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05-09-2005, 07:51 PM
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#1
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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inboard advice needed
a mate of mine is looking to buy a 18ft searay for wakeboarding / general boating and doesn`t know weather to go for an inboard or outboard is there much difference in fuel consuption between say
3.0ltr 135hp - 4.3ltr 190hp inboard
90hp - 135hp outboard
always had outboards any other benifits for an inboard in this size boat
other than less oil
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05-09-2005, 08:28 PM
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#2
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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Outboards use more fuel than inboards but inboards are heavy and are a pain to launch and recover single handed,also inboards take up extra room in cockpit.
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PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
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05-09-2005, 09:26 PM
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#3
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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do you know how much more fuel they use is it worth worrying about
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05-09-2005, 09:39 PM
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#4
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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Quote:
Originally posted by bert
do you know how much more fuel they use is it worth worrying about
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Depends how you drive but outboard would use at least twice as much as an inboard. If you worry about fuel consumption you'd never launch your boat
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PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
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05-09-2005, 10:09 PM
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#5
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..
Join Date: Jun 2004
Posts: 1,567
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Had the 3.0L in my old "Binliner" (20') and although was perfectley capable of pulling 2 tubes or a 3 man seadoo i would opt for the 4.3 ..... (easier to throw them out.. )
either way if you stick with the inboard you would get a "very" cheap day out .........
perhaps it was running a little on the "lean" side but i never used more than 40 quid on a "long day"
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05-09-2005, 10:13 PM
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#6
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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I,ve got a 5.0 in a 192 Captiva, it uses about half the fuel of my 2.5 Efi on a typical days use, but then it is alot slower.
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06-09-2005, 07:30 AM
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#7
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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either way if you stick with the inboard you would get a "very" cheap day out .........
perhaps it was running a little on the "lean" side but i never used more than 40 quid on a "long day" [/B][/QUOTE]
went out wakeboarding on sunday 4 of us done best part of £100 in my boat
didn`t realize there was such a big difference
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06-09-2005, 09:11 AM
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#8
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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Ive just been running mine in done 5 hours and 60 gallons of fuel, ecu is set at 106 though
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PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
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10-09-2005, 09:03 AM
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#9
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Registered User
Country: UK
Location: devon
Occupation: Dinner Lady
Interests: Rocking
Boat name: Deep Purple
Boat make: Extreme 26
Engines: Yanmar
Cruising area: the world is my scollop !!
Join Date: Mar 2004
Location: devon
Posts: 181
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You will get a better wake for the wakeboarding with an inboard as the boat would be heavier ! also i find the launch and recover is easier with the inboard as the boat wont blow around the trailer in the wind
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I dont Care what you Think !!!!!
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12-09-2005, 06:57 PM
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#10
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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Quote:
Originally posted by Foolish
Had the 3.0L in my old "Binliner" (20') and although was perfectley capable of pulling 2 tubes or a 3 man seadoo i would opt for the 4.3 ..... (easier to throw them out.. )
either way if you stick with the inboard you would get a "very" cheap day out .........
perhaps it was running a little on the "lean" side but i never used more than 40 quid on a "long day"
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just borrowed a 19 foot bayliner 3.0l with cuddy whats sort of top end did you get reckon we were only doing about 35mph thought it would go quicker than that was abit sluggish
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12-09-2005, 07:21 PM
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#11
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally posted by bert
just borrowed a 19 foot bayliner 3.0l with cuddy
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Oh Bollix! did anyone see you?
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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12-09-2005, 07:49 PM
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#12
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..
Join Date: Jun 2004
Posts: 1,567
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Quote:
just borrowed a 19 foot bayliner 3.0l with cuddy whats sort of top end did you get reckon we were only doing about 35mph thought it would go quicker than that was abit sluggish
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fully trimmed in would only rev to about 32-3400 rpm which equalled about 32-35
although if you played with the trim you could get it to the redline (4600) ..... "just before you head skywards" and a speed of 45 (ish )
anyways it's sold now and i deffinatley "won't" be buying the 3 litre again
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12-09-2005, 09:29 PM
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#13
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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Quote:
Originally posted by Jon Fuller
Oh Bollix! did anyone see you?
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i did hide at first but it was a laugh never been in anything like that before wasn`t what i expected
a mate of mine borrowed it for the weekend to go wakeboarding £40 a day bloody marvellous
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12-09-2005, 09:34 PM
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#14
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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we did try and trim it out but rev counter and speedo weren`t working properly so might have been going a little faster was definitly reving to the full though thought it was going to blow up
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13-09-2005, 05:06 PM
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#15
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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is there any type of formula to work out what sort of power inboard vs outboard to get same sort of performance
ie what hp inboard would you put in a p21 to make it do 70mph
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13-09-2005, 05:21 PM
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#16
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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I would guess at 300hp, but a P21 is a bit narrow for the weight of a 300hp V8.
one of Cookees Mazda wankel turbos would be a nice way to go.
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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13-09-2005, 05:26 PM
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#17
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Theres a company my brother & I have been looking into that are doing wankels. I think they're called 'Harmony-Marine' or sommink.
I shall look again tonight
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13-09-2005, 07:21 PM
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#18
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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Quote:
Originally posted by Jon Fuller
I would guess at 300hp, but a P21 is a bit narrow for the weight of a 300hp V8.
one of Cookees Mazda wankel turbos would be a nice way to go.
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formula about - 35%
not going to do it to a p21 but alot of these type of boat searay bayliner etc have a 3.0ltr 130hp which i thought was gutless was alright bottom end pull away but not alot top end
if my mate decides on a inboard to save on fuel would advise at least 4.3ltr 190hp i don`t want to be waiting for him every where we go but then would the fuel consumption still be better than say a 115hp outboard probably be about the same performance
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13-09-2005, 08:56 PM
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#19
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..
Join Date: Jun 2004
Posts: 1,567
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Quote:
if my mate decides on a inboard to save on fuel would advise at least 4.3ltr 190hp
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if he's gonna go to 6 pots why not go whole way and get "8" ! ....the bigger the better
after all if it's gonna be a dayboat and you want to go fast.. your wallet cannot be as tight as a "herrings arseho*e at forty fathoms" ....
failing that a few 5 gallon drums /
3 meters of garden hose / and a strong "SUCK" at a local tesco's or sainsburys C.P. the night before might help
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13-09-2005, 09:11 PM
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#20
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Registered User
Country: uk
Location: southampton
Interests: boating
Boat make: extreme 24
Engines: 8.2 volvo
Cruising area: solent
Join Date: Jul 2004
Location: southampton
Posts: 255
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Quote:
Originally posted by Foolish
failing that a few 5 gallon drums /
3 meters of garden hose / and a strong "SUCK" at a local tesco's or sainsburys C.P. the night before might help
[/B]
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might have to do that the weekend if the fuel strike gets out of hand
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