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Waterthunder

Waterthunder

Well-known member
Hey guy’s I need some help here and please answer honestly I really need some good info. Can you guy’s give me some fuel consumption numbers in gallons for a one hour period of average running in your boat. I need some fuel consumption numbers for 540's, 520's, 470's, 180's ,160's 220's ground powers and car motors under 400 cubic inches all boats must be under 14 feet and be able to haul three people. Oh ya I need to know what prop and gearbox ratios you run too. I have came across something that the physics of it just don’t make since but the numbers don’t lie.I have been playing with some custom cam grinds and chamber mod’s and have almost cut fuel consumption in half with a small block chevy. I would greatly appreciate any accurate info.

Thank you for your help,
Waterthunder
 
My dads 10'6" fulldeck, 470 gpu with dual mags and a 500 holley with 3 people on it will burn about 5-5.5 gal. per hr. at about a 1600-1800 rpm cruise. This is with a 70" powershift signature. My 250 inline six chevy on a 11' palm beach used to burn about 9 gal. per hr. with 3 people on it with a 64x30 narrow wood prop at a 2500-2700 cruise, and now goes through 6 gal per hour with a 66x34 narrow wood prop at 1900-2100 rpm cruise.

Larry
 
I run a 13x8 apache which is heavy. Angle valve 0540 with 3 blade sensinich. Aprox 6-8 gallons per hour.
 
I run a briggs 31hp with a 60 x 24 and I burn 1 gal an hour. Of course I can't go on dry run like you but I cruse at 25 - 27 mph.
 
Kline 13 3/4 deck with angle valve 0-540, with Powershift 2 bladed Signature series. Cruise is about 1850-2050 with 3 medium (175-190 weight range) people and burns about 7.0 to 8.5 gallons per hour, depending on depth.

There is a 13 foot air gator I run with, open hull with a parallel 0-540 and 3 blade narrow sensenich. Cruise is about 1600-1750 with 3 people and it burns between 5.5 and 7.0 gallons.

But that is with us slow pokes driving. We are not in a hurry very often.

Hope it helps, I am curious.
 
12.5' glass, e185 w/O520 jugs, 6 blade warp drive around 15-1600 rpm cruising around 25-30 mph best estimate +or- 7 gph.
 
Cracker,
Thanx agn for good stuff but didn't find the Calculator Westech mentioned abt using. Did you see it or must one be a member to use it?

Pat,
Not in a hurry very often :D

Thanx Thunder

Cmon AutoEngine folks,

Thanx, Gben
 
I have a 302 Ford , on a 12ft laser 72X36 stick prop.
Diret drive , it is a 2 seater but I'm 350lb then my wife
isn't but 130. I use 4.5to5 gph
 
ON my old 12 fiber glass I burned around 3 gph with a 350 and a 2.12 to 1 rotator and a 80 6 blade turbo warp drive at 10 and 12 degrees my new 14 ft I run same set up and is 2.5 to 3 gph both is with only 2 people and 30 gallons of fuel turning avrage of 32-34 hundred rpm at crusing speed
 
I am running a 12 ft. Gilileo hull with a 180 hp 0-360 and 70-32 wideblade Florida Airboat Prop. My fuel consumption at cruising ranges from 4 gph with a light load to 6 gph with 3 average sized people.
 
It’s pretty neat that just about every ride boat combination from a 180 Lycoming to a 350 Small block Chevy averages 6 to 7 GPH. Thanks a lot guy’s I appreciate the info. I’m trying to build a car motor boat that planes out and cruises around 2,000RPM and consumes around 5GPH on an average ride. I guess the winds of change are now howling enough that 90 DB at 50feet will be the next goal. I’m trying to keep my new boat as quiet as possible so my neighbor will stop video taping and pointing guns at me. I’m keeping my blade RPM very low and that really helps quiet things down along with a new muffler package idea I have came up with.
 
I'm new to the scene but my boat burned 6 gal the other day for an hour's time with me in a 13' diamondback and a 540 straight valve with a 3 blade sensitech prop.
 
Hey Thunder, irun a 305 chevy stroked with 350 crank, holley 670, 202 heads, edelbrock performer rpm intake, crane cam and double timing set, 40 over flat tops, 72x38 stick prop, direct drive for now. Don't run over 2900, so I don't really use all the motor. Planned on a belt box but ran short on funds. Planes quick for a 14' boat, aluminum, cruise at 1800 or so depending on the load, use about 6 gph depending on water depth. I use Summit's turbo mufs, 2.5x 2.5, with 2.5" flex. runs pretty quiet, you can actually talk over the motor on plane. Hope this helps.
 
That’s odd a 350 Small Block Chevy has the same stroke as a 305 they both have a 3.48 stroke however the 350 utilizes a 4 inch bore and a 305 has a 3.736 bore. Here are the common SBC engine stokes a 283 has a 3.00 stroke a 327 is 3.25, a 350, 305 and 267 are all 3.48 and a 400 is 3.75. I have tried about every combo there is including a 283 crank in a 400 block making a 320 inch motor we twisted the gut's out of that motor. In small block Chevy's there are also 3 different main journal diameters and two different rod journal diameters. It’s weird I can retain all this info but I can remember my wife’s birthday.
 
Waterthunder,
I have a 14X7.5 Diamondback with 350 ZZ4 and 2:1 belt 80" PS Power +
@3400 with 3 people I burn approx. 5 gph. Hope this helps.
 
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