage up against any "hot boater" on the boards. The port fuel injection in the 496 makes them way more efficient than the 350 carburetor engines we ran in our last set of aluminum jets.
I haven't run positive numbers yet, but I think they'll be within 1 or 2 GPH of the our outboards. The 250 Verados burn around 28 GPH at WOT, and around 8-9 GPH at cruising speed (3,800 RPM) As of today, we've put 4 hours on the boat and have burned about 25 gallons of fuel, That's just over 6 gallons per hour, running at a fairly consistent 3,100 RPMs, with minimal idling and occasional 5-10 second WOT bursts to aid in break in.
The myth of a jet boat being so much more of a gas guzzler than a prop, is just that. A myth. A jet is just an enclosed prop. Rather than pushing water against water for propulsion, as with a conventional prop, it's pushing water against air. As long as the jet/engine size is compatible with the type of hull, and the pump itself is kept within tolerances, they are very similar in fuel use to a prop. In both there will be about a 10% loss of power at the prop (or impeller) due to slippage.
The operator is the biggest fuel waster in any kind of boat. Easy/smooth on the throttle will do wonders to keep your fuel use down. Something that's really important with today's prices.
Posted by BoatCop on PB....
|
| Back to top |
|
| Member # 376 | Joined: 2-01-2004 | |
|
|
GoFastRacer
HDF Supporter
V-Driver For Life!
 
Big River, Ca
Posts: 62,729
APPD 7.90
Post Rank: 1
Spectra20
|
|
Posted: Mar. 29 2008,6:10 am |
Post # 2 |
|
Right!..   
|
| Back to top |
 |
| Member # 101 | Joined: 3-03-2003 | |
|
|
shueman
Libra
HDF Gold Supporter
Born To Drive...
Alta Loma CA
Posts: 17,228
APPD 2.27
Post Rank: 4
NADA
|
|
Posted: Mar. 29 2008,10:51 am |
Post # 10 |
|
A lot of the decision rests with your home waters and primary usage... 
|
| Back to top |
|
| Member # 376 | Joined: 2-01-2004 | |
|
|
WATERDOG
Gemini
HDF Silver Supporter
Don't Bother Me, I'm in Havi
MENIFEE, CA
Posts: 10,292
APPD 1.60
Post Rank: 8
ELIMINATOR EAGLE
|
|
Posted: Mar. 29 2008,1:03 pm |
Post # 14 |
|
| Quote (tonedog @ Mar. 29 2008,12:20 pm) | | Quote (WATERDOG @ Mar. 29 2008,11:23 am) | | Quote (shueman @ Mar. 29 2008,10:51 am) | | A lot of the decision rests with your home waters and primary usage... |
Isn't that more than true. Even in Havi with the worlds deepest dam, there's prop eaters everywhere. |
No kidding, I have a friend that customized his prop right under the bridge in the channel. Â I think it was by the second or third arch from the island side. He wasn't really happy about it, either. Â  |
You ever go to West Marine there. The biggest section in the store by far is the prop section. I think this year I'm going to carry a spare, just in case.
"Damn you sure know how to fock things up."-GFR
|
| Back to top |
|
| Member # 2868 | Joined: 4-23-2007 | |
|
|
tonedog
Aries
Boat Racer
Lake Havasu City
Posts: 800
APPD 0.13
Post Rank: 46
Between boats right now.
|
|
Posted: Mar. 29 2008,1:26 pm |
Post # 15 |
|
| Quote (WATERDOG @ Mar. 29 2008,1:03 pm) | | Quote (tonedog @ Mar. 29 2008,12:20 pm) | | Quote (WATERDOG @ Mar. 29 2008,11:23 am) | | Quote (shueman @ Mar. 29 2008,10:51 am) | | A lot of the decision rests with your home waters and primary usage... |
Isn't that more than true. Even in Havi with the worlds deepest dam, there's prop eaters everywhere. |
No kidding, I have a friend that customized his prop right under the bridge in the channel. Â I think it was by the second or third arch from the island side. He wasn't really happy about it, either. Â |
You ever go to West Marine there. The biggest section in the store by far is the prop section. I think this year I'm going to carry a spare, just in case. |
Yeah, this was alittle beyond West Marine.....more like a custom 5-blade $$$$$! 
Just livin' the dream in Lake Havasu.......
www.vistadellago.info
|
| Back to top |
| |
| Member # 3197 | Joined: 11-03-2007 | |
|
|
WATERDOG
Gemini
HDF Silver Supporter
Don't Bother Me, I'm in Havi
MENIFEE, CA
Posts: 10,292
APPD 1.60
Post Rank: 8
ELIMINATOR EAGLE
|
|
Posted: Mar. 29 2008,1:37 pm |
Post # 17 |
|
| Quote (tonedog @ Mar. 29 2008,1:26 pm) | | Quote (WATERDOG @ Mar. 29 2008,1:03 pm) | | Quote (tonedog @ Mar. 29 2008,12:20 pm) | | Quote (WATERDOG @ Mar. 29 2008,11:23 am) | | Quote (shueman @ Mar. 29 2008,10:51 am) | | A lot of the decision rests with your home waters and primary usage... |
Isn't that more than true. Even in Havi with the worlds deepest dam, there's prop eaters everywhere. |
No kidding, I have a friend that customized his prop right under the bridge in the channel. Â I think it was by the second or third arch from the island side. He wasn't really happy about it, either. Â |
You ever go to West Marine there. The biggest section in the store by far is the prop section. I think this year I'm going to carry a spare, just in case. |
Yeah, this was alittle beyond West Marine.....more like a custom 5-blade $$$$$! Â |
My buddy that just got to Havi this AM, runs a 4 blade, ladded and all, at $2,000 each. He says that's cheap. I say he getting a volume discount. He went through 6 of them last year.
