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HAVASU DCB
07-24-2002, 10:09 AM
My 18' Spectra gets shitty mileage. I can go from bluewater up to the dam and by the time I am at the no wake zone back at bluewater I am out of gas. Its a 20 gallon tank. Is this right?normal?
just a bbc,berk.

RiverDave2
07-24-2002, 10:19 AM
Is that at cruising speeds or Wide open?
20 gallons is an awful small tank for a big block.
The fuel economy sounds bad, but it doesn't sound that far off for a jet. Some of the jet guys are better suited to answering this then I am.
If I were you I'd look into installing two 30 gallon saddle tanks.
For anyone that doesn't know that can help HavasuDCB it's approximately 20-22 miles round trip.
RD

Erik
07-24-2002, 10:31 AM
If the trip is only 20-22 mi. round trip, I'd day that you are right in thinking that your not getting the gas milage that you should. I have a 19 Hallett with at BBC & Berk jet, and if I run that distance I would expect to be down a third to half a tank by then & I also hold 20 gal. Thats assuming I only run in the 3000-3500 RPM range.

rivercrazy
07-24-2002, 10:43 AM
My 21 daycruiser with a 454mag gets about 2.5 - 3 mpg at 3400rpm. Since the strip is about 20 miles for round trip your getting a 1mpg. Sounds low unless your running a very hot motor, cruisin at high rpms, or somethings amiss

HBjet
07-24-2002, 12:11 PM
Is your fuel gauge working properly?
I have 2 (10) gallon tanks, and I run dual carbs. I can run up and then down the river a 3500rpm and I still have a few gallons left.
HBjet

Boatcop
07-24-2002, 12:29 PM
It all depends on how you run, what engine/carb set up you have, pump output, jet-o-vator use, etc.
Boats fuel consumption is measured moe in Gallons Per Hour (GPH), than MPG.
Most big-block jets get around 8-10 GPH at normal cruising, maybe as high as 13-15 GPH at WOT.
When I ran an 18' Spectra (454+30 thou over, Holley 800, L88 manifold, Berkely Jet) we'd have to fill up the 20 gal tank about every 2-3 hours while patrolling the Strip, but that included a lot of idleing time.
Your situation doesn't sound too far off base.

78Eliminator
07-24-2002, 12:38 PM
HBjet:
Is your fuel gauge working properly?
I have 2 (10) gallon tanks, and I run dual carbs. I can run up and then down the river a 3500rpm and I still have a few gallons left.
HBjetWhat!? You mean I am only going to be able to run my sled up to the dam and back before having to refill???? Ouch$$$$$$$$$$

Skaterfast
07-24-2002, 12:42 PM
Bolt an outboard on there and you'll get better gas mileage on less horsepower while going a lot faster.HA HA.

HAVASU DCB
07-24-2002, 01:09 PM
It is a 454/90 thou over. 750 holley, "A" impeller just thebasics no diverter. And I need a paint job in anyone knows anybody. Thanks for all the info!
RD2 when are we doing the Navigator?

RiverDave2
07-24-2002, 03:29 PM
Pretty soon.. I'm buying a boat in a couple of weeks here so right now all of my money is going towards that.
When are we going to the river?
RD
[ July 24, 2002, 04:30 PM: Message edited by: RiverDave2 ]

Havasu Hangin'
07-24-2002, 03:34 PM
Hey HAVASU DCB- are you offering up "good ole boy" discounts on Gibson exhausts?

gigamurph
07-24-2002, 04:07 PM
Skaterfast:
Bolt an outboard on there and you'll get better gas mileage on less horsepower while going a lot faster.HA HA.Hee, hee, hee. Ain't it the truth? :p

gigamurph
07-24-2002, 04:19 PM
RiverDave2:
Pretty soon.. I'm buying a boat in a couple of weeks here so right now all of my money is going towards that.
When are we going to the river?
RDDude! I musta been outta da loop longer than I thought! What kinda boat are ya gettin' RD? :cool: ...and when did ya move back to Irvine? wink

Steamin' Rice
07-25-2002, 08:27 AM
RiverDave2:
Pretty soon.. I'm buying a boat in a couple of weeks here so right now all of my money is going towards that.
When are we going to the river?
RDDid anybody else catch this?? What are you buiying?? A 22' Nordic or something else?? Just curious

RiverDave2
07-25-2002, 10:22 AM
Just an old daycruiser.
RD