"Damn you sure know how to fock things up."-GFR
|
| Back to top |
|
| Member # 2868 | Joined: 4-23-2007 | |
|
|
tonedog
Aries
Boat Racer
Lake Havasu City
Posts: 800
APPD 0.13
Post Rank: 46
Between boats right now.
|
|
Posted: Mar. 29 2008,1:47 pm |
Post # 18 |
|
| Quote (WATERDOG @ Mar. 29 2008,1:37 pm) | | Quote (tonedog @ Mar. 29 2008,1:26 pm) | | Quote (WATERDOG @ Mar. 29 2008,1:03 pm) | | Quote (tonedog @ Mar. 29 2008,12:20 pm) | | Quote (WATERDOG @ Mar. 29 2008,11:23 am) | | Quote (shueman @ Mar. 29 2008,10:51 am) | | A lot of the decision rests with your home waters and primary usage... |
Isn't that more than true. Even in Havi with the worlds deepest dam, there's prop eaters everywhere. |
No kidding, I have a friend that customized his prop right under the bridge in the channel. Â I think it was by the second or third arch from the island side. He wasn't really happy about it, either. Â |
You ever go to West Marine there. The biggest section in the store by far is the prop section. I think this year I'm going to carry a spare, just in case. |
Yeah, this was alittle beyond West Marine.....more like a custom 5-blade $$$$$! Â |
My buddy that just got to Havi this AM, runs a 4 blade, ladded and all, at $2,000 each. He says that's cheap. I say he getting a volume discount. He went through 6 of them last year. |
Does he do his own customizing in the river.....or does he throw that many blades?
Just livin' the dream in Lake Havasu.......
www.vistadellago.info
|
| Back to top |
| |
| Member # 3197 | Joined: 11-03-2007 | |
|
|
WATERDOG
Gemini
HDF Silver Supporter
Don't Bother Me, I'm in Havi
MENIFEE, CA
Posts: 10,292
APPD 1.60
Post Rank: 8
ELIMINATOR EAGLE
|
|
Posted: Mar. 29 2008,2:09 pm |
Post # 19 |
|
| Quote (tonedog @ Mar. 29 2008,1:47 pm) | | Quote (WATERDOG @ Mar. 29 2008,1:37 pm) | | Quote (tonedog @ Mar. 29 2008,1:26 pm) | | Quote (WATERDOG @ Mar. 29 2008,1:03 pm) | | Quote (tonedog @ Mar. 29 2008,12:20 pm) | | Quote (WATERDOG @ Mar. 29 2008,11:23 am) | | Quote (shueman @ Mar. 29 2008,10:51 am) | | A lot of the decision rests with your home waters and primary usage... |
Isn't that more than true. Even in Havi with the worlds deepest dam, there's prop eaters everywhere. |
No kidding, I have a friend that customized his prop right under the bridge in the channel. Â I think it was by the second or third arch from the island side. He wasn't really happy about it, either. Â |
You ever go to West Marine there. The biggest section in the store by far is the prop section. I think this year I'm going to carry a spare, just in case. |
Yeah, this was alittle beyond West Marine.....more like a custom 5-blade $$$$$! Â |
My buddy that just got to Havi this AM, runs a 4 blade, ladded and all, at $2,000 each. He says that's cheap. I say he getting a volume discount. He went through 6 of them last year. |
Does he do his own customizing in the river.....or does he throw that many blades? |
Never thrown a blade, He just has a thing for rocks. I'm gonna measure the draft on his boat next time we're out. I'm guessing 4' at idle.
"Damn you sure know how to fock things up."-GFR
|
| Back to top |
|
| Member # 2868 | Joined: 4-23-2007 | |
|
|
BigDog
Not Float'n Enuff
Phoenix, AZ
Posts: 24,808
APPD 3.50
Post Rank: 3
'99 Searay 210 Sundeck
|
|
Posted: Mar. 29 2008,9:48 pm |
Post # 21 |
|
I hear that. I have small HP and will stay with a prop. I can run all ove Havi and still have to beg to kill fuel. 
Come to think of it, I have been carring my extra prop but don't have any way to change it if out on the water if I had to. Guess I better throw a wrench in the boat. 
|
| Back to top |
|
| Member # 1527 | Joined: 6-23-2005 | |
|
|
GoFastRacer
HDF Supporter
V-Driver For Life!
Big River, Ca
Posts: 62,729
APPD 7.90
Post Rank: 1
Spectra20
|
|
Posted: Mar. 31 2008,6:16 am |
Post # 25 |
|
I got a ditch pump for sale!..
|
| Back to top |
| |
| Member # 101 | Joined: 3-03-2003 | |
|
|
Please help keep HDF free. If you
enjoy this site, feel free to make a donation to keep it running. THANKS!
11-24-2024 Three Word Post.....The Next Generation.... (Rep.#19,435) from: BigDog
Engine weight to HP ratio alone puts the jets at a disadvantage. But they do make a cooler roostertail! 
